Select different State:
Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming| Crystal Springs Golf Club Post Office (historical) | Crystal Springs Golf Club Post Office (historical) | Des Moines | 673 | Burlington |
| Waupeton Post Office (historical) | Waupeton Post Office (historical) | Dubuque | 630 | Cassville |
| Lester Post Office (historical) | Lester Post Office (historical) | Black Hawk | 981 | Dunkerton |
| Blackeville Post Office (historical) | Blackeville Post Office (historical) | Black Hawk | 991 | Dunkerton |
| The Willow Patch Post Office (historical) | The Willow Patch Post Office (historical) | Des Moines | 525 | Burlington |
| Burris City Post Office (historical) | Burris City Post Office (historical) | Louisa | 538 | Toolesboro |
| Jollyville Post Office (historical) | Jollyville Post Office (historical) | Lee | 659 | Dallas City |
| Browning Post Office (historical) | Browning Post Office (historical) | Carroll | 1138 | Carroll NE |
| Moorhead Post Office (historical) | Moorhead Post Office (historical) | Monona | 1122 | Moorhead |
| Soldier Post Office (historical) | Soldier Post Office (historical) | Monona | 1175 | Moorhead |
| Belvidere Post Office (historical) | Belvidere Post Office (historical) | Monona | 1201 | Moorhead NW |
| Blenco Post Office (historical) | Blenco Post Office (historical) | Monona | 1040 | Blencoe |
| Saint Clair Post Office (historical) | Saint Clair Post Office (historical) | Monona | 1197 | Ute |
| Arcola Post Office (historical) | Arcola Post Office (historical) | Monona | 1411 | Kingsley NW |
| Ticonic Post Office (historical) | Ticonic Post Office (historical) | Monona | 1073 | Smithland |
| Grant Center Post Office (historical) | Grant Center Post Office (historical) | Monona | 1056 | Smithland |
| Maxfield Post Office (historical) | Maxfield Post Office (historical) | Bremer | 1014 | Denver |
| Grove Hill Post Office (historical) | Grove Hill Post Office (historical) | Bremer | 988 | Readlyn |
| Nautrille Post Office (historical) | Nautrille Post Office (historical) | Black Hawk | 955 | Denver |
| Oran Post Office (historical) | Oran Post Office (historical) | Fayette | 1070 | Oelwein |
| Seaton Post Office (historical) | Seaton Post Office (historical) | Fayette | 1132 | Stanley |
| Scott Center Post Office (historical) | Scott Center Post Office (historical) | Fayette | 1184 | Stanley |
| Putnam Post Office (historical) | Putnam Post Office (historical) | Fayette | 1112 | Arlington |
| Riverview Post Office (historical) | Riverview Post Office (historical) | Lyon | 1476 | Little Rock |
| Willida Post Office (historical) | Willida Post Office (historical) | Lyon | 1453 | Little Rock |
| Ocheyedan Post Office (historical) | Ocheyedan Post Office (historical) | Osceola | 1558 | Ocheyedan |
| Austin Post Office (historical) | Austin Post Office (historical) | Dickinson | 1467 | Lake Park |
| Emmet Post Office (historical) | Emmet Post Office (historical) | Emmet | 1371 | Estherville |
| Iowa Lake Post Office (historical) | Iowa Lake Post Office (historical) | Emmet | 1237 | Armstrong |
| Swea Post Office (historical) | Swea Post Office (historical) | Kossuth | 1197 | Swea City |
| Silver Lake Post Office (historical) | Silver Lake Post Office (historical) | Worth | 1283 | Bristol |
| Little Cedar Post Office (historical) | Little Cedar Post Office (historical) | Mitchell | 1178 | Little Cedar |
| Wentworth Post Office (historical) | Wentworth Post Office (historical) | Mitchell | 1302 | McIntire |
| Clear Creek Post Office (historical) | Clear Creek Post Office (historical) | Allamakee | 669 | Waukon NW |
| French Creek Post Office (historical) | French Creek Post Office (historical) | Allamakee | 676 | Waukon NW |
| Ernest Post Office (historical) | Ernest Post Office (historical) | Lyon | 1348 | George West |
| New Bergen Post Office (historical) | New Bergen Post Office (historical) | Emmet | 1270 | Wallingford |
| Armstrong Grove Post Office (historical) | Armstrong Grove Post Office (historical) | Emmet | 1240 | Seneca |
| Seneca Post Office (historical) | Seneca Post Office (historical) | Kossuth | 1211 | Seneca |
| Benson Grove Post Office (historical) | Benson Grove Post Office (historical) | Winnebago | 1257 | Pilot Knob |
| Rock Creek Post Office (historical) | Rock Creek Post Office (historical) | Mitchell | 1175 | Osage SW |
| Cardiff Post Office (historical) | Cardiff Post Office (historical) | Mitchell | 1168 | New Haven |
| Doran Post Office (historical) | Doran Post Office (historical) | Mitchell | 1257 | Riceville |
| Howard Center Post Office (historical) | Howard Center Post Office (historical) | Howard | 1224 | Cresco SW |
| Woodville Post Office (historical) | Woodville Post Office (historical) | Winneshiek | 1115 | Freeport |
| Farmers Post Office (historical) | Farmers Post Office (historical) | Sioux | 1473 | Fairview |
| Irene Post Office (historical) | Irene Post Office (historical) | Sioux | 1224 | Rock Valley |
| Royal Ridge Post Office (historical) | Royal Ridge Post Office (historical) | Sioux | 1457 | Hull |
| Summit Post Office (historical) | Summit Post Office (historical) | Clay | 1375 | Spencer |
| Freeman Post Office (historical) | Freeman Post Office (historical) | Clay | 1362 | Dickens |
| Buffalo Fork Post Office (historical) | Buffalo Fork Post Office (historical) | Kossuth | 1142 | Burt |
| Kossuth Center Post Office (historical) | Kossuth Center Post Office (historical) | Kossuth | 1148 | Burt |
| Ellington Post Office (historical) | Ellington Post Office (historical) | Hancock | 1211 | Miller |
| Stillwater Post Office (historical) | Stillwater Post Office (historical) | Mitchell | 1109 | Floyd |
| Fern Valley Post Office (historical) | Fern Valley Post Office (historical) | Palo Alto | 1175 | Cylinder |
| Annieville Post Office (historical) | Annieville Post Office (historical) | Clay | 1371 | Greenville |
| Willow Creek Post Office (historical) | Willow Creek Post Office (historical) | Clay | 1375 | Royal |
| Hatch Post Office (historical) | Hatch Post Office (historical) | Kossuth | 1247 | Whittemore |
| Stapleton Post Office (historical) | Stapleton Post Office (historical) | Chickasaw | 1060 | Waucoma |
| New Alba Post Office (historical) | New Alba Post Office (historical) | Winneshiek | 1142 | Waucoma |
| Eden Post Office (historical) | Eden Post Office (historical) | Fayette | 1010 | Saint Lucas |
| Erie Post Office (historical) | Erie Post Office (historical) | O'Brien | 1457 | Sutherland West |
| Douglas Centre Post Office (historical) | Douglas Centre Post Office (historical) | Clay | 1371 | Sioux Rapids |
| Lunni Post Office (historical) | Lunni Post Office (historical) | Wright | 1112 | Renwick |
| Coldwater Post Office (historical) | Coldwater Post Office (historical) | Franklin | 1086 | Dougherty |
| Ingham Post Office (historical) | Ingham Post Office (historical) | Franklin | 1086 | Dougherty |
| Poplar Grove Post Office (historical) | Poplar Grove Post Office (historical) | Palo Alto | 1171 | Plover |
| West Bend Post Office | West Bend Post Office | Palo Alto | 1191 | West Bend |
| Mentor Post Office (historical) | Mentor Post Office (historical) | Bremer | 1086 | Fredericksburg |
| Bethel Post Office (historical) | Bethel Post Office (historical) | Fayette | 1033 | Alpha |
| Windsor Post Office (historical) | Windsor Post Office (historical) | Fayette | 1132 | Hawkeye |
| Illyria Post Office (historical) | Illyria Post Office (historical) | Fayette | 1168 | Elgin |
| Gem Post Office (historical) | Gem Post Office (historical) | Clayton | 1010 | Gunder |
| Bismark Post Office (historical) | Bismark Post Office (historical) | Clayton | 958 | Farmersburg |
| Menoti Post Office (historical) | Menoti Post Office (historical) | Buena Vista | 1289 | Sioux Rapids SE |
| Wacousta Post Office (historical) | Wacousta Post Office (historical) | Humboldt | 1158 | Bradgate |
| Park Grove Post Office (historical) | Park Grove Post Office (historical) | Humboldt | 1197 | Bradgate |
| Randolph Post Office (historical) | Randolph Post Office (historical) | Humboldt | 1142 | Livermore |
| Lotts Creek Post Office (historical) | Lotts Creek Post Office (historical) | Humboldt | 1122 | Livermore |
| Von Post Office (historical) | Von Post Office (historical) | Humboldt | 1152 | Livermore |
| Viona Post Office (historical) | Viona Post Office (historical) | Humboldt | 1161 | Hardy |
| Union Ridge Post Office (historical) | Union Ridge Post Office (historical) | Butler | 1145 | Kanawha SE |
| Menzie Post Office (historical) | Menzie Post Office (historical) | Franklin | 1093 | Hansell |
| Dayton Post Office (historical) | Dayton Post Office (historical) | Bremer | 1056 | Sumner SW |
| Buckcreek Post Office (historical) | Buckcreek Post Office (historical) | Bremer | 1047 | Sumner SW |
| Cox Creek Post Office (historical) | Cox Creek Post Office (historical) | Clayton | 810 | Elkader |
| Rosbach Post Office (historical) | Rosbach Post Office (historical) | Plymouth | 1381 | Hinton |
| Pilot Rock Post Office (historical) | Pilot Rock Post Office (historical) | Cherokee | 1155 | Cherokee South |
| Fryeburgh Post Office (historical) | Fryeburgh Post Office (historical) | Wright | 1204 | Dows West |
| Congress Post Office (historical) | Congress Post Office (historical) | Franklin | 1207 | Coulter |
| Swanton Post Office (historical) | Swanton Post Office (historical) | Butler | 915 | Coster |
| Mill Post Office (historical) | Mill Post Office (historical) | Fayette | 1099 | Sumner |
| Rock Run Post Office (historical) | Rock Run Post Office (historical) | Shelby | 1191 | Persia |
| Shelby Post Office (historical) | Shelby Post Office (historical) | Shelby | 1467 | Earling |
| Blue Point Post Office (historical) | Blue Point Post Office (historical) | Poweshiek | 971 | Grinnell South |
| Sherman Post Office (historical) | Sherman Post Office (historical) | Poweshiek | 856 | Montezuma |
| Tyro Post Office (historical) | Tyro Post Office (historical) | Poweshiek | 919 | Searsboro |
| Mill Grove Post Office (historical) | Mill Grove Post Office (historical) | Poweshiek | 791 | Searsboro |
| Danforth Post Office (historical) | Danforth Post Office (historical) | Johnson | 820 | Amana |
| Unity Post Office (historical) | Unity Post Office (historical) | Johnson | 725 | Tiffin |
| Shoo Fly Post Office (historical) | Shoo Fly Post Office (historical) | Johnson | 653 | Lone Tree |
| Watson Station Post Office (historical) | Watson Station Post Office (historical) | Jasper | 791 | Colfax |
| Germanville Post Office (historical) | Germanville Post Office (historical) | Jefferson | 692 | Salina |
| Yazoo Post Office (historical) | Yazoo Post Office (historical) | Harrison | 1007 | Modale |
| Tipton Grove Post Office (historical) | Tipton Grove Post Office (historical) | Hardin | 1040 | Hubbard |
| Advance Post Office (historical) | Advance Post Office (historical) | Guthrie | 1066 | Yale |
| Dodge Post Office (historical) | Dodge Post Office (historical) | Guthrie | 1227 | Bayard |
| Greenvale Post Office (historical) | Greenvale Post Office (historical) | Dallas | 1056 | Adel NW |
| Nordyke Post Office (historical) | Nordyke Post Office (historical) | Dallas | 955 | Commerce |
| Snyder Post Office (historical) | Snyder Post Office (historical) | Dallas | 1010 | Granger |
| Gillett Grove Post Office | Gillett Grove Post Office | Clay | 1309 | Gillett Grove |
| Rock Post Office (historical) | Rock Post Office (historical) | Hancock | 1227 | Clear Lake East |
| Red Oak Post Office (historical) | Red Oak Post Office (historical) | Cedar | 856 | Tipton West |
| Pleasant Hill Post Office (historical) | Pleasant Hill Post Office (historical) | Cedar | 781 | Lime City |
| Hull Post Office (historical) | Hull Post Office (historical) | Boone | 1102 | Luther |
| Vaughn Post Office (historical) | Vaughn Post Office (historical) | Fremont | 958 | Shenandoah West |
| Deer Creek Post Office (historical) | Deer Creek Post Office (historical) | Fremont | 991 | Randolph |
| High Creek Post Office (historical) | High Creek Post Office (historical) | Fremont | 1060 | Farmers City |
| Nodaway Mills Post Office (historical) | Nodaway Mills Post Office (historical) | Page | 978 | Clarinda South |
| Tarkio Post Office (historical) | Tarkio Post Office (historical) | Page | 1122 | Coin |
| Walkerville Post Office (historical) | Walkerville Post Office (historical) | Page | 988 | Farmers City |
| Union Grove Post Office (historical) | Union Grove Post Office (historical) | Page | 1083 | Westboro |
| Dan Post Office (historical) | Dan Post Office (historical) | Taylor | 1263 | Gravity |
| Gravity Post Office (historical) | Gravity Post Office (historical) | Taylor | 1266 | Guss |
| Holt Post Office (historical) | Holt Post Office (historical) | Taylor | 1240 | Guss |
| Memory Post Office (historical) | Memory Post Office (historical) | Taylor | 1109 | New Market |
| Union Hill Post Office (historical) | Union Hill Post Office (historical) | Ringgold | 1148 | Ellston |
| Eugene Post Office (historical) | Eugene Post Office (historical) | Ringgold | 1247 | Tingley |
| Marena Post Office (historical) | Marena Post Office (historical) | Ringgold | 1165 | Clearfield |
| Cross Post Office (historical) | Cross Post Office (historical) | Ringgold | 1161 | Kellerton |
| Redding Post Office | Redding Post Office | Ringgold | 1152 | Blockton |
| Bozzaris Post Office (historical) | Bozzaris Post Office (historical) | Ringgold | 1027 | Blockton |
| Clipper Post Office (historical) | Clipper Post Office (historical) | Ringgold | 1083 | Blockton SE |
| Genoa Post Office (historical) | Genoa Post Office (historical) | Wayne | 1079 | Lake Thunderhead |
| Livingston Post Office (historical) | Livingston Post Office (historical) | Appanoose | 1053 | Saint John |
| Stiles Post Office (historical) | Stiles Post Office (historical) | Davis | 843 | Pulaski |
| Jefferson Post Office (historical) | Jefferson Post Office (historical) | Davis | 961 | West Grove |
| Beetrace Post Office (historical) | Beetrace Post Office (historical) | Appanoose | 978 | Moulton |
| Orleans Post Office (historical) | Orleans Post Office (historical) | Appanoose | 981 | Moulton |
| Kirkwood Post Office (historical) | Kirkwood Post Office (historical) | Appanoose | 853 | Centerville East |
| Bunch Post Office (historical) | Bunch Post Office (historical) | Davis | 928 | Paris |
| Dennis Post Office (historical) | Dennis Post Office (historical) | Appanoose | 906 | Hiattsville |
| Donnellson Post Office | Donnellson Post Office | Lee | 702 | Donnellson |
| Home Post Office (historical) | Home Post Office (historical) | Van Buren | 761 | Cantril |
| Oak Point Post Office (historical) | Oak Point Post Office (historical) | Van Buren | 791 | Milton |
| Huron Post Office (historical) | Huron Post Office (historical) | Des Moines | 535 | Oakville |
| Amity Post Office (historical) | Amity Post Office (historical) | Des Moines | 702 | Kingston |
| Cotton Grove Post Office (historical) | Cotton Grove Post Office (historical) | Henry | 718 | Winfield South |
| Swedesburg Post Office | Swedesburg Post Office | Henry | 735 | Swedesburg |
| Winona Post Office (historical) | Winona Post Office (historical) | Henry | 728 | Swedesburg |
| Boyleston Post Office (historical) | Boyleston Post Office (historical) | Henry | 692 | Salem |
| Wayne Post Office (historical) | Wayne Post Office (historical) | Henry | 722 | Crawfordsville |
| Merrimack Post Office (historical) | Merrimack Post Office (historical) | Jefferson | 594 | Trenton |
| Four Corners Post Office (historical) | Four Corners Post Office (historical) | Jefferson | 735 | Salina |
| Baker Post Office (historical) | Baker Post Office (historical) | Jefferson | 781 | Fairfield North |
| Vega Post Office (historical) | Vega Post Office (historical) | Jefferson | 705 | Lockridge East |
| Glendale Post Office (historical) | Glendale Post Office (historical) | Jefferson | 751 | Lockridge West |
| Competine Post Office (historical) | Competine Post Office (historical) | Wapello | 794 | Abingdon |
| Highland Center Post Office (historical) | Highland Center Post Office (historical) | Wapello | 774 | Hedrick |
| Dudley Post Office (historical) | Dudley Post Office (historical) | Wapello | 653 | Chillicothe |
| Comstock Post Office (historical) | Comstock Post Office (historical) | Wapello | 666 | Chillicothe |
| Munterville Post Office (historical) | Munterville Post Office (historical) | Wapello | 860 | Chillicothe |
| Cliffland Post Office (historical) | Cliffland Post Office (historical) | Wapello | 633 | Agency |
| Cooperville Post Office (historical) | Cooperville Post Office (historical) | Wapello | 866 | Blakesburg NE |
| Coalfield Post Office (historical) | Coalfield Post Office (historical) | Monroe | 728 | Avery |
| Coalton Post Office (historical) | Coalton Post Office (historical) | Monroe | 879 | Hiteman |
| Weller Post Office (historical) | Weller Post Office (historical) | Monroe | 965 | Weller |
| Belinda Post Office (historical) | Belinda Post Office (historical) | Lucas | 827 | Melcher-Dallas |
| Norwood Post Office (historical) | Norwood Post Office (historical) | Lucas | 1043 | Lucas |
| Grant Post Office (historical) | Grant Post Office (historical) | Montgomery | 1155 | Grant |
| Sciola Post Office (historical) | Sciola Post Office (historical) | Montgomery | 1063 | Morton Mills |
| Waveland Post Office (historical) | Waveland Post Office (historical) | Pottawattamie | 1089 | Griswold |
| Wheeler Grove Post Office (historical) | Wheeler Grove Post Office (historical) | Pottawattamie | 1171 | Carson NE |
| Macedonia Post Office (historical) | Macedonia Post Office (historical) | Pottawattamie | 1083 | Carson |
| Living Spring Post Office (historical) | Living Spring Post Office (historical) | Pottawattamie | 1089 | Treynor |
| Big Grove Post Office (historical) | Big Grove Post Office (historical) | Pottawattamie | 1096 | Oakland |
| Parna Post Office (historical) | Parna Post Office (historical) | Pottawattamie | 1175 | Oakland |
| Downsville Post Office (historical) | Downsville Post Office (historical) | Pottawattamie | 1050 | McClelland |
| Taylor Station Post Office (historical) | Taylor Station Post Office (historical) | Pottawattamie | 1184 | Taylor |
| Whitneyville Post Office (historical) | Whitneyville Post Office (historical) | Cass | Unknown | |
| Newlons Grove Post Office (historical) | Newlons Grove Post Office (historical) | Cass | 1207 | Grant |
| Holadays Post Office (historical) | Holadays Post Office (historical) | Adair | 1171 | Rosserdale |
| Canby Post Office (historical) | Canby Post Office (historical) | Adair | 1355 | Canby |
| Arbor Hill Post Office (historical) | Arbor Hill Post Office (historical) | Adair | 1237 | Arbor Hill |
| Groveland Post Office (historical) | Groveland Post Office (historical) | Adair | 1362 | Greenfield |
| Jackson Post Office (historical) | Jackson Post Office (historical) | Adair | 1329 | Fontanelle SW |
| Vino Post Office (historical) | Vino Post Office (historical) | Adair | 1309 | Orient |
| Orient Post Office | Orient Post Office | Adair | 1345 | Unknown |
| Fisk Post Office (historical) | Fisk Post Office (historical) | Adair | 1329 | Nevinville |
| North River Post Office (historical) | North River Post Office (historical) | Madison | 1119 | Earlham West |
| Middle River Post Office (historical) | Middle River Post Office (historical) | Madison | 1102 | Pitzer |
| Maple Grove Post Office (historical) | Maple Grove Post Office (historical) | Madison | 1194 | Pitzer |
| Ohio Post Office (historical) | Ohio Post Office (historical) | Madison | 1125 | East Peru |
| Wells Post Office (historical) | Wells Post Office (historical) | Madison | 1191 | Macksburg |
| Rosemont Post Office (historical) | Rosemont Post Office (historical) | Warren | 869 | Newbern |
| Lawrenceburg Post Office (historical) | Lawrenceburg Post Office (historical) | Warren | 889 | Medora |
| Sharon Post Office (historical) | Sharon Post Office (historical) | Warren | 981 | Medora |
| Schonberg Post Office (historical) | Schonberg Post Office (historical) | Warren | 961 | Milo |
| Lynn Post Office (historical) | Lynn Post Office (historical) | Warren | 971 | Norwalk |
| New Chicago Post Office (historical) | New Chicago Post Office (historical) | Marion | 794 | Newbern |
| Iola Post Office (historical) | Iola Post Office (historical) | Marion | 804 | Harvey |
| Amsterdam Post Office (historical) | Amsterdam Post Office (historical) | Marion | 712 | Harvey |
| Lucas Grove Post Office (historical) | Lucas Grove Post Office (historical) | Marion | 827 | Knoxville NW |
| Star Post Office (historical) | Star Post Office (historical) | Marion | 879 | Beech |
| Rousseau Post Office (historical) | Rousseau Post Office (historical) | Marion | 741 | Otley |
| Oak Post Office (historical) | Oak Post Office (historical) | Marion | 810 | Knoxville NW |
| Bennington Post Office (historical) | Bennington Post Office (historical) | Marion | 820 | Pleasantville |
| Eveland Grove Post Office (historical) | Eveland Grove Post Office (historical) | Mahaska | 817 | Buxton |
| Ferry Post Office (historical) | Ferry Post Office (historical) | Mahaska | 738 | Buxton |
| White Oak Post Office (historical) | White Oak Post Office (historical) | Mahaska | 830 | Rose Hill |
| Hopewell Post Office (historical) | Hopewell Post Office (historical) | Mahaska | 709 | Rose Hill |
| Munchuk Post Office (historical) | Munchuk Post Office (historical) | Mahaska | 820 | Union Mills |
| Buckhorn Post Office (historical) | Buckhorn Post Office (historical) | Mahaska | 804 | Union Mills |
| Flint Post Office (historical) | Flint Post Office (historical) | Mahaska | 873 | Peoria |
| Creswell Post Office (historical) | Creswell Post Office (historical) | Keokuk | 801 | South English |
| Chandler Post Office (historical) | Chandler Post Office (historical) | Keokuk | 807 | Kinross |
| Manhatten Post Office (historical) | Manhatten Post Office (historical) | Keokuk | 699 | Ollie |
| Walden Post Office (historical) | Walden Post Office (historical) | Keokuk | 794 | Pekin |
| Butler Post Office (historical) | Butler Post Office (historical) | Keokuk | 827 | Hedrick |
| Dairy Post Office (historical) | Dairy Post Office (historical) | Washington | 738 | Riverside |
| Valley Post Office (historical) | Valley Post Office (historical) | Washington | 696 | Keota |
| Dublin Dutch Creek Post Office (historical) | Dublin Dutch Creek Post Office (historical) | Washington | 771 | West Chester |
| Clay Post Office (historical) | Clay Post Office (historical) | Washington | 682 | Richland |
| Aurora Post Office (historical) | Aurora Post Office (historical) | Keokuk | 846 | What Cheer |
| White Pigeon Post Office (historical) | White Pigeon Post Office (historical) | Keokuk | 863 | Keswick |
| Hinkleville Foot Post Office (historical) | Hinkleville Foot Post Office (historical) | Keokuk | 758 | Holbrook |
| Middleburg Post Office (historical) | Middleburg Post Office (historical) | Washington | 738 | Kalona |
| Twin Oak Post Office (historical) | Twin Oak Post Office (historical) | Louisa | 653 | Cotter |
| Melpine Post Office (historical) | Melpine Post Office (historical) | Muscatine | 696 | Durant |
| Sweetland Centre Post Office (historical) | Sweetland Centre Post Office (historical) | Muscatine | 755 | Illinois City |
| Walnut Grove Post Office (historical) | Walnut Grove Post Office (historical) | Scott | 696 | Eldridge |
| Amity Post Office (historical) | Amity Post Office (historical) | Scott | 735 | Donahue |
| Allens Grove Post Office (historical) | Allens Grove Post Office (historical) | Scott | 755 | Donahue |
| Donahue Station Post Office (historical) | Donahue Station Post Office (historical) | Scott | 718 | Donahue |
| Plain View Post Office (historical) | Plain View Post Office (historical) | Scott | 745 | Dixon |
| Mount Joy Post Office (historical) | Mount Joy Post Office (historical) | Scott | 738 | Davenport East |
| Round Grove Post Office (historical) | Round Grove Post Office (historical) | Scott | 778 | Dixon |
| Orange Post Office (historical) | Orange Post Office (historical) | Clinton | 686 | Grand Mound |
| Temple Hill Post Office (historical) | Temple Hill Post Office (historical) | Jones | 978 | Canton |
| Walters Mill Post Office (historical) | Walters Mill Post Office (historical) | Jones | 906 | Canton |
| Clayford Post Office (historical) | Clayford Post Office (historical) | Jones | 758 | Canton |
| Toddville Post Office (historical) | Toddville Post Office (historical) | Linn | 768 | Cedar Rapids North |
| Buffalo Grove Post Office (historical) | Buffalo Grove Post Office (historical) | Buchanan | 1073 | Lamont |
| Castleville Post Office (historical) | Castleville Post Office (historical) | Buchanan | 1050 | Lamont |
| Wards Corners Post Office (historical) | Wards Corners Post Office (historical) | Buchanan | 1066 | Lamont |
| Vineyard Post Office (historical) | Vineyard Post Office (historical) | Tama | 984 | Garwin |
| Castle Grove Post Office (historical) | Castle Grove Post Office (historical) | Jones | 935 | Anamosa NE |
| Flemingville Post Office (historical) | Flemingville Post Office (historical) | Linn | 886 | Prairieburg |
| West Prairie Post Office (historical) | West Prairie Post Office (historical) | Linn | 945 | Lafayette |
| La Fayette Post Office (historical) | La Fayette Post Office (historical) | Linn | 856 | Lafayette |
| Spencers Grove Post Office (historical) | Spencers Grove Post Office (historical) | Benton | 925 | Walker |
| Burke Post Office (historical) | Burke Post Office (historical) | Benton | 820 | Cheney |
| Robin Post Office (historical) | Robin Post Office (historical) | Benton | 876 | Fairfax |
| Paul Post Office (historical) | Paul Post Office (historical) | Benton | 935 | Elberon |
| Dryden Post Office (historical) | Dryden Post Office (historical) | Tama | 938 | Elberon |
| Evergreen Post Office (historical) | Evergreen Post Office (historical) | Tama | 909 | Dysart |
| Buckingham Post Office (historical) | Buckingham Post Office (historical) | Tama | 938 | Traer |
| Spring Creek Post Office (historical) | Spring Creek Post Office (historical) | Tama | 978 | Gladbrook |
| Badger Hill Post Office (historical) | Badger Hill Post Office (historical) | Tama | 968 | Gladbrook |
| Helena Post Office (historical) | Helena Post Office (historical) | Tama | 794 | Chelsea |
| Northville Post Office (historical) | Northville Post Office (historical) | Greene | 1112 | Wightman |
| Timber Creek Post Office (historical) | Timber Creek Post Office (historical) | Marshall | 997 | Laurel |
| Green Mountain Post Office (historical) | Green Mountain Post Office (historical) | Tama | 981 | Le Grand |
| Vienna Post Office (historical) | Vienna Post Office (historical) | Madison | 1033 | Conrad East |
| Minerva Post Office (historical) | Minerva Post Office (historical) | Marshall | 948 | State Center |
| Stanford Post Office (historical) | Stanford Post Office (historical) | Marshall | 994 | Union |
| Grove Post Office (historical) | Grove Post Office (historical) | Marshall | 971 | State Center NW |
| Illinois Grove Post Office (historical) | Illinois Grove Post Office (historical) | Marshall | 1056 | State Center NW |
| Roland Post Office (historical) | Roland Post Office (historical) | Story | 1010 | Story City |
| Willow Grove Post Office (historical) | Willow Grove Post Office (historical) | Story | 994 | Story City |
| P L Post Office (historical) | P L Post Office (historical) | Story | 974 | Ames West |
| Palestine Post Office (historical) | Palestine Post Office (historical) | Story | 971 | Huxley |
| Elba Post Office (historical) | Elba Post Office (historical) | Carroll | 1414 | Templeton |
| Empire Post Office (historical) | Empire Post Office (historical) | Wright | 1243 | Clarion |
| Oakland Post Office (historical) | Oakland Post Office (historical) | Wright | 1148 | Popejoy |
| Otisville Post Office (historical) | Otisville Post Office (historical) | Wright | 1175 | Dows West |
| Eagle Grove Post Office (historical) | Eagle Grove Post Office (historical) | Wright | 1122 | Eagle Grove |
| Wool Stock Post Office (historical) | Wool Stock Post Office (historical) | Wright | 1119 | Woolstock |
| Willoughby Post Office (historical) | Willoughby Post Office (historical) | Butler | 896 | Coster |
| Ingham Post Office (historical) | Ingham Post Office (historical) | Butler | 1050 | Hansell |
| Tara Post Office (historical) | Tara Post Office (historical) | Webster | 1161 | Moorland |
| Silver Creek Post Office (historical) | Silver Creek Post Office (historical) | Ida | 1250 | Ida Grove NW |
| Waterman Post Office (historical) | Waterman Post Office (historical) | Wright | 1188 | Clarion SW |
| Ortho Post Office (historical) | Ortho Post Office (historical) | Webster | 1122 | Evanston |
| Willow Dale Post Office (historical) | Willow Dale Post Office (historical) | Ida | 1368 | Holstein |
| Bach Grove Post Office (historical) | Bach Grove Post Office (historical) | Wright | 1112 | Eagle Grove SW |
| Otisville Post Office (historical) | Otisville Post Office (historical) | Wright | 1152 | Dows West |
| Saratoga Post Office (historical) | Saratoga Post Office (historical) | Hamilton | 1089 | Woolstock |
| Polands Grove Post Office (historical) | Polands Grove Post Office (historical) | Hamilton | 1138 | Blairsburg |
| Rose Grove Post Office (historical) | Rose Grove Post Office (historical) | Hamilton | 1175 | Williams |
| Hesperia Post Office (historical) | Hesperia Post Office (historical) | Webster | 1099 | Lehigh |
| Palermo Post Office (historical) | Palermo Post Office (historical) | Grundy | 1093 | Ivester |
| Elizabeth Post Office (historical) | Elizabeth Post Office (historical) | Grundy | 932 | New Hartford |
| Lincoln Centre Post Office (historical) | Lincoln Centre Post Office (historical) | Grundy | 988 | Dike |
| Boylans Grove Post Office (historical) | Boylans Grove Post Office (historical) | Butler | 1040 | Dumont North |
| Alice Post Office (historical) | Alice Post Office (historical) | Grundy | 1043 | Ivester |
| Wadaloup Post Office (historical) | Wadaloup Post Office (historical) | Grundy | 1047 | Conrad East |
| Reinbeck Post Office (historical) | Reinbeck Post Office (historical) | Black Hawk | 928 | Reinbeck |
| Millers Creek Post Office (historical) | Millers Creek Post Office (historical) | Black Hawk | 915 | Eagle Center |
| Cedar Valley Post Office (historical) | Cedar Valley Post Office (historical) | Black Hawk | 830 | Waterloo South |
| Enterprise Post Office (historical) | Enterprise Post Office (historical) | Black Hawk | 909 | La Porte City |
| Fuller Post Office (historical) | Fuller Post Office (historical) | Mitchell | 1171 | Osage |
| Acme Post Office (historical) | Acme Post Office (historical) | Howard | 1211 | Riceville |
| Jackson School Post Office (historical) | Jackson School Post Office (historical) | Emmet | 1280 | Estherville |
| East Peru Post Office | East Peru Post Office | Madison | 965 | East Peru |
| Lost Island Post Office (historical) | Lost Island Post Office (historical) | Palo Alto | 1342 | Ruthven |
| Great Oak Post Office (historical) | Great Oak Post Office (historical) | Palo Alto | 1217 | Emmetsburg |
| Soda Bar Post Office (historical) | Soda Bar Post Office (historical) | Palo Alto | 1184 | Emmetsburg |
| Oshdosh Post Office (historical) | Oshdosh Post Office (historical) | Sioux | 1309 | Maurice |
| Patriot Post Office (historical) | Patriot Post Office (historical) | Decatur | 1161 | Van Wert |
| Franklin Post Office (historical) | Franklin Post Office (historical) | Decatur | 1102 | Garden Grove SW |
| Green Valley Post Office (historical) | Green Valley Post Office (historical) | Decatur | 1109 | Grand River |
| Sedgewick Post Office (historical) | Sedgewick Post Office (historical) | Decatur | 1122 | Lamoni South |
| Shocks Post Office (historical) | Shocks Post Office (historical) | Wapello | 643 | Chillicothe |
| Darlington Post Office (historical) | Darlington Post Office (historical) | Sioux | 1214 | Fairview |
| Elmsprings Post Office (historical) | Elmsprings Post Office (historical) | Sioux | 1214 | Fairview |
| Athol Post Office (historical) | Athol Post Office (historical) | Sioux | 1457 | Boyden |
| Calliope Post Office (historical) | Calliope Post Office (historical) | Sioux | 1184 | Hawarden North |
| Carmel Post Office (historical) | Carmel Post Office (historical) | Sioux | 1440 | Hull |
| Carnes Post Office (historical) | Carnes Post Office (historical) | Sioux | 1273 | Alton |
| Chatsworth Post Office (historical) | Chatsworth Post Office (historical) | Sioux | 1165 | Chatsworth |
| Corn Valley Post Office (historical) | Corn Valley Post Office (historical) | Sioux | 1312 | Ireton |
| May Bell Post Office (historical) | May Bell Post Office (historical) | Sioux | 1463 | Hull |
| McNally Post Office (historical) | McNally Post Office (historical) | Sioux | 1329 | Hawarden South |
| Middleburg Post Office (historical) | Middleburg Post Office (historical) | Sioux | 1401 | Orange City |
| Perkins Post Office (historical) | Perkins Post Office (historical) | Sioux | 1463 | Hull |
| Sheridan Post Office (historical) | Sheridan Post Office (historical) | Sioux | 1427 | Boyden |
| Sioux Center Post Office | Sioux Center Post Office | Sioux | 1460 | Sioux Center |
| Rock Valley Post Office | Rock Valley Post Office | Sioux | 1247 | Rock Valley |
| Orange City Post Office | Orange City Post Office | Sioux | 1440 | Orange City |
| Newkirk Post Office (historical) | Newkirk Post Office (historical) | Sioux | 1430 | Hospers |
| Maurice Post Office | Maurice Post Office | Sioux | 1319 | Maurice |
| Matlock Post Office (historical) | Matlock Post Office (historical) | Sioux | 1401 | Matlock |
| Ireton Post Office | Ireton Post Office | Sioux | 1421 | Ireton |
| Hull Post Office | Hull Post Office | Sioux | 1444 | Hull |
| Hospers Post Office | Hospers Post Office | Sioux | 1345 | Hospers |
| Hawarden Post Office | Hawarden Post Office | Sioux | 1181 | Hawarden South |
| Granville Post Office | Granville Post Office | Sioux | 1447 | Granville East |
| Boyden Post Office | Boyden Post Office | Sioux | 1424 | Boyden |
| Alton Post Office | Alton Post Office | Sioux | 1316 | Alton |
| Helgerson Post Office (historical) | Helgerson Post Office (historical) | Lyon | 1391 | Alvord |
| Upland Post Office (historical) | Upland Post Office (historical) | Lyon | 1270 | Klondike |
| Smead Post Office (historical) | Smead Post Office (historical) | Lyon | 1299 | Doon |
| Lakewood Post Office (historical) | Lakewood Post Office (historical) | Lyon | 1312 | Doon |
| Krogness Post Office (historical) | Krogness Post Office (historical) | Lyon | 1404 | Inwood |
| Klondike Post Office (historical) | Klondike Post Office (historical) | Lyon | 1293 | Klondike |
| Granite Post Office (historical) | Granite Post Office (historical) | Lyon | 1309 | Klondike |
| Gibraltar Post Office (historical) | Gibraltar Post Office (historical) | Lyon | 1362 | Klondike |
| Rock Rapids Post Office | Rock Rapids Post Office | Lyon | 1348 | Rock Rapids |
| Larchwood Post Office | Larchwood Post Office | Lyon | 1480 | Larchwood |
| Inwood Post Office | Inwood Post Office | Lyon | 1467 | Inwood |
| George Post Office | George Post Office | Lyon | 1378 | George West |
| Little Rock Post Office | Little Rock Post Office | Lyon | 1489 | Little Rock |
| Edna Post Office (historical) | Edna Post Office (historical) | Lyon | 1414 | Edna |
| Lester Post Office | Lester Post Office | Lyon | 1417 | Lester |
| Doon Post Office | Doon Post Office | Lyon | 1296 | Doon |
| Alvord Post Office | Alvord Post Office | Lyon | 1329 | Alvord |
| Beloit Post Office (historical) | Beloit Post Office (historical) | Lyon | 1243 | Canton |
| Plymouth Centre Post Office (historical) | Plymouth Centre Post Office (historical) | Plymouth | 1194 | Union Center NW |
| Ponona Post Office (historical) | Ponona Post Office (historical) | Plymouth | 1391 | Ireton SW |
| Potosia Post Office (historical) | Potosia Post Office (historical) | Plymouth | 1266 | Hinton |
| Ruble Post Office (historical) | Ruble Post Office (historical) | Plymouth | 1302 | Ireton SW |
| Struble Post Office (historical) | Struble Post Office (historical) | Plymouth | 1270 | Maurice |
| Yoemans Post Office (historical) | Yoemans Post Office (historical) | Plymouth | 1352 | Sioux City North |
| Vogt Post Office (historical) | Vogt Post Office (historical) | Plymouth | Unknown | |
| Malton Post Office (historical) | Malton Post Office (historical) | Plymouth | 1214 | Elk Point NE |
| Melbourne Post Office (historical) | Melbourne Post Office (historical) | Plymouth | 1243 | Hinton |
| Millnerville Post Office (historical) | Millnerville Post Office (historical) | Plymouth | 1178 | Millnerville |
| Neptune Post Office (historical) | Neptune Post Office (historical) | Plymouth | 1371 | Union Center NW |
| O'Leary Post Office (historical) | O'Leary Post Office (historical) | Plymouth | 1427 | Union Center |
| Broken Kettle Post Office (historical) | Broken Kettle Post Office (historical) | Plymouth | 1115 | Elk Point NE |
| Crathorne Post Office (historical) | Crathorne Post Office (historical) | Plymouth | 1417 | Brunsville |
| Dalton Post Office (historical) | Dalton Post Office (historical) | Plymouth | 1211 | Le Mars |
| Ellendale Post Office (historical) | Ellendale Post Office (historical) | Plymouth | 1417 | Hinton |
| Furay Post Office (historical) | Furay Post Office (historical) | Plymouth | 1306 | Ireton SW |
| Holley Post Office (historical) | Holley Post Office (historical) | Plymouth | 1421 | Brunsville |
| James Post Office (historical) | James Post Office (historical) | Plymouth | 1132 | James |
| Le Mars Post Office | Le Mars Post Office | Plymouth | 1220 | Le Mars |
| Seney Post Office (historical) | Seney Post Office (historical) | Plymouth | 1243 | Le Mars |
| Westfield Post Office | Westfield Post Office | Plymouth | 1135 | Akron |
| Remsen Post Office | Remsen Post Office | Plymouth | 1335 | Remsen |
| Merrill Post Office | Merrill Post Office | Plymouth | 1178 | Union Center NW |
| Kingsley Post Office | Kingsley Post Office | Plymouth | 1260 | Kingsley |
| Akron Post Office | Akron Post Office | Plymouth | 1148 | Akron |
| Oyens Post Office | Oyens Post Office | Plymouth | 1283 | Oyens |
| Hinton Post Office | Hinton Post Office | Plymouth | 1148 | Hinton |
| Craig Post Office (historical) | Craig Post Office (historical) | Plymouth | 1398 | Ireton |
| Brunsville Post Office | Brunsville Post Office | Plymouth | 1260 | Brunsville |
| Adaville Post Office (historical) | Adaville Post Office (historical) | Plymouth | 1316 | Ireton SW |
| Mammen Post Office (historical) | Mammen Post Office (historical) | Plymouth | 1401 | Brunsville |
| Waterman Post Office (historical) | Waterman Post Office (historical) | O'Brien | 1329 | Sutherland East |
| Shabbona Post Office (historical) | Shabbona Post Office (historical) | O'Brien | 1453 | Granville East |
| Romano Post Office (historical) | Romano Post Office (historical) | O'Brien | 1414 | Sutherland West |
| Philby Post Office (historical) | Philby Post Office (historical) | O'Brien | 1407 | Sheldon SE |
| O'Brien Post Office (historical) | O'Brien Post Office (historical) | O'Brien | 1388 | Sutherland East |
| Moneta Post Office (historical) | Moneta Post Office (historical) | O'Brien | 1447 | Hartley |
| Max Post Office (historical) | Max Post Office (historical) | O'Brien | 1555 | Plessis |
| Gaza Post Office (historical) | Gaza Post Office (historical) | O'Brien | 1496 | Gaza |
| Elcho Post Office (historical) | Elcho Post Office (historical) | O'Brien | 1493 | Gaza |
| Crona Post Office (historical) | Crona Post Office (historical) | O'Brien | 1496 | Gaza |
| Sheldon Post Office | Sheldon Post Office | O'Brien | 1417 | Sheldon |
| Sutherland Post Office | Sutherland Post Office | O'Brien | 1430 | Sutherland East |
| Germantown Post Office (historical) | Germantown Post Office (historical) | O'Brien | 1427 | Granville East |
| Sanborn Post Office | Sanborn Post Office | O'Brien | 1552 | Sanborn |
| Primghar Post Office | Primghar Post Office | O'Brien | 1532 | Primghar |
| Paullina Post Office | Paullina Post Office | O'Brien | 1411 | Paullina |
| Plessis Posot Office (historical) | Plessis Posot Office (historical) | O'Brien | 1519 | Plessis |
| Hartley Post Office | Hartley Post Office | O'Brien | 1470 | Hartley |
| Calumet Post Office | Calumet Post Office | O'Brien | 1434 | Sutherland West |
| Archer Post Office | Archer Post Office | O'Brien | 1470 | Primghar |
| Wendell Post Office (historical) | Wendell Post Office (historical) | Cherokee | 1142 | Washta |
| Fielding Post Office (historical) | Fielding Post Office (historical) | Cherokee | 1394 | Fielding |
| East Hampton Post Office (historical) | East Hampton Post Office (historical) | Cherokee | 1404 | Quimby SE |
| De Leon Post Office (historical) | De Leon Post Office (historical) | Cherokee | 1306 | Cherokee South |
| Diamond Post Office (historical) | Diamond Post Office (historical) | Cherokee | 1365 | Galva |
| Coulson Post Office (historical) | Coulson Post Office (historical) | Cherokee | 1362 | Galva |
| Baum Post Office (historical) | Baum Post Office (historical) | Cherokee | 1332 | Quimby |
| Cherokee Post Office | Cherokee Post Office | Cherokee | 1211 | Cherokee North |
| Marcus Post Office | Marcus Post Office | Cherokee | 1473 | Marcus |
| Aurelia Post Office | Aurelia Post Office | Cherokee | 1391 | Aurelia |
| Washta Post Office | Washta Post Office | Cherokee | 1152 | Washta |
| Quimby Post Office | Quimby Post Office | Cherokee | 1181 | Quimby |
| Meriden Post Office | Meriden Post Office | Cherokee | 1411 | Cleghorn |
| Larrabee Post Office | Larrabee Post Office | Cherokee | 1368 | Cherokee North |
| Cleghorn Post Office | Cleghorn Post Office | Cherokee | 1467 | Cleghorn |
| Runyan Post Office (historical) | Runyan Post Office (historical) | Osceola | 1489 | Melvin |
| May City Post Office (historical) | May City Post Office (historical) | Osceola | 1427 | May City |
| Holman Post Office (historical) | Holman Post Office (historical) | Osceola | 1598 | Sibley East |
| Gopher Post Office (historical) | Gopher Post Office (historical) | Osceola | 1516 | Cloverdale |
| Cloverdale Post Office (historical) | Cloverdale Post Office (historical) | Osceola | 1529 | Cloverdale |
| Allendorf Post Office (historical) | Allendorf Post Office (historical) | Osceola | 1598 | Sibley East |
| Sibley Post Office | Sibley Post Office | Osceola | 1516 | Sibley East |
| Ocheyedan Post Office | Ocheyedan Post Office | Osceola | 1575 | Ocheyedan |
| Melvin Post Office | Melvin Post Office | Osceola | 1578 | Melvin |
| Harris Post Office | Harris Post Office | Osceola | 1552 | Harris |
| Ashton Post Office | Ashton Post Office | Osceola | 1453 | Ashton |
| Swanlake Post Office (historical) | Swanlake Post Office (historical) | Emmet | 1306 | Ingham Lake |
| Voss Post Office (historical) | Voss Post Office (historical) | Emmet | 1276 | Ingham Lake |
| Twelve Mile Lake Post Office (historical) | Twelve Mile Lake Post Office (historical) | Emmet | 1457 | Wallingford |
| Roslea Post Office (historical) | Roslea Post Office (historical) | Emmet | 1247 | Gruver |
| Raleigh Post Office (historical) | Raleigh Post Office (historical) | Emmet | 1457 | Wallingford |
| Highlake Post Office (historical) | Highlake Post Office (historical) | Emmet | 1289 | Wallingford |
| Lakeside Post Office (historical) | Lakeside Post Office (historical) | Emmet | 1371 | Estherville |
| Island Grove Post Office (historical) | Island Grove Post Office (historical) | Emmet | 1286 | Ingham Lake |
| Hoprig Post Office (historical) | Hoprig Post Office (historical) | Emmet | 1253 | Ringsted |
| Huntington Post Office (historical) | Huntington Post Office (historical) | Emmet | 1342 | Estherville |
| High Lake Post Office (historical) | High Lake Post Office (historical) | Emmet | 1263 | Wallingford |
| Halfa Post Office (historical) | Halfa Post Office (historical) | Emmet | 1273 | Ringsted |
| Gridley Post Office (historical) | Gridley Post Office (historical) | Emmet | 1273 | Dolliver |
| Forsyth Post Office (historical) | Forsyth Post Office (historical) | Emmet | 1247 | Seneca |
| Bubona Post Office (historical) | Bubona Post Office (historical) | Emmet | 1280 | Ingham Lake |
| Brevick Post Office (historical) | Brevick Post Office (historical) | Emmet | 1280 | Ingham Lake |
| Butter Hill Post Office (historical) | Butter Hill Post Office (historical) | Emmet | Unknown | |
| Estherville Post Office | Estherville Post Office | Emmet | 1302 | Estherville |
| Wallingford Post Office | Wallingford Post Office | Emmet | 1283 | Wallingford |
| Ringsted Post Office | Ringsted Post Office | Emmet | 1280 | Ringsted |
| Gruver Post Office (historical) | Gruver Post Office (historical) | Emmet | 1302 | Gruver |
| Armstrong Post Office | Armstrong Post Office | Emmet | 1247 | Armstrong |
| Maple Hill Post Office (historical) | Maple Hill Post Office (historical) | Emmet | 1289 | Dolliver |
| Dolliver Post Office | Dolliver Post Office | Emmet | 1293 | Dolliver |
| Wallace Post Office (historical) | Wallace Post Office (historical) | Dickinson | 1427 | Lake Park SE |
| The Inn Post Office (historical) | The Inn Post Office (historical) | Dickinson | 1427 | Okoboji |
| Montgomery Post Office (historical) | Montgomery Post Office (historical) | Dickinson | 1457 | Okoboji |
| Orleans Post Office (historical) | Orleans Post Office (historical) | Dickinson | 1407 | Spirit Lake |
| Methodist Camp Post Office (historical) | Methodist Camp Post Office (historical) | Dickinson | 1457 | Okoboji |
| Lakeville Post Office (historical) | Lakeville Post Office (historical) | Dickinson | 1486 | Milford |
| Manhattan Post Office (historical) | Manhattan Post Office (historical) | Dickinson | 1417 | Okoboji |
| Hayward Post Office (historical) | Hayward Post Office (historical) | Dickinson | 1404 | Okoboji |
| Hunters Post Office (historical) | Hunters Post Office (historical) | Dickinson | 1407 | Spirit Lake |
| Spirit Lake Post Office | Spirit Lake Post Office | Dickinson | 1457 | Spirit Lake |
| Lake Park Post Office | Lake Park Post Office | Dickinson | 1496 | Lake Park |
| Terril Post Office | Terril Post Office | Dickinson | 1434 | Terril |
| Superior Post Office | Superior Post Office | Dickinson | 1493 | Superior |
| Milford Post Office | Milford Post Office | Dickinson | 1437 | Milford |
| Okoboji Post Office | Okoboji Post Office | Dickinson | 1411 | Okoboji |
| Arnolds Park Post Office | Arnolds Park Post Office | Dickinson | 1450 | Milford |
| Hagerty Post Office (historical) | Hagerty Post Office (historical) | Dickinson | 1401 | Lake Park SE |
| Ramsay Post Office (historical) | Ramsay Post Office (historical) | Kossuth | 1178 | German Valley |
| Sexton Post Office (historical) | Sexton Post Office (historical) | Kossuth | 1220 | Sexton |
| Saint Benedict Post Office (historical) | Saint Benedict Post Office (historical) | Kossuth | 1257 | Sexton |
| Rahm Post Office (historical) | Rahm Post Office (historical) | Kossuth | 1266 | Sexton |
| Plum Creek Post Office (historical) | Plum Creek Post Office (historical) | Kossuth | 1178 | Algona |
| Noebla Post Office (historical) | Noebla Post Office (historical) | Kossuth | 1132 | Burt |
| Lotts Creek Post Office (historical) | Lotts Creek Post Office (historical) | Kossuth | 1214 | Lone Rock |
| Johnson's Settlement Post Office | Johnson's Settlement Post Office | Kossuth | 1184 | Lone Rock |
| Hobarton Post Office (historical) | Hobarton Post Office (historical) | Kossuth | 1217 | Hobarton |
| Hobart Post Office (historical) | Hobart Post Office (historical) | Kossuth | 1217 | Hobarton |
| Hanna Post Office (historical) | Hanna Post Office (historical) | Kossuth | 1178 | Lu Verne |
| Saint Joseph Posot Office (historical) | Saint Joseph Posot Office (historical) | Kossuth | 1102 | Saint Joseph |
| German Valley Post Office (historical) | German Valley Post Office (historical) | Kossuth | 1158 | German Valley |
| Gerled Post Office (historical) | Gerled Post Office (historical) | Kossuth | 1158 | Ledyard |
| Galbraith Post Office (historical) | Galbraith Post Office (historical) | Kossuth | 1158 | Saint Joseph |
| Fine Post Office (historical) | Fine Post Office (historical) | Kossuth | 1161 | Burt |
| Cresco Post Office (historical) | Cresco Post Office (historical) | Kossuth | 1148 | Hobarton |
| Cutler Post Office (historical) | Cutler Post Office (historical) | Kossuth | Unknown | |
| Whittemore Post Office | Whittemore Post Office | Kossuth | 1204 | Whittemore |
| Wesley Post Office | Wesley Post Office | Kossuth | 1257 | Wesley |
| Titonka Post Office | Titonka Post Office | Kossuth | 1161 | Titonka |
| Swea City Post Office | Swea City Post Office | Kossuth | 1181 | Swea City |
| Lu Verne Post Office | Lu Verne Post Office | Kossuth | 1161 | Lu Verne |
| Lone Rock Post Office | Lone Rock Post Office | Kossuth | 1214 | Lone Rock |
| Ledyard Post Office | Ledyard Post Office | Kossuth | 1158 | Ledyard |
| Lakota Post Office | Lakota Post Office | Kossuth | 1145 | Lakota |
| Irvington Post Office (historical) | Irvington Post Office (historical) | Kossuth | 1152 | Algona |
| Fenton Post Office | Fenton Post Office | Kossuth | 1243 | Fenton |
| Burt Post Office | Burt Post Office | Kossuth | 1181 | Burt |
| Bancroft Post Office | Bancroft Post Office | Kossuth | 1181 | Bancroft |
| Algona Post Office | Algona Post Office | Kossuth | 1194 | Algona |
| Ware Post Office (historical) | Ware Post Office (historical) | Pocahontas | 1289 | Laurens |
| Shirley Post Office (historical) | Shirley Post Office (historical) | Pocahontas | 1263 | Fonda NE |
| Rust Post Office (historical) | Rust Post Office (historical) | Pocahontas | 1263 | Pocahontas |
| Rubens Post Office (historical) | Rubens Post Office (historical) | Pocahontas | 1188 | Rolfe |
| Pocahontas Post Office (historical) | Pocahontas Post Office (historical) | Pocahontas | Unknown | |
| Parvin Post Office (historical) | Parvin Post Office (historical) | Pocahontas | 1184 | Bradgate |
| Gilmore City Post Office | Gilmore City Post Office | Pocahontas | 1234 | Gilmore City |
| Luella Post Office (historical) | Luella Post Office (historical) | Pocahontas | 1260 | Havelock |
| Lizzard Post Office (historical) | Lizzard Post Office (historical) | Pocahontas | Unknown | |
| Lizard Post Office (historical) | Lizard Post Office (historical) | Pocahontas | Unknown | |
| Lilly Post Office (historical) | Lilly Post Office (historical) | Pocahontas | 1283 | Fonda NE |
| Learned Post Office (historical) | Learned Post Office (historical) | Pocahontas | 1237 | Pocahontas |
| Spring Flower Post Office (historical) | Spring Flower Post Office (historical) | Pocahontas | Unknown | |
| Garvey Post Office (historical) | Garvey Post Office (historical) | Pocahontas | Unknown | |
| Garlock Post Office (historical) | Garlock Post Office (historical) | Pocahontas | 1339 | Rush Lake West |
| Buda Post Office (historical) | Buda Post Office (historical) | Pocahontas | 1211 | Palmer |
| Blanden Post Office (historical) | Blanden Post Office (historical) | Pocahontas | 1230 | Manson |
| Ben Lomond Post Office (historical) | Ben Lomond Post Office (historical) | Pocahontas | 1181 | Bradgate |
| Pocahontas Post Office | Pocahontas Post Office | Pocahontas | 1230 | Pocahontas |
| Laurens Post Office | Laurens Post Office | Pocahontas | 1312 | Laurens |
| Varina Post Office | Varina Post Office | Pocahontas | 1260 | Varina |
| Plover Post Office | Plover Post Office | Pocahontas | 1211 | Plover |
| Palmer Post Office | Palmer Post Office | Pocahontas | 1243 | Palmer |
| Havelock Post Office | Havelock Post Office | Pocahontas | 1227 | Havelock |
| Fonda Post Office | Fonda Post Office | Pocahontas | 1230 | Fonda |
| Rolfe Post Office | Rolfe Post Office | Pocahontas | 1188 | Rolfe |
| Sherlock Post Office (historical) | Sherlock Post Office (historical) | Palo Alto | 1322 | Ayrshire |
| Rush Lake Post Office (historical) | Rush Lake Post Office (historical) | Palo Alto | 1362 | Rush Lake West |
| Paoli Post Office (historical) | Paoli Post Office (historical) | Palo Alto | 1234 | Emmetsburg |
| Lake View Post Office (historical) | Lake View Post Office (historical) | Palo Alto | 1332 | Ayrshire |
| Fallow Post Office (historical) | Fallow Post Office (historical) | Palo Alto | 1345 | Graettinger West |
| Ellenton Post Office (historical) | Ellenton Post Office (historical) | Palo Alto | 1257 | Graettinger East |
| Black Walnut Post Office (historical) | Black Walnut Post Office (historical) | Palo Alto | 1270 | Graettinger East |
| Emmetsburg Post Office | Emmetsburg Post Office | Palo Alto | 1247 | Emmetsburg |
| Crippen Post Office (historical) | Crippen Post Office (historical) | Palo Alto | 1266 | Ayrshire |
| Osgood Post Office (historical) | Osgood Post Office (historical) | Palo Alto | 1227 | Graettinger East |
| Depew Post Office (historical) | Depew Post Office (historical) | Palo Alto | 1289 | Depew |
| Fairville Post Office (historical) | Fairville Post Office (historical) | Palo Alto | 1299 | Fenton |
| Ruthven Post Office | Ruthven Post Office | Palo Alto | 1434 | Ruthven |
| Rodman Post Office (historical) | Rodman Post Office (historical) | Palo Alto | 1194 | Cylinder |
| Mallard Post Office | Mallard Post Office | Palo Alto | 1230 | Mallard |
| Graettinger Post Office | Graettinger Post Office | Palo Alto | 1247 | Graettinger West |
| Cylinder Post Office | Cylinder Post Office | Palo Alto | 1191 | Cylinder |
| Curlew Post Office | Curlew Post Office | Palo Alto | 1240 | Mallard |
| Ayrshire Post Office | Ayrshire Post Office | Palo Alto | 1322 | Ayrshire |
| Ratna Post Office (historical) | Ratna Post Office (historical) | Winnebago | 1243 | Pilot Knob |
| Delano Post Office (historical) | Delano Post Office (historical) | Winnebago | 1270 | Pilot Knob |
| Mount Valley Post Office (historical) | Mount Valley Post Office (historical) | Winnebago | 1234 | Pilot Knob |
| Tweten Post Office (historical) | Tweten Post Office (historical) | Winnebago | 1257 | Vinje |
| Steen Post Office (historical) | Steen Post Office (historical) | Winnebago | 1181 | Buffalo Center SW |
| Norman Post Office (historical) | Norman Post Office (historical) | Winnebago | 1286 | Bristol |
| Neils Post Office (historical) | Neils Post Office (historical) | Winnebago | 1293 | Forest City |
| Vinje Post Office (historical) | Vinje Post Office (historical) | Winnebago | 1263 | Vinje |
| Hollandale Post Office (historical) | Hollandale Post Office (historical) | Winnebago | 1207 | Thompson |
| Grytte Post Office (historical) | Grytte Post Office (historical) | Winnebago | 1263 | Vinje |
| Deering Post Office (historical) | Deering Post Office (historical) | Winnebago | 1240 | Vinje |
| Nasheim Post Office (historical) | Nasheim Post Office (historical) | Winnebago | 1263 | Vinje |
| Kinne Post Office (historical) | Kinne Post Office (historical) | Winnebago | Unknown | |
| Amund Post Office (historical) | Amund Post Office (historical) | Winnebago | 1224 | Buffalo Center NE |
| Thompson Post Office | Thompson Post Office | Winnebago | 1276 | Thompson |
| Scarville Post Office | Scarville Post Office | Winnebago | 1253 | Lake Mills |
| Rake Post Office | Rake Post Office | Winnebago | 1158 | Buffalo Center |
| Leland Post Office | Leland Post Office | Winnebago | 1220 | Forest City |
| Lake Mills Post Office | Lake Mills Post Office | Winnebago | 1283 | Lake Mills |
| Forest City Post Office | Forest City Post Office | Winnebago | 1286 | Forest City |
| Buffalo Center Post Office | Buffalo Center Post Office | Winnebago | 1197 | Buffalo Center |
| West Scott Post Office (historical) | West Scott Post Office (historical) | Buena Vista | 1424 | Peterson SE |
| Sayre Post Office (historical) | Sayre Post Office (historical) | Buena Vista | 1283 | Varina |
| Racine Post Office (historical) | Racine Post Office (historical) | Buena Vista | 1276 | Storm Lake NE |
| Plum Post Office (historical) | Plum Post Office (historical) | Buena Vista | 1401 | Storm Lake |
| Leverett Post Office (historical) | Leverett Post Office (historical) | Buena Vista | 1362 | Rush Lake West |
| Juniata Post Office (historical) | Juniata Post Office (historical) | Buena Vista | 1384 | Lakeside |
| Peach Post Office (historical) | Peach Post Office (historical) | Buena Vista | 1283 | Storm Lake NE |
| Elkton Post Office (historical) | Elkton Post Office (historical) | Buena Vista | 1430 | Peterson SE |
| Hanover Post Office (historical) | Hanover Post Office (historical) | Buena Vista | 1368 | Schaller North |
| Crozier Post Office (historical) | Crozier Post Office (historical) | Buena Vista | 1289 | Storm Lake NE |
| Blaine Post Office (historical) | Blaine Post Office (historical) | Buena Vista | 1450 | Schaller North |
| Anna Post Office (historical) | Anna Post Office (historical) | Buena Vista | Unknown | |
| Storm Lake Post Office | Storm Lake Post Office | Buena Vista | 1437 | Storm Lake |
| Sulphur Springs Post Office (historical) | Sulphur Springs Post Office (historical) | Buena Vista | 1312 | Newell West |
| Truesdale Post Office | Truesdale Post Office | Buena Vista | 1371 | Storm Lake |
| Sioux Rapids Post Office | Sioux Rapids Post Office | Buena Vista | 1263 | Sioux Rapids |
| Rembrandt Post Office | Rembrandt Post Office | Buena Vista | 1335 | Rembrandt |
| Newell Post Office | Newell Post Office | Buena Vista | 1266 | Newell West |
| Marathon Post Office | Marathon Post Office | Buena Vista | 1394 | Albert City |
| Linn Grove Post Office | Linn Grove Post Office | Buena Vista | 1276 | Sioux Rapids |
| Alta Post Office | Alta Post Office | Buena Vista | 1519 | Alta |
| Albert City Post Office | Albert City Post Office | Buena Vista | 1322 | Albert City |
| Britt Post Office | Britt Post Office | Hancock | 1227 | Britt |
| Garner Post Office | Garner Post Office | Hancock | 1217 | Garner |
| Westlake Post Office (historical) | Westlake Post Office (historical) | Hancock | 1230 | Olaf |
| Stilson Post Office (historical) | Stilson Post Office (historical) | Hancock | 1204 | Wesley |
| Miller Post Office (historical) | Miller Post Office (historical) | Hancock | 1224 | Miller |
| Mikesville Post Office (historical) | Mikesville Post Office (historical) | Hancock | 1168 | Kanawha |
| Hutchins Post Office (historical) | Hutchins Post Office (historical) | Hancock | 1204 | Wesley |
| Hayfield Post Office (historical) | Hayfield Post Office (historical) | Hancock | 1247 | Hayfield |
| German Post Office (historical) | German Post Office (historical) | Hancock | 1230 | Duncan |
| Elk Grove Post Office (historical) | Elk Grove Post Office (historical) | Hancock | 1197 | Miller |
| Duncan Post Office (historical) | Duncan Post Office (historical) | Hancock | 1250 | Duncan |
| Cuba Post Office (historical) | Cuba Post Office (historical) | Hancock | 1194 | Kanawha |
| Concord Post Office (historical) | Concord Post Office (historical) | Hancock | 1220 | Garner |
| Bailey Post Office (historical) | Bailey Post Office (historical) | Hancock | 1217 | Olaf |
| Woden Post Office | Woden Post Office | Hancock | 1227 | Woden |
| Klemme Post Office | Klemme Post Office | Hancock | 1227 | Garner |
| Crystal Lake Post Office | Crystal Lake Post Office | Hancock | 1280 | Crystal Lake |
| Corwith Post Office | Corwith Post Office | Hancock | 1178 | Corwith |
| Kanawha Post Office | Kanawha Post Office | Hancock | 1188 | Kanawha |
| Goodell Post Office | Goodell Post Office | Hancock | 1247 | Goodell |
| Willow Glen Post Office (historical) | Willow Glen Post Office (historical) | Humboldt | 1115 | Bradgate |
| Walbridge Grove Post Office (historical) | Walbridge Grove Post Office (historical) | Humboldt | Unknown | |
| Unique Post Office (historical) | Unique Post Office (historical) | Humboldt | 1148 | Unique |
| Sylvan Retreat Post Office (historical) | Sylvan Retreat Post Office (historical) | Humboldt | 1132 | Humboldt |
| Pleasant View Post Office (historical) | Pleasant View Post Office (historical) | Humboldt | 1119 | Bode |
| Pioneer Post Office (historical) | Pioneer Post Office (historical) | Humboldt | 1188 | Gilmore City |
| Owlake Post Office (historical) | Owlake Post Office (historical) | Humboldt | 1122 | Hardy |
| Nora Post Office (historical) | Nora Post Office (historical) | Humboldt | 1148 | Bode |
| McKnight Post Office (historical) | McKnight Post Office (historical) | Humboldt | 1155 | West Bend |
| Eber Post Office (historical) | Eber Post Office (historical) | Humboldt | 1106 | Saint Joseph |
| Byron Post Office (historical) | Byron Post Office (historical) | Humboldt | 1125 | Saint Joseph |
| Ash Post Office (historical) | Ash Post Office (historical) | Humboldt | 1138 | Lu Verne |
| Arnold Post Office (historical) | Arnold Post Office (historical) | Humboldt | 1132 | Livermore |
| Addison Post Office (historical) | Addison Post Office (historical) | Humboldt | 1122 | Humboldt |
| Humboldt Post Office | Humboldt Post Office | Humboldt | 1086 | Humboldt |
| Dakota City Post Office | Dakota City Post Office | Humboldt | 1129 | Humboldt |
| Thor Post Office | Thor Post Office | Humboldt | 1138 | Thor |
| Rutland Post Office | Rutland Post Office | Humboldt | 1102 | Bode |
| Renwick Post Office | Renwick Post Office | Humboldt | 1155 | Renwick |
| Ottosen Post Office | Ottosen Post Office | Humboldt | 1158 | West Bend |
| Livermore Post Office | Livermore Post Office | Humboldt | 1142 | Livermore |
| Hardy Post Office | Hardy Post Office | Humboldt | 1135 | Hardy |
| Bradgate Post Office | Bradgate Post Office | Humboldt | 1122 | Bradgate |
| Bode Post Office | Bode Post Office | Humboldt | 1152 | Bode |
| Tom Corwin Post Office (historical) | Tom Corwin Post Office (historical) | Allamakee | Unknown | |
| Wheelerwood Post Office (historical) | Wheelerwood Post Office (historical) | Cerro Gordo | 1155 | Clear Lake East |
| Rock Post Office (historical) | Rock Post Office (historical) | Cerro Gordo | 1152 | Fertile SE |
| Portland Post Office (historical) | Portland Post Office (historical) | Cerro Gordo | 1079 | Nora Springs |
| Park Post Office (historical) | Park Post Office (historical) | Cerro Gordo | 1270 | Ventura Heights |
| Owens Grove Post Office (historical) | Owens Grove Post Office (historical) | Cerro Gordo | 1181 | Mason City SE |
| Owen Centre Post Office (historical) | Owen Centre Post Office (historical) | Cerro Gordo | 1152 | Mason City SE |
| Owen Post Office (historical) | Owen Post Office (historical) | Cerro Gordo | 1129 | Mason City SE |
| Lime Creek Post Office (historical) | Lime Creek Post Office (historical) | Cerro Gordo | 1119 | Mason City |
| Hanford Post Office (historical) | Hanford Post Office (historical) | Cerro Gordo | 1194 | Hanford |
| Freeman Post Office (historical) | Freeman Post Office (historical) | Cerro Gordo | 1148 | Mason City |
| Emery Post Office (historical) | Emery Post Office (historical) | Cerro Gordo | 1168 | Clear Lake East |
| Creamery Post Office (historical) | Creamery Post Office (historical) | Cerro Gordo | 1204 | Clear Lake East |
| Coldwater Post Office (historical) | Coldwater Post Office (historical) | Cerro Gordo | 1112 | Dougherty |
| Cartersville Post Office (historical) | Cartersville Post Office (historical) | Cerro Gordo | 1178 | Dougherty |
| Burchinal Post Office (historical) | Burchinal Post Office (historical) | Cerro Gordo | 1230 | Burchinal |
| Bath Post Office (historical) | Bath Post Office (historical) | Cerro Gordo | 1191 | Hanford |
| Mason City Post Office | Mason City Post Office | Cerro Gordo | 1129 | Mason City |
| Ventura Post Office | Ventura Post Office | Cerro Gordo | 1260 | Clear Lake West |
| Thornton Post Office | Thornton Post Office | Cerro Gordo | 1188 | Thornton |
| Rockwell Post Office | Rockwell Post Office | Cerro Gordo | 1129 | Sheffield |
| Rock Falls Post Office (historical) | Rock Falls Post Office (historical) | Cerro Gordo | 1109 | Nora Springs |
| Meservey Post Office | Meservey Post Office | Cerro Gordo | 1257 | Thornton |
| Clear Lake Post Office | Clear Lake Post Office | Cerro Gordo | 1240 | Clear Lake West |
| Dougherty Post Office | Dougherty Post Office | Cerro Gordo | 1099 | Dougherty |
| Swaledale Post Office | Swaledale Post Office | Cerro Gordo | 1155 | Swaledale |
| Plymouth Post Office | Plymouth Post Office | Cerro Gordo | 1132 | Nora Springs |
| Woodside Post Office (historical) | Woodside Post Office (historical) | Winneshiek | 1119 | Postville NW |
| Winneshiek Post Office (historical) | Winneshiek Post Office (historical) | Winneshiek | 1184 | Postville |
| Willimantic Post Office (historical) | Willimantic Post Office (historical) | Winneshiek | 1204 | Cresco NE |
| Washington Prairie Post Office (historical) | Washington Prairie Post Office (historical) | Winneshiek | 906 | Freeport |
| Trout River Post Office (historical) | Trout River Post Office (historical) | Winneshiek | 1165 | Postville NW |
| Thoten Post Office (historical) | Thoten Post Office (historical) | Winneshiek | 1214 | Freeport |
| Sattre Post Office (historical) | Sattre Post Office (historical) | Winneshiek | 1102 | Highlandville |
| Sampson Post Office (historical) | Sampson Post Office (historical) | Winneshiek | 1165 | Highlandville |
| Orlean Post Office (historical) | Orlean Post Office (historical) | Winneshiek | 1296 | Cresco SE |
| Nordness Post Office (historical) | Nordness Post Office (historical) | Winneshiek | 1047 | Calmar |
| Navan Post Office (historical) | Navan Post Office (historical) | Winneshiek | 1148 | Waucoma |
| Nasset Post Office (historical) | Nasset Post Office (historical) | Winneshiek | 955 | Freeport |
| Morgan Post Office (historical) | Morgan Post Office (historical) | Winneshiek | 1168 | Cresco NE |
| Moneek Post Office (historical) | Moneek Post Office (historical) | Winneshiek | 1076 | Frankville |
| Locust Post Office (historical) | Locust Post Office (historical) | Winneshiek | 1253 | Highlandville |
| Kendallville Post Office (historical) | Kendallville Post Office (historical) | Winneshiek | 1063 | Cresco NE |
| Jamestown Post Office (historical) | Jamestown Post Office (historical) | Winneshiek | 1207 | Frankville |
| Isted Post Office (historical) | Isted Post Office (historical) | Winneshiek | 955 | Freeport |
| Hyde Post Office (historical) | Hyde Post Office (historical) | Winneshiek | 1220 | Postville NW |
| Highlandville Post Office (historical) | Highlandville Post Office (historical) | Winneshiek | 951 | Highlandville |
| Hesper Post Office (historical) | Hesper Post Office (historical) | Winneshiek | 1342 | Burr Oak |
| Franklin Prairie Post Office (historical) | Franklin Prairie Post Office (historical) | Winneshiek | 1181 | Burr Oak |
| Festina Post Office | Festina Post Office | Winneshiek | 1096 | Festina |
| Eide Post Office (historical) | Eide Post Office (historical) | Winneshiek | 978 | Highlandville |
| Conover Post Office (historical) | Conover Post Office (historical) | Winneshiek | 1237 | Fort Atkinson |
| Plymouth Rock Post Office (historical) | Plymouth Rock Post Office (historical) | Winneshiek | 1040 | Bluffton |
| Canoe Post Office (historical) | Canoe Post Office (historical) | Winneshiek | 958 | Freeport |
| Burr Oak Springs Post Office (historical) | Burr Oak Springs Post Office (historical) | Winneshiek | 1115 | Ridgeway |
| Bluffton Post Office (historical) | Bluffton Post Office (historical) | Winneshiek | 981 | Bluffton |
| Springwater Post Office (historical) | Springwater Post Office (historical) | Winneshiek | 1125 | Highlandville |
| Aquilla Grove Post Office (historical) | Aquilla Grove Post Office (historical) | Winneshiek | 1060 | Highlandville |
| Cupid Post Office (historical) | Cupid Post Office (historical) | Winneshiek | Unknown | |
| Decorah Post Office | Decorah Post Office | Winneshiek | 860 | Decorah |
| Burr Oak Post Office (historical) | Burr Oak Post Office (historical) | Winneshiek | 1240 | Burr Oak |
| Frankville Post Office (historical) | Frankville Post Office (historical) | Winneshiek | 1227 | Frankville |
| Freeport Post Office (historical) | Freeport Post Office (historical) | Winneshiek | 846 | Freeport |
| Spillville Post Office | Spillville Post Office | Winneshiek | 1063 | Fort Atkinson |
| Ridgeway Post Office | Ridgeway Post Office | Winneshiek | 1220 | Ridgeway |
| Ossian Post Office | Ossian Post Office | Winneshiek | 1270 | Calmar |
| Jackson Junction Post Office | Jackson Junction Post Office | Winneshiek | 1158 | Waucoma |
| Fort Atkinson Post Office | Fort Atkinson Post Office | Winneshiek | 1027 | Fort Atkinson |
| Castalia Post Office | Castalia Post Office | Winneshiek | 1247 | Castalia |
| Calmar Post Office | Calmar Post Office | Winneshiek | 1257 | Calmar |
| Yankee Post Office (historical) | Yankee Post Office (historical) | Clay | 1411 | Royal |
| Trimello Post Office (historical) | Trimello Post Office (historical) | Clay | 1404 | Royal |
| Prospect Post Office (historical) | Prospect Post Office (historical) | Clay | 1453 | Dickens |
| Platt Post Office (historical) | Platt Post Office (historical) | Clay | 1427 | Rush Lake West |
| Langdon Post Office (historical) | Langdon Post Office (historical) | Clay | 1368 | Dickens |
| Ingleville Post Office (historical) | Ingleville Post Office (historical) | Clay | 1417 | Royal |
| Herdland Post Office (historical) | Herdland Post Office (historical) | Clay | 1352 | Webb |
| Cromwell Center Post Office (historical) | Cromwell Center Post Office (historical) | Clay | 1348 | Everly |
| Cornell Post Office (historical) | Cornell Post Office (historical) | Clay | 1394 | Sioux Rapids |
| Bridgewater Post Office (historical) | Bridgewater Post Office (historical) | Clay | 1358 | Ruthven |
| Spencer Post Office | Spencer Post Office | Clay | 1322 | Spencer |
| Royal Post Office | Royal Post Office | Clay | 1417 | Royal |
| Rossie Post Office (historical) | Rossie Post Office (historical) | Clay | 1411 | Greenville |
| Webb Post Office | Webb Post Office | Clay | 1378 | Webb |
| Peterson Post Office | Peterson Post Office | Clay | 1250 | Peterson |
| Greenville Post Office (historical) | Greenville Post Office (historical) | Clay | 1394 | Greenville |
| Fostoria Post Office | Fostoria Post Office | Clay | 1457 | Spencer |
| Everly Post Office | Everly Post Office | Clay | 1365 | Everly |
| Dickens Post Office | Dickens Post Office | Clay | 1335 | Dickens |
| Thrall Post Office (historical) | Thrall Post Office (historical) | Wright | 1129 | Renwick |
| Rosedale Post Office (historical) | Rosedale Post Office (historical) | Wright | 1106 | Eagle Grove |
| Palsville Post Office (historical) | Palsville Post Office (historical) | Wright | 1240 | Goodell |
| Morhain Post Office (historical) | Morhain Post Office (historical) | Wright | 1207 | Clarion |
| Montgomery Post Office (historical) | Montgomery Post Office (historical) | Wright | 1125 | Renwick |
| Florence Post Office (historical) | Florence Post Office (historical) | Wright | 1129 | Holmes |
| Dry Lake Post Office (historical) | Dry Lake Post Office (historical) | Wright | 1211 | Sheldon Creek |
| Drew Post Office (historical) | Drew Post Office (historical) | Wright | 1168 | Kanawha SE |
| Bruce Post Office (historical) | Bruce Post Office (historical) | Wright | 1175 | Kanawha SE |
| Cornelia Post Office (historical) | Cornelia Post Office (historical) | Wright | 1207 | Cornelia |
| Lena Post Office (historical) | Lena Post Office (historical) | Wright | Unknown | |
| Aldrich Post Office (historical) | Aldrich Post Office (historical) | Wright | Unknown | |
| Eagle Grove Post Office | Eagle Grove Post Office | Wright | 1112 | Eagle Grove |
| Olaf Post Office (historical) | Olaf Post Office (historical) | Wright | 1234 | Olaf |
| Woolstock Post Office | Woolstock Post Office | Wright | 1109 | Woolstock |
| Goldfield Post Office | Goldfield Post Office | Wright | 1125 | Eagle Grove |
| Rowan Post Office | Rowan Post Office | Wright | 1214 | Dows West |
| Galt Post Office | Galt Post Office | Wright | 1207 | Dows West |
| Dows Post Office | Dows Post Office | Wright | 1148 | Dows West |
| Holmes Post Office (historical) | Holmes Post Office (historical) | Wright | 1148 | Holmes |
| Clarion Post Office | Clarion Post Office | Wright | 1181 | Clarion |
| Belmond Post Office | Belmond Post Office | Wright | 1178 | Belmond |
| Westfield Post Office (historical) | Westfield Post Office (historical) | Worth | 1165 | Manly |
| Wales Post Office (historical) | Wales Post Office (historical) | Worth | 1201 | Grafton |
| Tenold Post Office (historical) | Tenold Post Office (historical) | Worth | 1220 | Fertile NE |
| Somber Post Office (historical) | Somber Post Office (historical) | Worth | 1286 | Bristol |
| Nordland Post Office (historical) | Nordland Post Office (historical) | Worth | 1293 | Fertile |
| Meltonville Post Office (historical) | Meltonville Post Office (historical) | Worth | 1201 | Carpenter |
| Leni Post Office (historical) | Leni Post Office (historical) | Worth | 1138 | Grafton |
| Lark Post Office (historical) | Lark Post Office (historical) | Worth | 1250 | Fertile |
| Lansrud Post Office (historical) | Lansrud Post Office (historical) | Worth | 1296 | Bristol |
| Kensett Post Office | Kensett Post Office | Worth | 1217 | Manly |
| Hirondelle Post Office (historical) | Hirondelle Post Office (historical) | Worth | 1194 | Fertile SE |
| Hartland Post Office (historical) | Hartland Post Office (historical) | Worth | 1250 | Fertile NE |
| Hanson Post Office (historical) | Hanson Post Office (historical) | Worth | 1243 | Bristol |
| Glade Post Office (historical) | Glade Post Office (historical) | Worth | 1175 | Manly |
| Elkcreek Post Office (historical) | Elkcreek Post Office (historical) | Worth | 1214 | Fertile NE |
| Deercreek Post Office (historical) | Deercreek Post Office (historical) | Worth | 1207 | Northwood |
| Bristol Post Office (historical) | Bristol Post Office (historical) | Worth | 1257 | Bristol |
| Bolan Post Office (historical) | Bolan Post Office (historical) | Worth | 1227 | Grafton |
| Northwood Post Office | Northwood Post Office | Worth | 1230 | Northwood |
| Manly Post Office | Manly Post Office | Worth | 1194 | Manly |
| Joice Post Office | Joice Post Office | Worth | 1263 | Fertile |
| Grafton Post Office | Grafton Post Office | Worth | 1207 | Fertile |
| Grafton Post Office | Grafton Post Office | Worth | 1230 | Grafton |
| Fertile Post Office | Fertile Post Office | Worth | 1171 | Fertile |
| Ollin Post Office (historical) | Ollin Post Office (historical) | Franklin | 1152 | Popejoy |
| Oakland Valley Post Office (historical) | Oakland Valley Post Office (historical) | Franklin | 1125 | Popejoy |
| Reeve Post Office (historical) | Reeve Post Office (historical) | Franklin | 1188 | Hampton South |
| Faulkner Post Office (historical) | Faulkner Post Office (historical) | Franklin | 1109 | Ackley |
| Washburn Post Office (historical) | Washburn Post Office (historical) | Franklin | 1060 | Hampton North |
| Elida Post Office (historical) | Elida Post Office (historical) | Franklin | 1053 | Hampton North |
| Cream Hill Post Office (historical) | Cream Hill Post Office (historical) | Franklin | 1033 | Hansell |
| Burdette Post Office (historical) | Burdette Post Office (historical) | Franklin | 1168 | Iowa Falls West |
| Hampton Post Office | Hampton Post Office | Franklin | 1148 | Hampton South |
| Sheffield Post Office | Sheffield Post Office | Franklin | 1076 | Sheffield |
| Popejoy Post Office | Popejoy Post Office | Franklin | 1155 | Popejoy |
| Latimer Post Office | Latimer Post Office | Franklin | 1240 | Latimer |
| Hansell Post Office | Hansell Post Office | Franklin | 1033 | Hansell |
| Geneva Post Office | Geneva Post Office | Franklin | 1099 | Hampton South |
| Coulter Post Office | Coulter Post Office | Franklin | 1240 | Coulter |
| Chapin Post Office | Chapin Post Office | Franklin | 1158 | Hampton North |
| Bradford Post Office | Bradford Post Office | Franklin | 1253 | Hampton South |
| Alexander Post Office | Alexander Post Office | Franklin | 1270 | Alexander |
| West Mitchell Post Office (historical) | West Mitchell Post Office (historical) | Mitchell | 1184 | Osage |
| Wapsie Post Office (historical) | Wapsie Post Office (historical) | Mitchell | 1309 | McIntire |
| Otranto Post Office (historical) | Otranto Post Office (historical) | Mitchell | 1155 | Carpenter |
| Otranto Post Office (historical) | Otranto Post Office (historical) | Mitchell | 1148 | Saint Ansgar |
| Olin Post Office (historical) | Olin Post Office (historical) | Mitchell | 1188 | Osage SW |
| North Bend Post Office (historical) | North Bend Post Office (historical) | Mitchell | 1224 | McIntire |
| Newburgh Post Office (historical) | Newburgh Post Office (historical) | Mitchell | 1155 | Saint Ansgar |
| New Haven Post Office (historical) | New Haven Post Office (historical) | Mitchell | 1119 | New Haven |
| Mitchell Post Office (historical) | Mitchell Post Office (historical) | Mitchell | 1197 | Osage |
| Nelson Post Office (historical) | Nelson Post Office (historical) | Mitchell | 1194 | Riceville |
| Meyer Post Office (historical) | Meyer Post Office (historical) | Mitchell | 1273 | Little Cedar |
| Meroa Post Office (historical) | Meroa Post Office (historical) | Mitchell | 1132 | Rudd |
| Lincoln Centre Post Office (historical) | Lincoln Centre Post Office (historical) | Mitchell | 1168 | New Haven |
| Leoti Post Office (historical) | Leoti Post Office (historical) | Mitchell | 1119 | Orchard |
| Hustad Post Office (historical) | Hustad Post Office (historical) | Mitchell | 1171 | Saint Ansgar |
| Dramen Post Office (historical) | Dramen Post Office (historical) | Mitchell | 1145 | Rudd |
| Dixie Post Office (historical) | Dixie Post Office (historical) | Mitchell | 1191 | Osage SW |
| David Post Office (historical) | David Post Office (historical) | Mitchell | 1266 | Little Cedar |
| Brownville Post Office (historical) | Brownville Post Office (historical) | Mitchell | 1142 | New Haven |
| Bailey Post Office (historical) | Bailey Post Office (historical) | Mitchell | 1283 | McIntire |
| Osage Post Office | Osage Post Office | Mitchell | 1171 | Osage |
| Saint Ansgar Post Office | Saint Ansgar Post Office | Mitchell | 1165 | Saint Ansgar |
| Stacyville Post Office | Stacyville Post Office | Mitchell | 1197 | Stacyville |
| Toeterville Post Office (historical) | Toeterville Post Office (historical) | Mitchell | 1191 | Saint Ansgar |
| Orchard Post Office | Orchard Post Office | Mitchell | 1106 | Orchard |
| McIntire Post Office | McIntire Post Office | Mitchell | 1270 | McIntire |
| Carpenter Post Office | Carpenter Post Office | Mitchell | 1191 | Carpenter |
| West Albany Post Office (historical) | West Albany Post Office (historical) | Fayette | 1020 | Fayette |
| Taylorsville Post Office (historical) | Taylorsville Post Office (historical) | Fayette | 1214 | Wadena |
| Scott Post Office (historical) | Scott Post Office (historical) | Fayette | 1155 | Stanley |
| Richfield Post Office (historical) | Richfield Post Office (historical) | Fayette | 1171 | Alpha |
| Penn Post Office (historical) | Penn Post Office (historical) | Fayette | 1030 | Fairbank |
| Orion Post Office (historical) | Orion Post Office (historical) | Fayette | 1119 | West Union |
| Mill Grove Post Office (historical) | Mill Grove Post Office (historical) | Fayette | 896 | Wadena |
| Lima Post Office (historical) | Lima Post Office (historical) | Fayette | 932 | Wadena |
| Leo Post Office (historical) | Leo Post Office (historical) | Fayette | 1142 | Elgin |
| Gamble Grove Post Office (historical) | Gamble Grove Post Office (historical) | Fayette | 988 | Festina |
| Dover Mills Post Office (historical) | Dover Mills Post Office (historical) | Fayette | 863 | Castalia |
| Douglass Post Office (historical) | Douglass Post Office (historical) | Fayette | 974 | Festina |
| Donnan Post Office (historical) | Donnan Post Office (historical) | Fayette | 1152 | Hawkeye |
| Corn Hill Post Office (historical) | Corn Hill Post Office (historical) | Fayette | 1099 | Wadena |
| Brainard Post Office (historical) | Brainard Post Office (historical) | Fayette | 922 | Elgin |
| Alpha Post Office (historical) | Alpha Post Office (historical) | Fayette | 1043 | Alpha |
| Wilson Grove Post Office (historical) | Wilson Grove Post Office (historical) | Fayette | 1122 | Alpha |
| North Field Post Office (historical) | North Field Post Office (historical) | Fayette | Unknown | |
| Louisville Post Office (historical) | Louisville Post Office (historical) | Fayette | Unknown | |
| West Union Post Office | West Union Post Office | Fayette | 1178 | West Union |
| Oelwein Post Office | Oelwein Post Office | Fayette | 1047 | Oelwein |
| Waucoma Post Office | Waucoma Post Office | Fayette | 1043 | Waucoma |
| Wadena Post Office | Wadena Post Office | Fayette | 876 | Wadena |
| Maynard Post Office | Maynard Post Office | Fayette | 1102 | Maynard |
| Hawkeye Post Office | Hawkeye Post Office | Fayette | 1165 | Hawkeye |
| Elgin Post Office | Elgin Post Office | Fayette | 814 | Elgin |
| Clermont Post Office | Clermont Post Office | Fayette | 856 | Castalia |
| Arlington Post Office | Arlington Post Office | Fayette | 1125 | Arlington |
| Fayette Post Office | Fayette Post Office | Fayette | 1014 | Fayette |
| Eldorado Post Office (historical) | Eldorado Post Office (historical) | Fayette | 935 | Festina |
| Westgate Post Office | Westgate Post Office | Fayette | 1093 | Maynard |
| Saint Lucas Post Office | Saint Lucas Post Office | Fayette | 1056 | Saint Lucas |
| Randalia Post Office | Randalia Post Office | Fayette | 1109 | Maynard |
| Watertown Post Office (historical) | Watertown Post Office (historical) | Floyd | 1112 | Orchard |
| Scott Post Office (historical) | Scott Post Office (historical) | Floyd | 1027 | Aureola |
| Roseville Post Office (historical) | Roseville Post Office (historical) | Floyd | 1030 | Roseville |
| Rock Grove City Post Office (historical) | Rock Grove City Post Office (historical) | Floyd | 1109 | Rudd |
| Riverton Post Office (historical) | Riverton Post Office (historical) | Floyd | 1056 | Nashua |
| Ulster Post Office (historical) | Ulster Post Office (historical) | Floyd | 1076 | Roseville |
| Powersville Post Office (historical) | Powersville Post Office (historical) | Floyd | 1033 | Nashua NW |
| Nilesville Post Office (historical) | Nilesville Post Office (historical) | Floyd | 1053 | Floyd |
| Howardville Post Office (historical) | Howardville Post Office (historical) | Floyd | 1135 | Floyd |
| Hackberry Post Office (historical) | Hackberry Post Office (historical) | Floyd | 1066 | Dougherty |
| Flood Creek Post Office (historical) | Flood Creek Post Office (historical) | Floyd | 1125 | Rudd |
| Ernie Post Office (historical) | Ernie Post Office (historical) | Floyd | 1073 | Charles City |
| Carrville Post Office (historical) | Carrville Post Office (historical) | Floyd | 997 | Bassett |
| Carney Post Office (historical) | Carney Post Office (historical) | Floyd | 1066 | Roseville |
| Charles City Post Office | Charles City Post Office | Floyd | 1007 | Charles City |
| Colwell Post Office (historical) | Colwell Post Office (historical) | Floyd | 1155 | Colwell |
| Rudd Post Office | Rudd Post Office | Floyd | 1119 | Rudd |
| Rockford Post Office | Rockford Post Office | Floyd | 1004 | Rockford |
| Nora Springs Post Office | Nora Springs Post Office | Floyd | 1086 | Nora Springs |
| Marble Rock Post Office | Marble Rock Post Office | Floyd | 1004 | Greene |
| Floyd Post Office | Floyd Post Office | Floyd | 1063 | Floyd |
| Wilson Grove Post Office (historical) | Wilson Grove Post Office (historical) | Butler | 1076 | Dumont North |
| Vilmar Post Office (historical) | Vilmar Post Office (historical) | Butler | 1053 | Allison |
| Roots Siding Post Office (historical) | Roots Siding Post Office (historical) | Butler | 958 | Clarksville |
| Prosper Post Office (historical) | Prosper Post Office (historical) | Butler | 1004 | Nashua |
| Packard Post Office (historical) | Packard Post Office (historical) | Butler | 955 | Clarksville |
| Maudville Post Office (historical) | Maudville Post Office (historical) | Butler | 1047 | Allison |
| Island Grove Post Office (historical) | Island Grove Post Office (historical) | Butler | 997 | Dumont South |
| Hitesville Post Office (historical) | Hitesville Post Office (historical) | Butler | 1010 | Dumont South |
| Eleanor Post Office (historical) | Eleanor Post Office (historical) | Butler | 968 | Parkersburg |
| Coster Post Office (historical) | Coster Post Office (historical) | Butler | 974 | Coster |
| Clutterville Post Office (historical) | Clutterville Post Office (historical) | Butler | 1001 | Dumont South |
| Butler Center Post Office (historical) | Butler Center Post Office (historical) | Butler | 1043 | Butler Center |
| Belgrove Post Office (historical) | Belgrove Post Office (historical) | Butler | 1040 | Aureola |
| Benezet Post Office (historical) | Benezet Post Office (historical) | Butler | Unknown | |
| Shell Rock Post Office | Shell Rock Post Office | Butler | 915 | Shell Rock |
| Sinclair Post Office (historical) | Sinclair Post Office (historical) | Butler | 919 | Stout |
| Parkersburg Post Office | Parkersburg Post Office | Butler | 971 | Parkersburg |
| New Hartford Post Office | New Hartford Post Office | Butler | 892 | New Hartford |
| Kesley Post Office | Kesley Post Office | Butler | 1004 | Dumont South |
| Greene Post Office | Greene Post Office | Butler | 955 | Greene |
| Dumont Post Office | Dumont Post Office | Butler | 981 | Dumont North |
| Clarksville Post Office | Clarksville Post Office | Butler | 938 | Clarksville |
| Bristow Post Office | Bristow Post Office | Butler | 1037 | Dumont North |
| Austinville Post Office | Austinville Post Office | Butler | 997 | Aplington |
| Aplington Post Office | Aplington Post Office | Butler | 974 | Aplington |
| Aredale Post Office | Aredale Post Office | Butler | 1020 | Hansell |
| Allison Post Office | Allison Post Office | Butler | 1047 | Allison |
| Waverly Junction Post Office (historical) | Waverly Junction Post Office (historical) | Bremer | 902 | Shell Rock |
| Wapsie Post Office (historical) | Wapsie Post Office (historical) | Bremer | 1030 | Readlyn |
| Spring Lake Post Office (historical) | Spring Lake Post Office (historical) | Bremer | 945 | Plainfield |
| Seigel Post Office (historical) | Seigel Post Office (historical) | Bremer | 1037 | Tripoli |
| Roxie Post Office (historical) | Roxie Post Office (historical) | Bremer | 1056 | Bremer |
| Pony Post Office (historical) | Pony Post Office (historical) | Bremer | 1076 | Tripoli NW |
| Phillipston Post Office (historical) | Phillipston Post Office (historical) | Bremer | 1056 | Tripoli |
| Leroy Post Office (historical) | Leroy Post Office (historical) | Bremer | 1066 | Sumner SW |
| Knott Post Office (historical) | Knott Post Office (historical) | Bremer | 1056 | Tripoli NW |
| Knittel Post Office (historical) | Knittel Post Office (historical) | Bremer | 1010 | Denver |
| Klinger Post Office (historical) | Klinger Post Office (historical) | Bremer | 1020 | Readlyn |
| Key Post Office (historical) | Key Post Office (historical) | Bremer | 1007 | Readlyn |
| Jackson Point Post Office (historical) | Jackson Point Post Office (historical) | Bremer | 1017 | Nashua |
| Horton Post Office (historical) | Horton Post Office (historical) | Bremer | 955 | Bremer |
| Dickey Post Office (historical) | Dickey Post Office (historical) | Bremer | 1076 | Tripoli NW |
| Bremer Post Office (historical) | Bremer Post Office (historical) | Bremer | 1030 | Bremer |
| Breckenridge Post Office (historical) | Breckenridge Post Office (historical) | Bremer | 938 | Denver |
| Artesian Post Office (historical) | Artesian Post Office (historical) | Bremer | 981 | Denver |
| Waverly Post Office | Waverly Post Office | Bremer | 912 | Waverly |
| Tripoli Post Office | Tripoli Post Office | Bremer | 1027 | Tripoli |
| Sumner Post Office | Sumner Post Office | Bremer | 1056 | Sumner |
| Readlyn Post Office | Readlyn Post Office | Bremer | 1037 | Readlyn |
| Plainfield Post Office | Plainfield Post Office | Bremer | 942 | Plainfield |
| Janesville Post Office | Janesville Post Office | Bremer | 899 | Waverly |
| Frederika Post Office | Frederika Post Office | Bremer | 1033 | Frederika |
| Denver Post Office | Denver Post Office | Bremer | 945 | Denver |
| Zillo Post Office (historical) | Zillo Post Office (historical) | Chickasaw | 1132 | Lawler |
| Williamstown Post Office (historical) | Williamstown Post Office (historical) | Chickasaw | 1073 | Frederika |
| Saude Post Office (historical) | Saude Post Office (historical) | Chickasaw | 1145 | Saude |
| Republic Post Office (historical) | Republic Post Office (historical) | Chickasaw | 1096 | Tripoli NW |
| Pearl Rock Post Office (historical) | Pearl Rock Post Office (historical) | Chickasaw | 965 | Nashua |
| North Washington Post Office (historical) | North Washington Post Office (historical) | Chickasaw | 1148 | Ionia |
| Maplesville Post Office (historical) | Maplesville Post Office (historical) | Chickasaw | 1066 | Waucoma |
| Little Turkey Post Office (historical) | Little Turkey Post Office (historical) | Chickasaw | 1102 | Protivin |
| Jerico Post Office (historical) | Jerico Post Office (historical) | Chickasaw | 1142 | Jerico |
| Jacksonville Post Office (historical) | Jacksonville Post Office (historical) | Chickasaw | 1178 | Lawler |
| Dresden Post Office (historical) | Dresden Post Office (historical) | Chickasaw | 1102 | Frederika |
| Devon Post Office (historical) | Devon Post Office (historical) | Chickasaw | 1194 | New Hampton |
| Deerfield Post Office (historical) | Deerfield Post Office (historical) | Chickasaw | 1138 | Elma |
| Dale Post Office (historical) | Dale Post Office (historical) | Chickasaw | 1155 | Saude |
| Chickasaw Post Office (historical) | Chickasaw Post Office (historical) | Chickasaw | 1066 | Ionia |
| Boyd Post Office (historical) | Boyd Post Office (historical) | Chickasaw | 1135 | New Hampton |
| Beaver City Post Office (historical) | Beaver City Post Office (historical) | Chickasaw | 1152 | New Hampton |
| Bassett Post Office (historical) | Bassett Post Office (historical) | Chickasaw | 1056 | Bassett |
| Bradford Post Office (historical) | Bradford Post Office (historical) | Chickasaw | 978 | Nashua |
| New Hampton Post Office | New Hampton Post Office | Chickasaw | 1165 | New Hampton |
| Nashua Post Office | Nashua Post Office | Chickasaw | 974 | Nashua |
| Fredericksburg Post Office | Fredericksburg Post Office | Chickasaw | 1079 | Fredericksburg |
| Lawler Post Office | Lawler Post Office | Chickasaw | 1083 | Lawler |
| Ionia Post Office | Ionia Post Office | Chickasaw | 1142 | Ionia |
| Nansen Post Office (historical) | Nansen Post Office (historical) | Chickasaw | 1145 | Saude |
| Alta Vista Post Office | Alta Vista Post Office | Chickasaw | 1158 | Elma |
| Cresco Post Office | Cresco Post Office | Howard | 1302 | Cresco SE |
| Elma Post Office | Elma Post Office | Howard | 1175 | Elma |
| Vernon Springs Post Office (historical) | Vernon Springs Post Office (historical) | Howard | 1178 | Cresco SW |
| Sturgis Post Office (historical) | Sturgis Post Office (historical) | Howard | 1168 | Jerico |
| Schley Post Office (historical) | Schley Post Office (historical) | Howard | 1270 | Cresco SW |
| Pond Valley Post Office (historical) | Pond Valley Post Office (historical) | Howard | 1197 | Cresco SW |
| Osborn Post Office (historical) | Osborn Post Office (historical) | Howard | Unknown | |
| Oakdale Post Office (historical) | Oakdale Post Office (historical) | Howard | 1207 | Saude |
| New Oregon Post Office (historical) | New Oregon Post Office (historical) | Howard | 1214 | Cresco SE |
| Saratoga Post Office (historical) | Saratoga Post Office (historical) | Howard | 1243 | Saratoga |
| Mapleleaf Post Office (historical) | Mapleleaf Post Office (historical) | Howard | 1220 | Saratoga |
| Lourdes Post Office (historical) | Lourdes Post Office (historical) | Howard | 1230 | Lourdes |
| Lime Spring Post Office (historical) | Lime Spring Post Office (historical) | Howard | 1191 | Lime Springs |
| Foreston Post Office (historical) | Foreston Post Office (historical) | Howard | 1188 | Cresco NW |
| Florenceville Post Office (historical) | Florenceville Post Office (historical) | Howard | 1135 | Cresco NW |
| Davis Corners Post Office (historical) | Davis Corners Post Office (historical) | Howard | 1283 | Lourdes |
| Crane Creek Post Office (historical) | Crane Creek Post Office (historical) | Howard | 1184 | Lourdes |
| Cecelia Post Office (historical) | Cecelia Post Office (historical) | Howard | 1181 | Elma |
| Bonair Post Office (historical) | Bonair Post Office (historical) | Howard | 1312 | Cresco NW |
| Protivin Post Office | Protivin Post Office | Howard | 1152 | Protivin |
| Lime Springs Post Office | Lime Springs Post Office | Howard | 1243 | Lime Springs |
| Chester Post Office | Chester Post Office | Howard | 1227 | Lime Springs |
| Riceville Post Office | Riceville Post Office | Howard | 1234 | Riceville |
| Stella Post Office (historical) | Stella Post Office (historical) | Allamakee | 1109 | Frankville |
| Willsons Ford Post Office (historical) | Willsons Ford Post Office (historical) | Allamakee | 912 | Harpers Ferry |
| Waukon Junction Post Office (historical) | Waukon Junction Post Office (historical) | Allamakee | 636 | Harpers Ferry |
| Village Creek Post Office (historical) | Village Creek Post Office (historical) | Allamakee | 725 | Lansing |
| Rex Post Office (historical) | Rex Post Office (historical) | Allamakee | 1070 | Waukon NW |
| Union Prairie Post Office (historical) | Union Prairie Post Office (historical) | Allamakee | 1224 | Hanover |
| Reeds Ridge Post Office (historical) | Reeds Ridge Post Office (historical) | Allamakee | 1079 | Hanover |
| Quandahl Post Office (historical) | Quandahl Post Office (historical) | Allamakee | 823 | Dorchester |
| Paintville Post Office (historical) | Paintville Post Office (historical) | Allamakee | 942 | Waterville |
| Nezeka Post Office (historical) | Nezeka Post Office (historical) | Allamakee | 630 | Prairie du Chien |
| Maud Post Office (historical) | Maud Post Office (historical) | Allamakee | 942 | Waterville |
| Volney Post Office (historical) | Volney Post Office (historical) | Allamakee | 794 | Waterville |
| Makee Post Office (historical) | Makee Post Office (historical) | Allamakee | 1276 | Waukon |
| Lycurgus Post Office (historical) | Lycurgus Post Office (historical) | Allamakee | 1260 | Waukon |
| Myron Post Office (historical) | Myron Post Office (historical) | Allamakee | 889 | Frankville |
| Ludlow Post Office (historical) | Ludlow Post Office (historical) | Allamakee | 1217 | Frankville |
| Lark Post Office (historical) | Lark Post Office (historical) | Allamakee | 696 | Harpers Ferry |
| Hanover Post Office (historical) | Hanover Post Office (historical) | Allamakee | 1230 | Hanover |
| Rossville Post Office (historical) | Rossville Post Office (historical) | Allamakee | 1175 | Rossville |
| Forest Mills Post Office (historical) | Forest Mills Post Office (historical) | Allamakee | 948 | Rossville |
| Fandon Post Office (historical) | Fandon Post Office (historical) | Allamakee | 1194 | Rossville |
| Elon Post Office (historical) | Elon Post Office (historical) | Allamakee | 1257 | Church |
| Eldergrove Post Office (historical) | Eldergrove Post Office (historical) | Allamakee | 1119 | Harpers Ferry |
| Egan Post Office (historical) | Egan Post Office (historical) | Allamakee | 1138 | Waterville |
| Dalby Post Office (historical) | Dalby Post Office (historical) | Allamakee | 1266 | Church |
| Connor Post Office (historical) | Connor Post Office (historical) | Allamakee | 1224 | Hanover |
| Cleveland Post Office (historical) | Cleveland Post Office (historical) | Allamakee | 1007 | Rossville |
| Lyndale Post Office (historical) | Lyndale Post Office (historical) | Allamakee | 709 | Church |
| Church Post Office (historical) | Church Post Office (historical) | Allamakee | 1260 | Church |
| Capoli Post Office (historical) | Capoli Post Office (historical) | Allamakee | 666 | Lansing |
| Ion Post Office (historical) | Ion Post Office (historical) | Allamakee | 679 | Giard |
| Buckland Post Office (historical) | Buckland Post Office (historical) | Allamakee | 725 | Waterville |
| New Galena Post Office (historical) | New Galena Post Office (historical) | Allamakee | 889 | Dorchester |
| Bergen Post Office (historical) | Bergen Post Office (historical) | Allamakee | 1037 | Dorchester |
| Allamakee Post Office (historical) | Allamakee Post Office (historical) | Allamakee | 614 | Harpers Ferry |
| Webster Post Office (historical) | Webster Post Office (historical) | Allamakee | Unknown | |
| Mariners Hope Post Office (historical) | Mariners Hope Post Office (historical) | Allamakee | Unknown | |
| Waterville Post Office | Waterville Post Office | Allamakee | 879 | Waterville |
| New Albin Post Office | New Albin Post Office | Allamakee | 646 | New Albin |
| Waukon Post Office | Waukon Post Office | Allamakee | 1263 | Waukon |
| Postville Post Office | Postville Post Office | Allamakee | 1178 | Postville |
| Harpers Ferry Post Office | Harpers Ferry Post Office | Allamakee | 653 | Harpers Ferry |
| Dorchester Post Office | Dorchester Post Office | Allamakee | 748 | Dorchester |
| Lansing Post Office | Lansing Post Office | Allamakee | 669 | Lansing |
| Wood Post Office (historical) | Wood Post Office (historical) | Clayton | 1175 | Garber |
| Wagner Post Office (historical) | Wagner Post Office (historical) | Clayton | 1063 | Saint Olaf |
| Wabasha Post Office (historical) | Wabasha Post Office (historical) | Clayton | 1076 | Farmersburg |
| Updegraff Post Office (historical) | Updegraff Post Office (historical) | Clayton | 1135 | Colesburg |
| Turkey River Post Office (historical) | Turkey River Post Office (historical) | Clayton | 630 | Turkey River |
| Sylvan Post Office (historical) | Sylvan Post Office (historical) | Clayton | 1165 | Edgewood |
| Sigel Post Office (historical) | Sigel Post Office (historical) | Clayton | 1004 | Farmersburg |
| Saint Sebald Post Office (historical) | Saint Sebald Post Office (historical) | Clayton | 1135 | Strawberry Point |
| Read Post Office (historical) | Read Post Office (historical) | Clayton | 988 | Farmersburg |
| Pecks Ferry Post Office (historical) | Pecks Ferry Post Office (historical) | Clayton | 636 | Colesburg |
| Panther Creek Post Office (historical) | Panther Creek Post Office (historical) | Clayton | 925 | Garnavillo |
| Osterdock Post Office (historical) | Osterdock Post Office (historical) | Clayton | 640 | Colesburg |
| Osborne Post Office (historical) | Osborne Post Office (historical) | Clayton | 778 | Elkader |
| North Buena Vista Post Office (historical) | North Buena Vista Post Office (historical) | Clayton | 643 | Cassville |
| National Post Office (historical) | National Post Office (historical) | Clayton | 1086 | Farmersburg |
| Millville Post Office (historical) | Millville Post Office (historical) | Clayton | 633 | Turkey River |
| Mederville Post Office (historical) | Mederville Post Office (historical) | Clayton | 794 | Elkader |
| Lodomillo Post Office (historical) | Lodomillo Post Office (historical) | Clayton | 1181 | Edgewood |
| Locust Hill Post Office (historical) | Locust Hill Post Office (historical) | Clayton | 1112 | Saint Olaf |
| Honey Creek Post Office (historical) | Honey Creek Post Office (historical) | Clayton | 1234 | Edgewood |
| Highland Post Office (historical) | Highland Post Office (historical) | Clayton | 1175 | Gunder |
| High Grove Post Office (historical) | High Grove Post Office (historical) | Clayton | 1181 | Volga |
| Henderson Prairie Post Office (historical) | Henderson Prairie Post Office (historical) | Clayton | 1178 | Postville |
| Gunder Post Office (historical) | Gunder Post Office (historical) | Clayton | 1112 | Gunder |
| Grand Meadow Post Office (historical) | Grand Meadow Post Office (historical) | Clayton | 1175 | Postville |
| Graham Post Office (historical) | Graham Post Office (historical) | Clayton | 817 | Turkey River |
| Giard Post Office (historical) | Giard Post Office (historical) | Clayton | 1122 | Giard |
| Froelich Post Office (historical) | Froelich Post Office (historical) | Clayton | 1017 | Giard |
| Council Hill Post Office (historical) | Council Hill Post Office (historical) | Clayton | 1083 | Giard |
| Communia Post Office (historical) | Communia Post Office (historical) | Clayton | 823 | Littleport |
| Clayton Post Office (historical) | Clayton Post Office (historical) | Clayton | 630 | Clayton |
| Ceres Post Office (historical) | Ceres Post Office (historical) | Clayton | 1024 | Garnavillo |
| Cass Post Office (historical) | Cass Post Office (historical) | Clayton | 1079 | Strawberry Point |
| Beulah Post Office (historical) | Beulah Post Office (historical) | Clayton | 932 | Giard |
| Anderson Post Office (historical) | Anderson Post Office (historical) | Clayton | 1191 | Turkey River |
| Littleport Post Office | Littleport Post Office | Clayton | 709 | Littleport |
| New Stand Post Office (historical) | New Stand Post Office (historical) | Clayton | Unknown | |
| Ewington Post Office (historical) | Ewington Post Office (historical) | Clayton | Unknown | |
| Volga Post Office | Volga Post Office | Clayton | 794 | Volga |
| Strawberry Point Post Office | Strawberry Point Post Office | Clayton | 1214 | Strawberry Point |
| Saint Olaf Post Office | Saint Olaf Post Office | Clayton | 856 | Saint Olaf |
| Monona Post Office | Monona Post Office | Clayton | 1217 | Monona |
| McGregor Post Office | McGregor Post Office | Clayton | 692 | Prairie du Chien |
| Marquette Post Office | Marquette Post Office | Clayton | 627 | Prairie du Chien |
| Luana Post Office | Luana Post Office | Clayton | 1135 | Monona |
| Guttenberg Post Office | Guttenberg Post Office | Clayton | 630 | Guttenberg |
| Garnavillo Post Office | Garnavillo Post Office | Clayton | 1063 | Garnavillo |
| Farmersburg Post Office | Farmersburg Post Office | Clayton | 915 | Farmersburg |
| Garber Post Office | Garber Post Office | Clayton | 659 | Garber |
| Elkport Post Office (historical) | Elkport Post Office (historical) | Clayton | 653 | Garber |
| Elkader Post Office | Elkader Post Office | Clayton | 725 | Elkader |
| Edgewood Post Office | Edgewood Post Office | Delaware | 1181 | Edgewood |
| Walnut Post Office | Walnut Post Office | Pottawattamie | 1329 | Walnut |
| Underwood Post Office | Underwood Post Office | Pottawattamie | 1079 | Underwood |
| Treynor Post Office | Treynor Post Office | Pottawattamie | 1211 | Treynor |
| Oakland Post Office | Oakland Post Office | Pottawattamie | 1102 | Oakland |
| Neola Post Office | Neola Post Office | Pottawattamie | 1099 | Neola |
| Minden Post Office | Minden Post Office | Pottawattamie | 1214 | Neola |
| McClelland Post Office | McClelland Post Office | Pottawattamie | 1243 | McClelland |
| Carson Post Office | Carson Post Office | Pottawattamie | 1152 | Carson |
| Honey Creek Post Office (historical) | Honey Creek Post Office (historical) | Pottawattamie | 1014 | Honey Creek |
| Crescent Post Office | Crescent Post Office | Pottawattamie | 1014 | Council Bluffs North |
| Hancock Post Office | Hancock Post Office | Pottawattamie | 1119 | Avoca |
| Avoca Post Office | Avoca Post Office | Pottawattamie | 1148 | Avoca |
| Prairie Flower Post Office (historical) | Prairie Flower Post Office (historical) | Pottawattamie | 1093 | Griswold |
| Keown Post Office (historical) | Keown Post Office (historical) | Pottawattamie | 1266 | Taylor |
| Morton Post Office (historical) | Morton Post Office (historical) | Pottawattamie | 1257 | Walnut |
| Neoga Post Office (historical) | Neoga Post Office (historical) | Pottawattamie | 1020 | Council Bluffs South |
| Lake Manawa Post Office (historical) | Lake Manawa Post Office (historical) | Pottawattamie | 978 | Council Bluffs South |
| Pigeon Post Office (historical) | Pigeon Post Office (historical) | Pottawattamie | 1115 | Honey Creek |
| Nishna Post Office (historical) | Nishna Post Office (historical) | Pottawattamie | 1122 | Avoca |
| New Town Post Office (historical) | New Town Post Office (historical) | Pottawattamie | 1168 | Avoca |
| Whipple Post Office (historical) | Whipple Post Office (historical) | Pottawattamie | 1171 | Atlantic SW |
| Wheeler Post Office (historical) | Wheeler Post Office (historical) | Pottawattamie | 1122 | Carson NE |
| Scottswood Post Office (historical) | Scottswood Post Office (historical) | Pottawattamie | 1217 | Council Bluffs North |
| Islandpark Post Office (historical) | Islandpark Post Office (historical) | Pottawattamie | 974 | Council Bluffs South |
| Keg Creek Post Office (historical) | Keg Creek Post Office (historical) | Pottawattamie | 1076 | Mineola |
| Dumfries Post Office (historical) | Dumfries Post Office (historical) | Pottawattamie | 1234 | Mineola |
| Boyer Post Office (historical) | Boyer Post Office (historical) | Pottawattamie | 1017 | Honey Creek |
| Willow Post Office (historical) | Willow Post Office (historical) | Pottawattamie | 1040 | Loveland |
| Loveland Post Office (historical) | Loveland Post Office (historical) | Pottawattamie | 1017 | Loveland |
| Grable Post Office (historical) | Grable Post Office (historical) | Pottawattamie | 1001 | Loveland |
| French Post Office (historical) | French Post Office (historical) | Pottawattamie | 1119 | Underwood |
| Reels Post Office (historical) | Reels Post Office (historical) | Pottawattamie | 1033 | Honey Creek |
| Harrison Post Office (historical) | Harrison Post Office (historical) | Pottawattamie | 1020 | Honey Creek |
| Boomer Grove Post Office (historical) | Boomer Grove Post Office (historical) | Pottawattamie | 1201 | Honey Creek |
| Boomer Post Office (historical) | Boomer Post Office (historical) | Pottawattamie | 1207 | Honey Creek |
| Taylor Post Office (historical) | Taylor Post Office (historical) | Pottawattamie | 1109 | Taylor |
| Blair Post Office (historical) | Blair Post Office (historical) | Pottawattamie | 1201 | Taylor |
| Bentley Post Office (historical) | Bentley Post Office (historical) | Pottawattamie | 1270 | Neola |
| Ascot Post Office (historical) | Ascot Post Office (historical) | Pottawattamie | 984 | Loveland |
| Weston Post Office (historical) | Weston Post Office (historical) | Pottawattamie | 1093 | McClelland |
| Armour Post Office (historical) | Armour Post Office (historical) | Pottawattamie | 1191 | McClelland |
| Quick Post Office (historical) | Quick Post Office (historical) | Pottawattamie | 1125 | McClelland |
| Walnut Grove Mills Post Office (historical) | Walnut Grove Mills Post Office (historical) | Pottawattamie | Unknown | |
| Silver Creek Post Office (historical) | Silver Creek Post Office (historical) | Pottawattamie | Unknown | |
| Snapp Post Office (historical) | Snapp Post Office (historical) | Pottawattamie | Unknown | |
| Dermyer Post Office (historical) | Dermyer Post Office (historical) | Pottawattamie | Unknown | |
| Deseret Post Office (historical) | Deseret Post Office (historical) | Pottawattamie | 1276 | Beebeetown |
| Council Bluffs Post Office | Council Bluffs Post Office | Pottawattamie | 997 | Council Bluffs North |
| Kemling Post Office (historical) | Kemling Post Office (historical) | Pottawattamie | 1280 | Carson NE |
| Osage Post Office (historical) | Osage Post Office (historical) | Fremont | 948 | Rock Bluff |
| Nunda Post Office (historical) | Nunda Post Office (historical) | Fremont | 1024 | Shenandoah West |
| Randolph Post Office | Randolph Post Office | Fremont | 974 | Randolph |
| Manti Post Office (historical) | Manti Post Office (historical) | Fremont | 981 | Farragut |
| Knox Post Office (historical) | Knox Post Office (historical) | Fremont | 1033 | Sidney |
| Payne Post Office (historical) | Payne Post Office (historical) | Fremont | 922 | Nebraska City |
| Eastport Post Office (historical) | Eastport Post Office (historical) | Fremont | 922 | Nebraska City |
| Dawsonburg Post Office (historical) | Dawsonburg Post Office (historical) | Fremont | 1070 | Tabor SW |
| Farmer City Post Office (historical) | Farmer City Post Office (historical) | Fremont | 1083 | Shenandoah West |
| Cory Post Office (historical) | Cory Post Office (historical) | Fremont | 1089 | Shenandoah West |
| Walnut Creek Post Office (historical) | Walnut Creek Post Office (historical) | Fremont | 1102 | Shenandoah West |
| Thurman Post Office | Thurman Post Office | Fremont | 974 | Tabor SW |
| McPaul Post Office (historical) | McPaul Post Office (historical) | Fremont | 938 | McPaul |
| Buchanan Post Office (historical) | Buchanan Post Office (historical) | Fremont | 948 | McPaul |
| Bartlett Post Office (historical) | Bartlett Post Office (historical) | Fremont | 945 | Rock Bluff |
| Anderson Post Office (historical) | Anderson Post Office (historical) | Fremont | 968 | Randolph |
| Tabor Post Office | Tabor Post Office | Fremont | 1253 | Tabor |
| Sidney Post Office | Sidney Post Office | Fremont | 1168 | Sidney |
| Riverton Post Office | Riverton Post Office | Fremont | 965 | Riverton |
| Hamburg Post Office | Hamburg Post Office | Fremont | 919 | Hamburg |
| Percival Post Office | Percival Post Office | Fremont | 932 | Nebraska City |
| Imogene Post Office | Imogene Post Office | Fremont | 1093 | Imogene |
| Farragut Post Office | Farragut Post Office | Fremont | 961 | Farragut |
| McKissacks Grove Post Office (historical) | McKissacks Grove Post Office (historical) | Fremont | 981 | McElroy Creek |
| Lucky Valley Post Office (historical) | Lucky Valley Post Office (historical) | Woodbury | Unknown | |
| Glenwood Post Office | Glenwood Post Office | Mills | 1004 | Glenwood |
| Whitecloud Post Office (historical) | Whitecloud Post Office (historical) | Mills | 991 | Tabor NE |
| Ward Post Office (historical) | Ward Post Office (historical) | Mills | 1047 | Glenwood |
| Wahaghbonsy Post Office (historical) | Wahaghbonsy Post Office (historical) | Mills | 1201 | Tabor |
| Strahan Post Office (historical) | Strahan Post Office (historical) | Mills | 1145 | Imogene |
| Solomon Post Office (historical) | Solomon Post Office (historical) | Mills | 1138 | Imogene |
| Pacific City Post Office (historical) | Pacific City Post Office (historical) | Mills | 965 | Pacific Junction |
| Jewell Post Office (historical) | Jewell Post Office (historical) | Mills | 1132 | Malvern |
| Indian Creek Post Office (historical) | Indian Creek Post Office (historical) | Mills | 1086 | Emerson |
| Hillsdale Post Office (historical) | Hillsdale Post Office (historical) | Mills | 1224 | Glenwood |
| Haynie Post Office (historical) | Haynie Post Office (historical) | Mills | 948 | Rock Bluff |
| Folsom Post Office (historical) | Folsom Post Office (historical) | Mills | 974 | Pacific Junction |
| Mount Olive Post Office (historical) | Mount Olive Post Office (historical) | Mills | 1227 | Glenwood |
| Fayette Post Office (historical) | Fayette Post Office (historical) | Mills | 1227 | Glenwood |
| Junction City Post Office (historical) | Junction City Post Office (historical) | Mills | 955 | Pacific Junction |
| Sharpsburgh Post Office (historical) | Sharpsburgh Post Office (historical) | Mills | 955 | Pacific Junction |
| East Plattsmouth Post Office (historical) | East Plattsmouth Post Office (historical) | Mills | 955 | Pacific Junction |
| Clark Post Office (historical) | Clark Post Office (historical) | Mills | 1001 | Tabor NE |
| Cerro Gordo Post Office (historical) | Cerro Gordo Post Office (historical) | Mills | 961 | Pacific Junction |
| Boxelder Post Office (historical) | Boxelder Post Office (historical) | Mills | 1109 | Treynor |
| Benton Post Office (historical) | Benton Post Office (historical) | Mills | 1063 | Malvern |
| Balfour Post Office (historical) | Balfour Post Office (historical) | Mills | 1155 | Glenwood |
| Alps Post Office (historical) | Alps Post Office (historical) | Mills | 948 | Rock Bluff |
| Malvern Post Office | Malvern Post Office | Mills | 1001 | Malvern |
| Emerson Post Office | Emerson Post Office | Mills | 1056 | Emerson |
| Ingraham Post Office (historical) | Ingraham Post Office (historical) | Mills | Unknown | |
| Silver City Post Office | Silver City Post Office | Mills | 1047 | Glenwood |
| Pacific Junction Post Office | Pacific Junction Post Office | Mills | 955 | Pacific Junction |
| Mineola Post Office | Mineola Post Office | Mills | 1030 | Mineola |
| Hastings Post Office | Hastings Post Office | Mills | 1001 | Emerson |
| Henderson Post Office (historical) | Henderson Post Office (historical) | Mills | 1056 | Carson |
| Page Post Office (historical) | Page Post Office (historical) | Page | 1201 | Coin |
| Norwich Post Office (historical) | Norwich Post Office (historical) | Page | 1165 | Bingham |
| North Mills Post Office (historical) | North Mills Post Office (historical) | Page | 1007 | Hawleyville |
| North Grove Post Office (historical) | North Grove Post Office (historical) | Page | 1217 | Stanton SW |
| Meade Post Office (historical) | Meade Post Office (historical) | Page | 1207 | Clarinda North |
| Hepburn Post Office (historical) | Hepburn Post Office (historical) | Page | 1024 | Clarinda North |
| Hawleyville Post Office (historical) | Hawleyville Post Office (historical) | Page | 1027 | Hawleyville |
| Harder's Corner Post Office (historical) | Harder's Corner Post Office (historical) | Page | 974 | Hopkins SW |
| Franklin Grove Post Office (historical) | Franklin Grove Post Office (historical) | Page | 1115 | Coburg |
| Dasie Post Office (historical) | Dasie Post Office (historical) | Page | 1138 | Stanton SW |
| Darwin Post Office (historical) | Darwin Post Office (historical) | Page | 1089 | Stanton SW |
| Morsman Post Office (historical) | Morsman Post Office (historical) | Page | 1047 | Hopkins SW |
| Nyman Post Office (historical) | Nyman Post Office (historical) | Page | 1230 | Red Oak South |
| Binns Post Office (historical) | Binns Post Office (historical) | Page | 1135 | Red Oak South |
| Bingham Post Office (historical) | Bingham Post Office (historical) | Page | 1102 | Bingham |
| Bethesda Post Office (historical) | Bethesda Post Office (historical) | Page | 1217 | Clarinda North |
| Nodaway Forks Post Office (historical) | Nodaway Forks Post Office (historical) | Page | Unknown | |
| Daisy Post Office (historical) | Daisy Post Office (historical) | Page | Unknown | |
| Shenandoah Post Office | Shenandoah Post Office | Page | 974 | Shenandoah East |
| Clarinda Post Office | Clarinda Post Office | Page | 1043 | Clarinda South |
| Yorktown Post Office | Yorktown Post Office | Page | 1083 | Coin |
| Shambaugh Post Office | Shambaugh Post Office | Page | 978 | Clarinda South |
| Northboro Post Office (historical) | Northboro Post Office (historical) | Page | 1086 | Westboro |
| Essex Post Office | Essex Post Office | Page | 994 | Shenandoah East |
| College Springs Post Office | College Springs Post Office | Page | 1152 | Clearmont |
| Coin Post Office | Coin Post Office | Page | 994 | Coin |
| Braddyville Post Office | Braddyville Post Office | Page | 997 | Clearmont |
| Blanchard Post Office | Blanchard Post Office | Page | 1010 | Blanchard |
| Sherman Centre Post Office (historical) | Sherman Centre Post Office (historical) | Montgomery | 1197 | Griswold |
| Ross Grove Post Office (historical) | Ross Grove Post Office (historical) | Montgomery | 1066 | Villisca |
| Stennett Post Office (historical) | Stennett Post Office (historical) | Montgomery | 1142 | Red Oak North |
| Frankfort Post Office (historical) | Frankfort Post Office (historical) | Montgomery | 1289 | Red Oak North |
| Coe's Grove Post Office (historical) | Coe's Grove Post Office (historical) | Montgomery | 1086 | Red Oak North |
| Coburg Post Office (historical) | Coburg Post Office (historical) | Montgomery | 1004 | Coburg |
| Climax Post Office (historical) | Climax Post Office (historical) | Montgomery | 1027 | Coburg |
| Carr's Point Post Office (historical) | Carr's Point Post Office (historical) | Montgomery | 1063 | Coburg |
| Wales Post Office (historical) | Wales Post Office (historical) | Montgomery | 1204 | Wales |
| McPherson Post Office (historical) | McPherson Post Office (historical) | Montgomery | 1112 | Wales |
| Hawthorne Post Office (historical) | Hawthorne Post Office (historical) | Montgomery | 1050 | Wales |
| Wallin Post Office (historical) | Wallin Post Office (historical) | Montgomery | 1286 | Wallin |
| Biddick Post Office (historical) | Biddick Post Office (historical) | Montgomery | 1280 | Wallin |
| Wallace Post Office (historical) | Wallace Post Office (historical) | Montgomery | 1093 | Morton Mills |
| Morton Mills Post Office (historical) | Morton Mills Post Office (historical) | Montgomery | 1089 | Morton Mills |
| Tenville Post Office (historical) | Tenville Post Office (historical) | Montgomery | 1066 | Morton Mills |
| Alix Post Office (historical) | Alix Post Office (historical) | Montgomery | 1099 | Morton Mills |
| Stinson Post Office (historical) | Stinson Post Office (historical) | Montgomery | Unknown | |
| Red Oak Post Office | Red Oak Post Office | Montgomery | 1047 | Red Oak North |
| Villisca Post Office | Villisca Post Office | Montgomery | 1066 | Villisca |
| Elliott Post Office | Elliott Post Office | Montgomery | 1076 | Griswold |
| Stanton Post Office | Stanton Post Office | Montgomery | 1194 | Stanton |
| Bedford Post Office | Bedford Post Office | Taylor | 1125 | Bedford |
| New Market Post Office | New Market Post Office | Taylor | 1234 | New Market |
| Lenox Post Office | Lenox Post Office | Taylor | 1299 | Lenox |
| Clearfield Post Office | Clearfield Post Office | Taylor | 1260 | Clearfield |
| Siam Post Office (historical) | Siam Post Office (historical) | Taylor | 1168 | New Market |
| Platteville Post Office (historical) | Platteville Post Office (historical) | Taylor | 1227 | Conway |
| Lone Office Post Office (historical) | Lone Office Post Office (historical) | Taylor | 1257 | Clearfield |
| Litchfield Post Office (historical) | Litchfield Post Office (historical) | Taylor | 1243 | Merle Junction |
| Lexington Post Office (historical) | Lexington Post Office (historical) | Taylor | 1168 | Bedford |
| Leonard Post Office (historical) | Leonard Post Office (historical) | Taylor | 1263 | Gravity |
| Landis Post Office (historical) | Landis Post Office (historical) | Taylor | 1184 | Hopkins |
| Ladoga Post Office (historical) | Ladoga Post Office (historical) | Taylor | 1220 | Ladoga |
| Henshaw Post Office (historical) | Henshaw Post Office (historical) | Taylor | 1070 | Hawleyville |
| Harmony Post Office (historical) | Harmony Post Office (historical) | Taylor | 1155 | Bedford |
| Guss Post Office (historical) | Guss Post Office (historical) | Taylor | 1204 | Guss |
| Enod Post Office (historical) | Enod Post Office (historical) | Taylor | 1119 | Bedford SW |
| Conway Post Office (historical) | Conway Post Office (historical) | Taylor | 1217 | Conway |
| Brushy Post Office (historical) | Brushy Post Office (historical) | Taylor | 1184 | Ladoga |
| Athelstan Post Office (historical) | Athelstan Post Office (historical) | Taylor | 1073 | Sheridan |
| Platt Post Office (historical) | Platt Post Office (historical) | Taylor | Unknown | |
| Sharpsburg Post Office | Sharpsburg Post Office | Taylor | 1270 | Gravity |
| Blockton Post Office | Blockton Post Office | Taylor | 1115 | Blockton |
| Nevinville Post Office (historical) | Nevinville Post Office (historical) | Adams | 1316 | Nevinville |
| Strand Post Office (historical) | Strand Post Office (historical) | Adams | 1217 | Morton Mills |
| Iveyville Post Office (historical) | Iveyville Post Office (historical) | Adams | 1289 | Brooks |
| Mercer Post Office (historical) | Mercer Post Office (historical) | Adams | 1257 | Corning South |
| Queen City Post Office (historical) | Queen City Post Office (historical) | Adams | 1276 | Corning South |
| Mount Washington Post Office (historical) | Mount Washington Post Office (historical) | Adams | 1247 | Corning North |
| Hoyt Post Office (historical) | Hoyt Post Office (historical) | Adams | 1237 | Carbon |
| Hayes Post Office (historical) | Hayes Post Office (historical) | Adams | 1191 | Carbon |
| Quincy Post Office (historical) | Quincy Post Office (historical) | Adams | 1289 | Carbon |
| Eureka Post Office (historical) | Eureka Post Office (historical) | Adams | 1122 | Carbon |
| Mount Etna Post Office (historical) | Mount Etna Post Office (historical) | Adams | 1135 | Corning North |
| Carl Post Office (historical) | Carl Post Office (historical) | Adams | 1322 | Corning North |
| Carbon Post Office | Carbon Post Office | Adams | 1132 | Carbon |
| Brooks Post Office (historical) | Brooks Post Office (historical) | Adams | 1138 | Brooks |
| Briscoe Post Office (historical) | Briscoe Post Office (historical) | Adams | 1184 | Dewey |
| Williamson Post Office (historical) | Williamson Post Office (historical) | Adams | 1312 | Nevinville |
| Corning Post Office | Corning Post Office | Adams | 1145 | Corning South |
| Prescott Post Office | Prescott Post Office | Adams | 1175 | Prescott |
| Nodaway Post Office | Nodaway Post Office | Adams | 1083 | Villisca |
| Wah-Ta-Wah Post Office (historical) | Wah-Ta-Wah Post Office (historical) | Adair | 1181 | Stuart South |
| McKinley Post Office (historical) | McKinley Post Office (historical) | Adair | 1214 | Stuart South |
| Drakes Post Office (historical) | Drakes Post Office (historical) | Adair | 1302 | Orient |
| Linwood Post Office (historical) | Linwood Post Office (historical) | Adair | 1332 | Canby |
| Hebron Post Office (historical) | Hebron Post Office (historical) | Adair | 1240 | Arbor Hill |
| Nanito Post Office (historical) | Nanito Post Office (historical) | Adair | 1181 | Arbor Hill |
| Stanzel Post Office (historical) | Stanzel Post Office (historical) | Adair | 1204 | Arbor Hill |
| Howe Post Office (historical) | Howe Post Office (historical) | Adair | 1197 | Rosserdale |
| Prussia Post Office (historical) | Prussia Post Office (historical) | Adair | 1345 | Rosserdale |
| Prussia Centre Post Office (historical) | Prussia Centre Post Office (historical) | Adair | 1355 | Fontanelle |
| Berea Post Office (historical) | Berea Post Office (historical) | Adair | 1306 | Fontanelle SW |
| Gilead Post Office (historical) | Gilead Post Office (historical) | Adair | 1289 | Nevinville |
| Avondale Post Office (historical) | Avondale Post Office (historical) | Adair | 1165 | Nevinville |
| Easton Post Office (historical) | Easton Post Office (historical) | Adair | Unknown | |
| Fontanelle Post Office | Fontanelle Post Office | Adair | 1355 | Fontanelle |
| Bridgewater Post Office | Bridgewater Post Office | Adair | 1207 | Bridgewater |
| Adair Post Office | Adair Post Office | Adair | 1467 | Adair North |
| Atlantic Post Office | Atlantic Post Office | Cass | 1178 | Atlantic |
| Wax Post Office (historical) | Wax Post Office (historical) | Cass | 1112 | Griswold NE |
| McDill Post Office (historical) | McDill Post Office (historical) | Cass | Unknown | |
| Reno Post Office (historical) | Reno Post Office (historical) | Cass | 1227 | Grant |
| Lyman Post Office (historical) | Lyman Post Office (historical) | Cass | 1286 | Grant |
| Pymosa Post Office (historical) | Pymosa Post Office (historical) | Cass | 1273 | Wiota |
| Lorah Post Office (historical) | Lorah Post Office (historical) | Cass | 1224 | Wiota |
| Iranistan Post Office (historical) | Iranistan Post Office (historical) | Cass | 1112 | Atlantic SW |
| Gurley Post Office (historical) | Gurley Post Office (historical) | Cass | 1319 | Elk Horn |
| Grove City Post Office (historical) | Grove City Post Office (historical) | Cass | 1204 | Wiota |
| Galion Post Office (historical) | Galion Post Office (historical) | Cass | 1201 | Anita SW |
| Dewey Post Office (historical) | Dewey Post Office (historical) | Cass | 1240 | Dewey |
| Cass Centre Post Office (historical) | Cass Centre Post Office (historical) | Cass | 1266 | Anita SW |
| Lura Post Office (historical) | Lura Post Office (historical) | Cass | Unknown | |
| Griswold Post Office | Griswold Post Office | Cass | 1102 | Griswold |
| Massena Post Office | Massena Post Office | Cass | 1243 | Massena |
| Lewis Post Office | Lewis Post Office | Cass | 1178 | Lewis |
| Cumberland Post Office | Cumberland Post Office | Cass | 1270 | Massena |
| Anita Post Office | Anita Post Office | Cass | 1276 | Anita |
| Wiota Post Office | Wiota Post Office | Cass | 1224 | Wiota |
| Marne Post Office | Marne Post Office | Cass | 1234 | Atlantic |
| Winterset Post Office | Winterset Post Office | Madison | 1122 | Winterset |
| Price Post Office (historical) | Price Post Office (historical) | Madison | 1138 | Winterset |
| Ord Post Office (historical) | Ord Post Office (historical) | Madison | 1184 | Winterset |
| North Branch Post Office (historical) | North Branch Post Office (historical) | Madison | 1056 | Earlham East |
| North Post Office (historical) | North Post Office (historical) | Madison | 1033 | Earlham East |
| Lefever Post Office (historical) | Lefever Post Office (historical) | Madison | 1207 | Macksburg |
| Heaton Post Office (historical) | Heaton Post Office (historical) | Madison | 1010 | Cumming |
| Nem Con Post Office (historical) | Nem Con Post Office (historical) | Madison | 892 | Patterson |
| Gilpin Post Office (historical) | Gilpin Post Office (historical) | Madison | 1020 | Saint Charles NW |
| Pleasant View Post Office (historical) | Pleasant View Post Office (historical) | Madison | 1135 | Pitzer |
| Pitzer Post Office (historical) | Pitzer Post Office (historical) | Madison | 1197 | Pitzer |
| Harrison Post Office (historical) | Harrison Post Office (historical) | Madison | 1168 | Pitzer |
| Charlottsville Post Office (historical) | Charlottsville Post Office (historical) | Madison | 1161 | Pitzer |
| Foster Post Office (historical) | Foster Post Office (historical) | Madison | 1086 | East Peru |
| Peru Post Office (historical) | Peru Post Office (historical) | Madison | 1119 | East Peru |
| Brooklyn Post Office (historical) | Brooklyn Post Office (historical) | Madison | 1122 | East Peru |
| McBride Post Office (historical) | McBride Post Office (historical) | Madison | 1014 | Saint Charles NW |
| Bloomingdale Post Office (historical) | Bloomingdale Post Office (historical) | Madison | 889 | Saint Charles NW |
| Bells Ridge Post Office (historical) | Bells Ridge Post Office (historical) | Madison | 1014 | Saint Charles |
| Hanley Post Office (historical) | Hanley Post Office (historical) | Madison | 938 | Saint Charles |
| Ellsworth Post Office (historical) | Ellsworth Post Office (historical) | Madison | 988 | Saint Charles |
| Clanton Post Office (historical) | Clanton Post Office (historical) | Madison | 1106 | Lorimor North |
| Gear Post Office (historical) | Gear Post Office (historical) | Madison | 1125 | Lorimor North |
| Kasson Post Office (historical) | Kasson Post Office (historical) | Madison | 1171 | Lorimor North |
| McPherson Post Office (historical) | McPherson Post Office (historical) | Madison | 1197 | Lorimor North |
| Barney Post Office (historical) | Barney Post Office (historical) | Madison | 1050 | Lorimor North |
| Banner Post Office (historical) | Banner Post Office (historical) | Madison | 1007 | Patterson |
| Queens Point Post Office (historical) | Queens Point Post Office (historical) | Madison | 909 | Patterson |
| Amazon Post Office (historical) | Amazon Post Office (historical) | Madison | 1086 | Patterson |
| Truro Post Office | Truro Post Office | Madison | 1079 | Truro |
| Saint Charles Post Office | Saint Charles Post Office | Madison | 1066 | Saint Charles |
| Patterson Post Office | Patterson Post Office | Madison | 889 | Patterson |
| Macksburg Post Office | Macksburg Post Office | Madison | 1260 | Macksburg |
| Earlham Post Office | Earlham Post Office | Madison | 1106 | Earlham East |
| Bevington Post Office | Bevington Post Office | Madison | 846 | Saint Charles |
| Polen Post Office (historical) | Polen Post Office (historical) | Ringgold | 1247 | Kent |
| Wanamaker Post Office (historical) | Wanamaker Post Office (historical) | Ringgold | 1076 | Kellerton |
| Silver Street Post Office (historical) | Silver Street Post Office (historical) | Ringgold | 1194 | Tingley NE |
| Mortimer Post Office (historical) | Mortimer Post Office (historical) | Ringgold | 1243 | Shannon City |
| Lesan Post Office (historical) | Lesan Post Office (historical) | Ringgold | 1132 | Mount Ayr |
| Lee Post Office (historical) | Lee Post Office (historical) | Ringgold | 1129 | Pawnee |
| Ingart Post Office (historical) | Ingart Post Office (historical) | Ringgold | 1063 | Blockton SE |
| Kew Post Office (historical) | Kew Post Office (historical) | Ringgold | 1230 | Diagonal |
| Knowlton Post Office (historical) | Knowlton Post Office (historical) | Ringgold | 1142 | Diagonal |
| Goshen Post Office (historical) | Goshen Post Office (historical) | Ringgold | 1204 | Diagonal |
| Flushing Post Office (historical) | Flushing Post Office (historical) | Ringgold | 1145 | Diagonal |
| Estella Post Office (historical) | Estella Post Office (historical) | Ringgold | 1099 | Benton |
| Prairie View Post Office (historical) | Prairie View Post Office (historical) | Ringgold | 1211 | Tingley |
| Blackmore Post Office (historical) | Blackmore Post Office (historical) | Ringgold | 1155 | Ellston |
| Caledonia Post Office (historical) | Caledonia Post Office (historical) | Ringgold | 1155 | Hatfield |
| Ringgold Post Office (historical) | Ringgold Post Office (historical) | Ringgold | 1171 | Hatfield |
| Poyneer Post Office (historical) | Poyneer Post Office (historical) | Ringgold | 1135 | Hatfield |
| Watterson Post Office (historical) | Watterson Post Office (historical) | Ringgold | 1073 | Hatfield |
| Thomas Post Office (historical) | Thomas Post Office (historical) | Ringgold | 1086 | Hatfield |
| Shawler Post Office (historical) | Shawler Post Office (historical) | Ringgold | Unknown | |
| Riley Post Office (historical) | Riley Post Office (historical) | Ringgold | Unknown | |
| Quinns Grove Post Office (historical) | Quinns Grove Post Office (historical) | Ringgold | Unknown | |
| Providence Post Office (historical) | Providence Post Office (historical) | Ringgold | Unknown | |
| Custer Post Office (historical) | Custer Post Office (historical) | Ringgold | Unknown | |
| Mount Ayr Post Office | Mount Ayr Post Office | Ringgold | 1227 | Mount Ayr |
| Diagonal Post Office | Diagonal Post Office | Ringgold | 1158 | Diagonal |
| Tingley Post Office | Tingley Post Office | Ringgold | 1257 | Tingley |
| Maloy Post Office (historical) | Maloy Post Office (historical) | Ringgold | 1106 | Maloy |
| Kellerton Post Office | Kellerton Post Office | Ringgold | 1204 | Kellerton |
| Delphos Post Office | Delphos Post Office | Ringgold | 1138 | Benton |
| Benton Post Office | Benton Post Office | Ringgold | 1083 | Benton |
| Ellston Post Office | Ellston Post Office | Ringgold | 1230 | Ellston |
| Beaconsfield Post Office | Beaconsfield Post Office | Ringgold | 1217 | Ellston |
| Creston Post Office | Creston Post Office | Union | 1302 | Creston East |
| Kings Post Office (historical) | Kings Post Office (historical) | Union | 1207 | Lorimor South |
| Lee Post Office (historical) | Lee Post Office (historical) | Union | 1237 | Zion |
| Monette Post Office (historical) | Monette Post Office (historical) | Union | 1237 | Lorimor South |
| New Hope Post Office (historical) | New Hope Post Office (historical) | Union | 1230 | Lorimor South |
| Myers Post Office (historical) | Myers Post Office (historical) | Union | 1302 | Creston East |
| Philo Post Office (historical) | Philo Post Office (historical) | Union | 1302 | Creston East |
| Olio Post Office (historical) | Olio Post Office (historical) | Union | 1024 | Tingley NE |
| Olivet Post Office (historical) | Olivet Post Office (historical) | Union | 1266 | Arispe |
| Patriot Post Office (historical) | Patriot Post Office (historical) | Union | 1184 | Lorimor South |
| Petersville Post Office (historical) | Petersville Post Office (historical) | Union | 1132 | Lorimor South |
| Platt Post Office (historical) | Platt Post Office (historical) | Union | 1194 | Creston West |
| Shepard Post Office (historical) | Shepard Post Office (historical) | Union | 1165 | Arispe |
| Spaulding Post Office (historical) | Spaulding Post Office (historical) | Union | 1345 | Zion |
| Talmage Post Office (historical) | Talmage Post Office (historical) | Union | 1073 | Lorimor South |
| Thayer Post Office | Thayer Post Office | Union | 1106 | Lorimor South |
| Union City Post Office (historical) | Union City Post Office (historical) | Union | 1270 | Kent |
| Coelo Post Office (historical) | Coelo Post Office (historical) | Union | 1165 | Kent |
| Shannon City Post Office | Shannon City Post Office | Union | 1224 | Shannon City |
| Lorimor Post Office | Lorimor Post Office | Union | 1230 | Lorimor North |
| Kent Post Office | Kent Post Office | Union | 1207 | Kent |
| Cromwell Post Office | Cromwell Post Office | Union | 1289 | Creston West |
| Arispe Post Office | Arispe Post Office | Union | 1266 | Arispe |
| Afton Post Office | Afton Post Office | Union | 1217 | Afton |
| Westerville Post Office (historical) | Westerville Post Office (historical) | Decatur | 991 | Grand River |
| Woodland Post Office (historical) | Woodland Post Office (historical) | Decatur | 1086 | Woodland |
| Tuskeega Post Office (historical) | Tuskeega Post Office (historical) | Decatur | 1175 | Lamoni North |
| Terre Haute Post Office (historical) | Terre Haute Post Office (historical) | Decatur | 928 | Davis City |
| Spring Valley Post Office (historical) | Spring Valley Post Office (historical) | Decatur | 906 | Pleasanton |
| Prairieville Post Office (historical) | Prairieville Post Office (historical) | Decatur | 1148 | Van Wert |
| Pleasanton Post Office (historical) | Pleasanton Post Office (historical) | Decatur | 1093 | Pleasanton |
| Morgan Post Office (historical) | Morgan Post Office (historical) | Decatur | 974 | Lineville |
| Little River Post Office (historical) | Little River Post Office (historical) | Decatur | 951 | Pleasanton |
| Highbrier Post Office (historical) | Highbrier Post Office (historical) | Decatur | 1053 | Leon |
| Highpoint Post Office (historical) | Highpoint Post Office (historical) | Decatur | 1099 | Garden Grove |
| Funks Mills Post Office (historical) | Funks Mills Post Office (historical) | Decatur | 1063 | Grand River |
| Fierce Post Office (historical) | Fierce Post Office (historical) | Decatur | 1119 | Van Wert |
| Elk Post Office (historical) | Elk Post Office (historical) | Decatur | 991 | Lamoni North |
| Dekalb Post Office (historical) | Dekalb Post Office (historical) | Decatur | 971 | Van Wert |
| Crown Post Office (historical) | Crown Post Office (historical) | Decatur | 1099 | Garden Grove SW |
| Cora Post Office (historical) | Cora Post Office (historical) | Decatur | 1070 | Lamoni South |
| Burrell Post Office (historical) | Burrell Post Office (historical) | Decatur | 912 | Davis City |
| Bracewell Post Office (historical) | Bracewell Post Office (historical) | Decatur | 1060 | Leon |
| Blockly Post Office (historical) | Blockly Post Office (historical) | Decatur | 1004 | Davis City |
| Leon Post Office | Leon Post Office | Decatur | 1115 | Leon |
| Lamoni Post Office | Lamoni Post Office | Decatur | 1138 | Lamoni South |
| Weldon Post Office | Weldon Post Office | Decatur | 1152 | Weldon |
| Van Wert Post Office | Van Wert Post Office | Decatur | 1165 | Van Wert |
| Garden Grove Post Office | Garden Grove Post Office | Decatur | 1109 | Garden Grove |
| Decatur Post Office | Decatur Post Office | Decatur | 1145 | Davis City |
| Davis City Post Office | Davis City Post Office | Decatur | 928 | Davis City |
| Le Roy Post Office (historical) | Le Roy Post Office (historical) | Decatur | 1115 | Le Roy |
| New Buda Post Office (historical) | New Buda Post Office (historical) | Decatur | 928 | Akron |
| Riley Post Office (historical) | Riley Post Office (historical) | Clarke | 1056 | Hopeville |
| Milford Post Office (historical) | Milford Post Office (historical) | Clarke | 1076 | Murray |
| Middleport Post Office (historical) | Middleport Post Office (historical) | Clarke | 1056 | Woodburn |
| Prairie Grove Post Office (historical) | Prairie Grove Post Office (historical) | Clarke | 1040 | Truro |
| Laporte Post Office (historical) | Laporte Post Office (historical) | Clarke | 1165 | East Peru |
| Jay Post Office (historical) | Jay Post Office (historical) | Clarke | 1060 | Woodburn |
| Hopeville Post Office (historical) | Hopeville Post Office (historical) | Clarke | 1191 | Hopeville |
| Liberty Post Office (historical) | Liberty Post Office (historical) | Clarke | 1060 | New Virginia |
| Freehold Post Office (historical) | Freehold Post Office (historical) | Clarke | 1138 | Lacelle |
| Folger Post Office (historical) | Folger Post Office (historical) | Clarke | 1043 | New Virginia |
| Nortonville Post Office (historical) | Nortonville Post Office (historical) | Clarke | 1079 | Jamison |
| Jamison Post Office (historical) | Jamison Post Office (historical) | Clarke | 965 | Jamison |
| Groveland Post Office (historical) | Groveland Post Office (historical) | Clarke | 1161 | Lacelle |
| Leslie Post Office (historical) | Leslie Post Office (historical) | Clarke | 1175 | Lacelle |
| Lacelle Post Office (historical) | Lacelle Post Office (historical) | Clarke | 1132 | Lacelle |
| White Breast Post Office (historical) | White Breast Post Office (historical) | Clarke | 1158 | Lacelle |
| Shelby Post Office (historical) | Shelby Post Office (historical) | Clarke | 1099 | Weldon |
| Jack Creek Post Office (historical) | Jack Creek Post Office (historical) | Clarke | 1063 | Weldon |
| Bartlettville Post Office (historical) | Bartlettville Post Office (historical) | Clarke | 1086 | Weldon |
| Balaka Post Office (historical) | Balaka Post Office (historical) | Clarke | 1004 | Osceola |
| La Harp Post Office (historical) | La Harp Post Office (historical) | Clarke | Unknown | |
| Jackson Post Office (historical) | Jackson Post Office (historical) | Clarke | Unknown | |
| Bell Post Office (historical) | Bell Post Office (historical) | Clarke | Unknown | |
| Osceola Post Office | Osceola Post Office | Clarke | 1142 | Osceola |
| Woodburn Post Office | Woodburn Post Office | Clarke | 968 | Woodburn |
| Murray Post Office | Murray Post Office | Clarke | 1217 | Murray |
| Smyrna Post Office (historical) | Smyrna Post Office (historical) | Clarke | 1093 | Le Roy |
| Planeville Post Office (historical) | Planeville Post Office (historical) | Warren | 807 | Milo |
| Wilmington Post Office (historical) | Wilmington Post Office (historical) | Warren | 863 | Hartford |
| White Oak Point Post Office (historical) | White Oak Point Post Office (historical) | Warren | 856 | Martensdale |
| Sutton Post Office (historical) | Sutton Post Office (historical) | Warren | 945 | Hartford |
| Summerset Post Office (historical) | Summerset Post Office (historical) | Warren | 807 | Scotch Ridge |
| Medford Post Office (historical) | Medford Post Office (historical) | Warren | 965 | Martensdale |
| Oswego Post Office (historical) | Oswego Post Office (historical) | Warren | 978 | Martensdale |
| Montpelier Post Office (historical) | Montpelier Post Office (historical) | Warren | 994 | Cumming |
| Lothrop Post Office (historical) | Lothrop Post Office (historical) | Warren | 823 | Norwalk |
| Loretto Post Office (historical) | Loretto Post Office (historical) | Warren | 846 | Norwalk |
| Lida Post Office (historical) | Lida Post Office (historical) | Warren | 830 | Norwalk |
| Latimer Post Office (historical) | Latimer Post Office (historical) | Warren | 860 | Martensdale |
| Wick Post Office (historical) | Wick Post Office (historical) | Warren | 889 | Martensdale |
| Wisconsin Post Office (historical) | Wisconsin Post Office (historical) | Warren | 968 | Milo |
| Sandyville Post Office (historical) | Sandyville Post Office (historical) | Warren | 938 | Milo |
| Hammondsburgh Post Office (historical) | Hammondsburgh Post Office (historical) | Warren | 961 | Milo |
| Medora Post Office (historical) | Medora Post Office (historical) | Warren | 883 | Medora |
| Handsome View Post Office (historical) | Handsome View Post Office (historical) | Warren | 1014 | Medora |
| Friends Grove Post Office (historical) | Friends Grove Post Office (historical) | Warren | 873 | Hartford |
| Spring Hill Post Office (historical) | Spring Hill Post Office (historical) | Warren | 820 | Norwalk |
| Ford Post Office (historical) | Ford Post Office (historical) | Warren | 758 | Hartford |
| Felix Post Office (historical) | Felix Post Office (historical) | Warren | 951 | Beech |
| Orillia Post Office (historical) | Orillia Post Office (historical) | Warren | 961 | Des Moines SW |
| Dorrville Post Office (historical) | Dorrville Post Office (historical) | Warren | 1083 | Truro |
| Derrough Post Office (historical) | Derrough Post Office (historical) | Warren | 961 | Indianola |
| Cool Post Office (historical) | Cool Post Office (historical) | Warren | 1020 | Medora |
| Conger Post Office (historical) | Conger Post Office (historical) | Warren | 853 | Saint Charles |
| Clarkson Post Office (historical) | Clarkson Post Office (historical) | Warren | 764 | Rising Sun |
| Churchville | Churchville | Warren | 971 | Cumming |
| Motor Post Office (historical) | Motor Post Office (historical) | Warren | 968 | Beech |
| Beech Post Office (historical) | Beech Post Office (historical) | Warren | 909 | Beech |
| Indianola Post Office | Indianola Post Office | Warren | 958 | Indianola |
| Norwalk Post Office | Norwalk Post Office | Warren | 951 | Norwalk |
| Saint Marys Post Office | Saint Marys Post Office | Warren | 1027 | Martensdale |
| Prole Post Office | Prole Post Office | Warren | 978 | Norwalk |
| Palmyra Post Office (historical) | Palmyra Post Office (historical) | Warren | 925 | Hartford |
| Milo Post Office | Milo Post Office | Warren | 971 | Milo |
| Lacona Post Office | Lacona Post Office | Warren | 860 | Lacona |
| New Virginia Post Office | New Virginia Post Office | Warren | 1076 | New Virginia |
| Martensdale Post Office | Martensdale Post Office | Warren | 827 | Martensdale |
| Liberty Center Post Office | Liberty Center Post Office | Warren | 1030 | Lacona |
| Hartford Post Office | Hartford Post Office | Warren | 886 | Hartford |
| Cumming Post Office | Cumming Post Office | Warren | 984 | Cumming |
| Carlisle Post Office | Carlisle Post Office | Warren | 797 | Hartford |
| Ackworth Post Office | Ackworth Post Office | Warren | 902 | Milo |
| Greenfield Post Office | Greenfield Post Office | Adair | 1371 | Greenfield |
| Kemigala Post Office (historical) | Kemigala Post Office (historical) | Appanoose | 833 | Coatsville |
| Williamston Post Office (historical) | Williamston Post Office (historical) | Appanoose | 965 | Moulton |
| Pearl City Post Office (historical) | Pearl City Post Office (historical) | Appanoose | 994 | Mendota |
| Welland Post Office (historical) | Welland Post Office (historical) | Appanoose | 1040 | Lake Thunderhead |
| Walsh Post Office (historical) | Walsh Post Office (historical) | Appanoose | 1047 | Seymour East |
| Harkes Post Office (historical) | Harkes Post Office (historical) | Appanoose | 1007 | Seymour East |
| Johnstown Post Office (historical) | Johnstown Post Office (historical) | Appanoose | 1033 | Seymour East |
| Marsdenville Post Office (historical) | Marsdenville Post Office (historical) | Appanoose | 991 | Seymour East |
| Jerome Post Office (historical) | Jerome Post Office (historical) | Appanoose | 1037 | Seymour East |
| Iconium Post Office (historical) | Iconium Post Office (historical) | Appanoose | 994 | Iconium |
| Well's Mills Post Office (historical) | Well's Mills Post Office (historical) | Appanoose | 817 | Coatsville |
| Dean Post Office (historical) | Dean Post Office (historical) | Appanoose | 830 | Moulton |
| Ray Post Office (historical) | Ray Post Office (historical) | Appanoose | 988 | Hiattsville |
| Darbyville Post Office (historical) | Darbyville Post Office (historical) | Appanoose | 883 | Hiattsville |
| Hiattsville Post Office (historical) | Hiattsville Post Office (historical) | Appanoose | 991 | Hiattsville |
| Memphis Post Office (historical) | Memphis Post Office (historical) | Appanoose | 997 | Plano |
| Niles Post Office (historical) | Niles Post Office (historical) | Appanoose | 938 | Plano |
| Garfield Post Office (historical) | Garfield Post Office (historical) | Appanoose | 1004 | Plano |
| Griffinsville Post Office (historical) | Griffinsville Post Office (historical) | Appanoose | 978 | Plano |
| Milledgeville Post Office (historical) | Milledgeville Post Office (historical) | Appanoose | 988 | Plano |
| Calhoun Post Office (historical) | Calhoun Post Office (historical) | Appanoose | 988 | Mystic |
| Numa Post Office (historical) | Numa Post Office (historical) | Appanoose | 1033 | Centerville West |
| Hibbsville Post Office (historical) | Hibbsville Post Office (historical) | Appanoose | 1007 | Centerville West |
| Sharon Post Office (historical) | Sharon Post Office (historical) | Appanoose | 899 | Centerville East |
| Sedan Post Office (historical) | Sedan Post Office (historical) | Appanoose | 945 | Centerville East |
| Caldwell Post Office (historical) | Caldwell Post Office (historical) | Appanoose | 978 | Centerville East |
| Forbush Post Office (historical) | Forbush Post Office (historical) | Appanoose | 984 | Mystic |
| Diamond Post Office (historical) | Diamond Post Office (historical) | Appanoose | 951 | Mystic |
| Walnut City Post Office (historical) | Walnut City Post Office (historical) | Appanoose | 997 | Mystic |
| Rathbun Post Office (historical) | Rathbun Post Office (historical) | Appanoose | 938 | Mystic |
| Clarkdale Post Office (historical) | Clarkdale Post Office (historical) | Appanoose | 955 | Mystic |
| Brazil Post Office (historical) | Brazil Post Office (historical) | Appanoose | 994 | Mystic |
| Bellair Post Office (historical) | Bellair Post Office (historical) | Appanoose | 1014 | Centerville West |
| Coal City Post Office (historical) | Coal City Post Office (historical) | Appanoose | 837 | Coatsville |
| Centerville Post Office | Centerville Post Office | Appanoose | 1007 | Centerville West |
| Moravia Post Office | Moravia Post Office | Appanoose | 997 | Moravia |
| Moulton Post Office | Moulton Post Office | Appanoose | 994 | Moulton |
| Mystic Post Office | Mystic Post Office | Appanoose | 899 | Mystic |
| Unionville Post Office | Unionville Post Office | Appanoose | 958 | Unionville |
| Udell Post Office | Udell Post Office | Appanoose | 997 | Unionville |
| Plano Post Office | Plano Post Office | Appanoose | 1033 | Plano |
| Exline Post Office | Exline Post Office | Appanoose | 1020 | Centerville East |
| Cincinnati Post Office | Cincinnati Post Office | Appanoose | 1037 | Centerville West |
| Wanlock Post Office (historical) | Wanlock Post Office (historical) | Monroe | 837 | Hiteman |
| Thompsonville Post Office (historical) | Thompsonville Post Office (historical) | Monroe | 915 | Attica |
| Osprey Post Office (historical) | Osprey Post Office (historical) | Monroe | 1004 | Melrose |
| Hynes Post Office (historical) | Hynes Post Office (historical) | Monroe | 873 | Avery |
| White Post Office (historical) | White Post Office (historical) | Monroe | 797 | Buxton |
| Whiteburg Post Office (historical) | Whiteburg Post Office (historical) | Monroe | 787 | Buxton |
| Tyrone Post Office (historical) | Tyrone Post Office (historical) | Monroe | 850 | Iconium |
| Urbanna City Post Office (historical) | Urbanna City Post Office (historical) | Monroe | 935 | Blakesburg |
| Hummaconna Post Office (historical) | Hummaconna Post Office (historical) | Monroe | 942 | Blakesburg |
| Halfway Prairie Post Office (historical) | Halfway Prairie Post Office (historical) | Monroe | 738 | Avery |
| Rexfield Post Office (historical) | Rexfield Post Office (historical) | Monroe | 873 | Hiteman |
| Hiteman Post Office (historical) | Hiteman Post Office (historical) | Monroe | 778 | Hiteman |
| Ward Post Office (historical) | Ward Post Office (historical) | Monroe | 925 | Hiteman |
| Georgetown Post Office (historical) | Georgetown Post Office (historical) | Monroe | 984 | Hiteman |
| Selection Post Office (historical) | Selection Post Office (historical) | Monroe | 948 | Moravia |
| Hocking Post Office (historical) | Hocking Post Office (historical) | Monroe | 856 | Moravia |
| Hilton Post Office (historical) | Hilton Post Office (historical) | Monroe | 968 | Moravia |
| Foster Post Office (historical) | Foster Post Office (historical) | Monroe | 942 | Moravia |
| Enon Post Office (historical) | Enon Post Office (historical) | Monroe | 840 | Blakesburg |
| Consol Post Office (historical) | Consol Post Office (historical) | Monroe | 787 | Weller |
| Chisholm Post Office (historical) | Chisholm Post Office (historical) | Monroe | 896 | Avery |
| Cedar Mines Post Office (historical) | Cedar Mines Post Office (historical) | Monroe | 860 | Albia |
| Buxton Post Office (historical) | Buxton Post Office (historical) | Monroe | 774 | Buxton |
| Bucknell Post Office (historical) | Bucknell Post Office (historical) | Monroe | 919 | Weller |
| Brompton Post Office (historical) | Brompton Post Office (historical) | Monroe | 958 | Blakesburg |
| Fraker Post Office (historical) | Fraker Post Office (historical) | Monroe | 935 | Albia |
| Cuba Post Office (historical) | Cuba Post Office (historical) | Monroe | 860 | Avery |
| Fredric Post Office (historical) | Fredric Post Office (historical) | Monroe | 801 | Avery |
| Lockman Post Office (historical) | Lockman Post Office (historical) | Monroe | 764 | Avery |
| Avery Post Office (historical) | Avery Post Office (historical) | Monroe | 906 | Avery |
| Lindville Post Office (historical) | Lindville Post Office (historical) | Monroe | Unknown | |
| Henn Post Office (historical) | Henn Post Office (historical) | Monroe | Unknown | |
| Gray's Creek Post Office (historical) | Gray's Creek Post Office (historical) | Monroe | Unknown | |
| Albia Post Office | Albia Post Office | Monroe | 961 | Albia |
| Melrose Post Office | Melrose Post Office | Monroe | 892 | Melrose |
| Lovilia Post Office | Lovilia Post Office | Monroe | 915 | Lovilia |
| Warsaw Post Office (historical) | Warsaw Post Office (historical) | Wayne | 1079 | Powersville |
| Una Post Office (historical) | Una Post Office (historical) | Wayne | 1040 | Confidence |
| Sewal Post Office (historical) | Sewal Post Office (historical) | Wayne | 1109 | Allerton |
| Saxon Post Office (historical) | Saxon Post Office (historical) | Wayne | 1093 | Humeston |
| Ovid Post Office (historical) | Ovid Post Office (historical) | Wayne | 1060 | Corydon |
| Orlando Post Office (historical) | Orlando Post Office (historical) | Wayne | 1079 | Humeston |
| New York Post Office (historical) | New York Post Office (historical) | Wayne | 1056 | Corydon |
| Millerton Post Office (historical) | Millerton Post Office (historical) | Wayne | 1073 | Corydon |
| Lucerne Post Office (historical) | Lucerne Post Office (historical) | Wayne | 1056 | Humeston |
| Lewisburg Post Office (historical) | Lewisburg Post Office (historical) | Wayne | 1093 | Garden Grove |
| Kniffin Post Office (historical) | Kniffin Post Office (historical) | Wayne | 1076 | Seymour West |
| Hodge Post Office (historical) | Hodge Post Office (historical) | Wayne | 1102 | Clio |
| Harvard Post Office (historical) | Harvard Post Office (historical) | Wayne | 1096 | Allerton |
| Confidence Post Office (historical) | Confidence Post Office (historical) | Wayne | 1033 | Confidence |
| Clinton Center Post Office (historical) | Clinton Center Post Office (historical) | Wayne | 1066 | Cleopatra |
| Cambria Post Office (historical) | Cambria Post Office (historical) | Wayne | 1093 | Humeston |
| Big Spring Post Office (historical) | Big Spring Post Office (historical) | Wayne | 1056 | Woodland |
| Bethlehem Post Office (historical) | Bethlehem Post Office (historical) | Wayne | 1063 | Confidence |
| Bentonville Post Office (historical) | Bentonville Post Office (historical) | Wayne | 1093 | Corydon |
| Wayne Cross Roads Post Office (historical) | Wayne Cross Roads Post Office (historical) | Wayne | Unknown | |
| South Fork Post Office (historical) | South Fork Post Office (historical) | Wayne | Unknown | |
| Corydon Post Office | Corydon Post Office | Wayne | 1093 | Corydon |
| Humeston Post Office | Humeston Post Office | Wayne | 1109 | Humeston |
| Seymour Post Office | Seymour Post Office | Wayne | 1073 | Seymour East |
| Promise City Post Office | Promise City Post Office | Wayne | 1053 | Seymour West |
| Lineville Post Office | Lineville Post Office | Wayne | 1093 | Lineville |
| Clio Post Office | Clio Post Office | Wayne | 1115 | Clio |
| Allerton Post Office | Allerton Post Office | Wayne | 1099 | Allerton |
| Tallahoma Post Office (historical) | Tallahoma Post Office (historical) | Lucas | 1020 | Lucas |
| Oakley Post Office (historical) | Oakley Post Office (historical) | Lucas | 978 | Chariton |
| Last Chance Post Office (historical) | Last Chance Post Office (historical) | Lucas | 1073 | Le Roy |
| La Grange Post Office (historical) | La Grange Post Office (historical) | Lucas | 1017 | Weller |
| Purdy Post Office (historical) | Purdy Post Office (historical) | Lucas | 906 | Melcher-Dallas |
| Greenville Post Office (historical) | Greenville Post Office (historical) | Lucas | 1024 | Melrose |
| Zero Post Office (historical) | Zero Post Office (historical) | Lucas | 942 | Russell |
| Freeland Post Office (historical) | Freeland Post Office (historical) | Lucas | 1060 | Derby |
| Warren Centre Post Office (historical) | Warren Centre Post Office (historical) | Lucas | 1070 | Derby |
| Milan Post Office (historical) | Milan Post Office (historical) | Lucas | 1047 | Corydon NE |
| Freedom Post Office (historical) | Freedom Post Office (historical) | Lucas | 1027 | Corydon NE |
| Cleveland Post Office (historical) | Cleveland Post Office (historical) | Lucas | 925 | Woodburn |
| West Alexander Post Office (historical) | West Alexander Post Office (historical) | Lucas | 1037 | Olmitz |
| Tipperary Post Office (historical) | Tipperary Post Office (historical) | Lucas | 965 | Olmitz |
| Olmitz Post Office (historical) | Olmitz Post Office (historical) | Lucas | 830 | Olmitz |
| Ola Post Office (historical) | Ola Post Office (historical) | Lucas | 1001 | Olmitz |
| Maceville Post Office (historical) | Maceville Post Office (historical) | Lucas | 883 | Olmitz |
| Irish Grove Post Office (historical) | Irish Grove Post Office (historical) | Lucas | 978 | Olmitz |
| Cedar Grove Post Office (historical) | Cedar Grove Post Office (historical) | Lucas | 1004 | Olmitz |
| Bucyrus Post Office (historical) | Bucyrus Post Office (historical) | Lucas | 873 | Chariton |
| Earle Post Office (historical) | Earle Post Office (historical) | Lucas | 1096 | Derby |
| Derby Post Office | Derby Post Office | Lucas | 1079 | Derby |
| Argo Post Office (historical) | Argo Post Office (historical) | Lucas | 1070 | Derby |
| Timos Post Office (historical) | Timos Post Office (historical) | Lucas | Unknown | |
| Chariton Post Office | Chariton Post Office | Lucas | 1040 | Chariton |
| Lucas Post Office | Lucas Post Office | Lucas | 892 | Lucas |
| Williamson Post Office | Williamson Post Office | Lucas | 1024 | Chariton |
| Russell Post Office | Russell Post Office | Lucas | 1030 | Russell |
| Gainford Post Office (historical) | Gainford Post Office (historical) | Mahaska | 843 | University Park |
| Des Moines City Post Office (historical) | Des Moines City Post Office (historical) | Mahaska | 659 | Eddyville |
| Carbondale Post Office (historical) | Carbondale Post Office (historical) | Mahaska | 768 | University Park |
| Blythe Post Office (historical) | Blythe Post Office (historical) | Mahaska | 741 | University Park |
| Oneska Post Office (historical) | Oneska Post Office (historical) | Mahaska | 814 | Gibson |
| Brock Post Office (historical) | Brock Post Office (historical) | Mahaska | 856 | Buxton |
| Rex Post Office (historical) | Rex Post Office (historical) | Mahaska | 764 | Buxton |
| Comet Post Office (historical) | Comet Post Office (historical) | Mahaska | 794 | University Park |
| Union Mills Post Office (historical) | Union Mills Post Office (historical) | Mahaska | 764 | Union Mills |
| Stoneridge Post Office (historical) | Stoneridge Post Office (historical) | Mahaska | 748 | Gibson |
| Tioga Post Office (historical) | Tioga Post Office (historical) | Mahaska | 797 | Rose Hill |
| Peoria Post Office (historical) | Peoria Post Office (historical) | Mahaska | 787 | Peoria |
| Farmersville Post Office (historical) | Farmersville Post Office (historical) | Mahaska | 735 | Oskaloosa |
| Olivet Post Office (historical) | Olivet Post Office (historical) | Mahaska | 801 | Leighton |
| Lacey Post Office (historical) | Lacey Post Office (historical) | Mahaska | 850 | New Sharon |
| Indianapolis Post Office (historical) | Indianapolis Post Office (historical) | Mahaska | 794 | Gibson |
| Wright Post Office (historical) | Wright Post Office (historical) | Mahaska | 843 | Kirkville |
| Lostcreek Post Office (historical) | Lostcreek Post Office (historical) | Mahaska | 771 | Kirkville |
| Pekay Post Office (historical) | Pekay Post Office (historical) | Mahaska | 787 | Kirkville |
| Muchakinock Post Office (historical) | Muchakinock Post Office (historical) | Mahaska | 801 | Eddyville |
| Truax Post Office (historical) | Truax Post Office (historical) | Mahaska | 732 | Eddyville |
| Henness Post Office (historical) | Henness Post Office (historical) | Mahaska | 771 | Eddyville |
| Excelsior Post Office (historical) | Excelsior Post Office (historical) | Mahaska | 787 | Eddyville |
| Evans Post Office (historical) | Evans Post Office (historical) | Mahaska | 728 | Oskaloosa |
| Cricket Post Office (historical) | Cricket Post Office (historical) | Mahaska | 735 | Buxton |
| Bernina Post Office (historical) | Bernina Post Office (historical) | Mahaska | 755 | Peoria |
| Belle Fountain Post Office (historical) | Belle Fountain Post Office (historical) | Mahaska | 728 | Leighton |
| Auburn Post Office (historical) | Auburn Post Office (historical) | Mahaska | 699 | Leighton |
| Scott Post Office (historical) | Scott Post Office (historical) | Mahaska | Unknown | |
| Laredo Post Office (historical) | Laredo Post Office (historical) | Mahaska | Unknown | |
| Fishville Post Offcie (historical) | Fishville Post Offcie (historical) | Mahaska | Unknown | |
| Concert Post Office (historical) | Concert Post Office (historical) | Mahaska | Unknown | |
| Cherry Post Office (historical) | Cherry Post Office (historical) | Mahaska | Unknown | |
| Oskaloosa Post Office | Oskaloosa Post Office | Mahaska | 833 | Oskaloosa |
| University Park Post Office | University Park Post Office | Mahaska | 817 | University Park |
| Taintor Post Office (historical) | Taintor Post Office (historical) | Mahaska | 883 | Searsboro |
| Rose Hill Post Office | Rose Hill Post Office | Mahaska | 814 | Rose Hill |
| New Sharon Post Office | New Sharon Post Office | Mahaska | 876 | New Sharon |
| Leighton Post Office | Leighton Post Office | Mahaska | 774 | Leighton |
| Fremont Post Office | Fremont Post Office | Mahaska | 840 | Fremont |
| Cedar Post Office | Cedar Post Office | Mahaska | 814 | Kirkville |
| Beacon Post Office | Beacon Post Office | Mahaska | 761 | Oskaloosa |
| Barnes City Post Office | Barnes City Post Office | Mahaska | 909 | Barnes City |
| Willard Post Office (historical) | Willard Post Office (historical) | Wapello | 810 | Chillicothe |
| Tunis Post Office (historical) | Tunis Post Office (historical) | Wapello | 778 | Farson |
| Godfrey Post Office (historical) | Godfrey Post Office (historical) | Wapello | 725 | Ottumwa North |
| Point Isabelle Post Office (historical) | Point Isabelle Post Office (historical) | Wapello | 853 | Ottumwa South |
| Ormanville Post Office (historical) | Ormanville Post Office (historical) | Wapello | 741 | Ottumwa South |
| Rutledge Post Office (historical) | Rutledge Post Office (historical) | Wapello | 837 | Ottumwa North |
| Port Richmond Post Office (historical) | Port Richmond Post Office (historical) | Wapello | 653 | Ottumwa North |
| Keb Post Office (historical) | Keb Post Office (historical) | Wapello | 784 | Ottumwa North |
| Yampa Post Office (historical) | Yampa Post Office (historical) | Wapello | 781 | Abingdon |
| Farson Post Office (historical) | Farson Post Office (historical) | Wapello | 797 | Farson |
| Dahlonega Post Office (historical) | Dahlonega Post Office (historical) | Wapello | 827 | Farson |
| Bladensburg Post Office (historical) | Bladensburg Post Office (historical) | Wapello | 761 | Abingdon |
| Fountain Springs Post Office (historical) | Fountain Springs Post Office (historical) | Wapello | 696 | Chillicothe |
| Christiansburgh Post Office (historical) | Christiansburgh Post Office (historical) | Wapello | 869 | Chillicothe |
| Happy Hollow Post Office (historical) | Happy Hollow Post Office (historical) | Wapello | 663 | Chillicothe |
| Bidwell Post Office (historical) | Bidwell Post Office (historical) | Wapello | 718 | Chillicothe |
| Bearcreek Post Office (historical) | Bearcreek Post Office (historical) | Wapello | 712 | Ottumwa North |
| Ashland Post Office (historical) | Ashland Post Office (historical) | Wapello | 787 | Eldon |
| Alpine Post Office (historical) | Alpine Post Office (historical) | Wapello | 630 | Agency |
| Village Post Office (historical) | Village Post Office (historical) | Wapello | Unknown | |
| Point Pleasant Post Office (historical) | Point Pleasant Post Office (historical) | Wapello | Unknown | |
| Morton Post Office (historical) | Morton Post Office (historical) | Wapello | Unknown | |
| Nanisee Post Office (historical) | Nanisee Post Office (historical) | Wapello | Unknown | |
| Greene Post Office (historical) | Greene Post Office (historical) | Wapello | Unknown | |
| Cynthiana Post Office (historical) | Cynthiana Post Office (historical) | Wapello | Unknown | |
| Cleonville Post Office (historical) | Cleonville Post Office (historical) | Wapello | Unknown | |
| Appanoose Post Office (historical) | Appanoose Post Office (historical) | Wapello | Unknown | |
| Ottumwa Post Office | Ottumwa Post Office | Wapello | 653 | Ottumwa North |
| Eldon Post Office | Eldon Post Office | Wapello | 620 | Eldon |
| Kirkville Post Office | Kirkville Post Office | Wapello | 850 | Kirkville |
| Chillicothe Post Office | Chillicothe Post Office | Wapello | 686 | Chillicothe |
| Blakesburg Post Office | Blakesburg Post Office | Wapello | 912 | Blakesburg |
| Agency Post Office | Agency Post Office | Wapello | 814 | Agency |
| Haydock Post Office (historical) | Haydock Post Office (historical) | Monroe | 830 | Weller |
| Ovid Post Office (historical) | Ovid Post Office (historical) | Taylor | 1063 | Hopkins |
| Selma Post Office (historical) | Selma Post Office (historical) | Wayne | 1102 | Le Roy |
| Weston Post Office (historical) | Weston Post Office (historical) | Marion | 928 | Knoxville SW |
| Howell Post Office (historical) | Howell Post Office (historical) | Marion | 810 | Pella |
| Fifield Post Office (historical) | Fifield Post Office (historical) | Marion | 751 | Otley |
| Percy Post Office (historical) | Percy Post Office (historical) | Marion | 748 | Pleasantville |
| Morgan Valley Post Office (historical) | Morgan Valley Post Office (historical) | Marion | 751 | Pleasantville |
| Wheeling Post Office (historical) | Wheeling Post Office (historical) | Marion | 938 | Pleasantville |
| Rizors Post Office (historical) | Rizors Post Office (historical) | Marion | 889 | Knoxville |
| Pickway Post Office (historical) | Pickway Post Office (historical) | Marion | 745 | Knoxville NW |
| Paran City Post Office (historical) | Paran City Post Office (historical) | Marion | 745 | Knoxville NW |
| Pershing Post Office (historical) | Pershing Post Office (historical) | Marion | 899 | Knoxville |
| Flagler Post Office (historical) | Flagler Post Office (historical) | Marion | 748 | Knoxville |
| Fairmont Post Office (historical) | Fairmont Post Office (historical) | Marion | 928 | Knoxville |
| Red Cedar Mills Post Office (historical) | Red Cedar Mills Post Office (historical) | Marion | 771 | Lovilia |
| Everist Post Office (historical) | Everist Post Office (historical) | Marion | 787 | Lovilia |
| Marysville Post Office | Marysville Post Office | Marion | 722 | Lovilia |
| Dunreath Post Office (historical) | Dunreath Post Office (historical) | Marion | 771 | Knoxville NW |
| Donley Post Office (historical) | Donley Post Office (historical) | Marion | 758 | Knoxville SW |
| Red Rock Post Office (historical) | Red Rock Post Office (historical) | Marion | 748 | Otley |
| Cordova Post Office (historical) | Cordova Post Office (historical) | Marion | 748 | Otley |
| Gosport Post Office (historical) | Gosport Post Office (historical) | Marion | 942 | Melcher-Dallas |
| Cloud Post Office (historical) | Cloud Post Office (historical) | Marion | 935 | Melcher-Dallas |
| Caloma Post Office (historical) | Caloma Post Office (historical) | Marion | 955 | Beech |
| English Settlement Post Office (historical) | English Settlement Post Office (historical) | Marion | 705 | Harvey |
| Durham Post Office (historical) | Durham Post Office (historical) | Marion | 755 | Harvey |
| Bethel Post Office (historical) | Bethel Post Office (historical) | Marion | 722 | Harvey |
| Berry Post Office (historical) | Berry Post Office (historical) | Marion | 814 | Harvey |
| Newbern Post Office (historical) | Newbern Post Office (historical) | Marion | 997 | Newbern |
| Bauer Post Office (historical) | Bauer Post Office (historical) | Marion | 945 | Newbern |
| Elm Grove Post Office (historical) | Elm Grove Post Office (historical) | Marion | Unknown | |
| Cooper Springs Post Office (historical) | Cooper Springs Post Office (historical) | Marion | 804 | Attica |
| Attica Post Office (historical) | Attica Post Office (historical) | Marion | 919 | Attica |
| Poplar Grove Post Office (historical) | Poplar Grove Post Office (historical) | Marion | Unknown | |
| Mennon Post Office (historical) | Mennon Post Office (historical) | Marion | Unknown | |
| Divide Post Office (historical) | Divide Post Office (historical) | Marion | Unknown | |
| Pella Post Office | Pella Post Office | Marion | 886 | Pella |
| Melcher Post Office | Melcher Post Office | Marion | 951 | Melcher-Dallas |
| Dallas Post Office | Dallas Post Office | Marion | 948 | Melcher-Dallas |
| Pleasantville Post Office | Pleasantville Post Office | Marion | 922 | Pleasantville |
| Knoxville Post Office | Knoxville Post Office | Marion | 912 | Knoxville |
| Tracy Post Office | Tracy Post Office | Marion | 774 | Harvey |
| Swan Post Office | Swan Post Office | Marion | 778 | Pleasantville |
| Otley Post Office | Otley Post Office | Marion | 883 | Otley |
| Harvey Post Office | Harvey Post Office | Marion | 725 | Harvey |
| Columbia Post Office | Columbia Post Office | Marion | 948 | Melcher-Dallas |
| Hamilton Post Office | Hamilton Post Office | Marion | 899 | Lovilia |
| Bussey Post Office | Bussey Post Office | Marion | 856 | Lovilia |
| Del Norte Post Office (historical) | Del Norte Post Office (historical) | Davis | 883 | Bunker Hill |
| Uncle Abe Post Office (historical) | Uncle Abe Post Office (historical) | Davis | 863 | Paris |
| Taylor Post Office (historical) | Taylor Post Office (historical) | Davis | 761 | Pulaski |
| Stringtown Post Office (historical) | Stringtown Post Office (historical) | Davis | 728 | Milton |
| Mount Calvary Post Office (historical) | Mount Calvary Post Office (historical) | Davis | 945 | Paris |
| Lewiston Post Office (historical) | Lewiston Post Office (historical) | Davis | 866 | Bloomfield North |
| Mark Post Office (historical) | Mark Post Office (historical) | Davis | 919 | West Grove |
| Monterey Post Office (historical) | Monterey Post Office (historical) | Davis | 955 | West Grove |
| Waneta Post Office (historical) | Waneta Post Office (historical) | Davis | 823 | Pulaski |
| Salt Creek Post Office (historical) | Salt Creek Post Office (historical) | Davis | 656 | Floris |
| White Elm Post Office (historical) | White Elm Post Office (historical) | Davis | 810 | Selma |
| Rater Post Office (historical) | Rater Post Office (historical) | Davis | 689 | Ottumwa South |
| Carbon Hill Post Office (historical) | Carbon Hill Post Office (historical) | Davis | 699 | Ottumwa South |
| Chequest Post Office (historical) | Chequest Post Office (historical) | Davis | 807 | Selma |
| Carbon Post Office (historical) | Carbon Post Office (historical) | Davis | 696 | Ottumwa South |
| Browns Mills Post Office (historical) | Browns Mills Post Office (historical) | Davis | 696 | Ottumwa South |
| Laddsdale Post Office (historical) | Laddsdale Post Office (historical) | Davis | 636 | Agency |
| Harbour Post Office (historical) | Harbour Post Office (historical) | Davis | 866 | Bloomfield North |
| Chequist Post Office (historical) | Chequist Post Office (historical) | Davis | 850 | Bloomfield North |
| Belknap Post Office (historical) | Belknap Post Office (historical) | Davis | 863 | Bloomfield North |
| Blackhawk Post Office (historical) | Blackhawk Post Office (historical) | Davis | 784 | Paris |
| Fox Post Office (historical) | Fox Post Office (historical) | Davis | 866 | Paris |
| Nottingham Post Office (historical) | Nottingham Post Office (historical) | Davis | 876 | Paris |
| Oakspring Post Office (historical) | Oakspring Post Office (historical) | Davis | 768 | Paris |
| Albany Post Office (historical) | Albany Post Office (historical) | Davis | 932 | Blakesburg |
| Ash Grove Post Office (historical) | Ash Grove Post Office (historical) | Davis | 751 | Paris |
| Ajax Post Office (historical) | Ajax Post Office (historical) | Davis | 840 | Pulaski |
| Savannah Post Office (historical) | Savannah Post Office (historical) | Davis | 909 | Bunker Hill |
| Napesa Post Office (historical) | Napesa Post Office (historical) | Davis | Unknown | |
| Lost Rick Post Office (historical) | Lost Rick Post Office (historical) | Davis | Unknown | |
| Lunsford Post Office (historical) | Lunsford Post Office (historical) | Davis | 899 | Bunker Hill |
| Bloomfield Post Office | Bloomfield Post Office | Davis | 876 | Bloomfield North |
| West Grove Post Office (historical) | West Grove Post Office (historical) | Davis | 942 | West Grove |
| Troy Post Office (historical) | Troy Post Office (historical) | Davis | 804 | Milton |
| Pulaski Post Office | Pulaski Post Office | Davis | 833 | Pulaski |
| Floris Post Office | Floris Post Office | Davis | 692 | Floris |
| Drakesville Post Office | Drakesville Post Office | Davis | 886 | Bloomfield North |
| Edom Post Office (historical) | Edom Post Office (historical) | Keokuk | 823 | South English |
| Wimer's Mills Post Office (historical) | Wimer's Mills Post Office (historical) | Keokuk | 699 | Ollie |
| Warner's Mill Post Office (historical) | Warner's Mill Post Office (historical) | Keokuk | 686 | Harper |
| Talleyrand Post Office (historical) | Talleyrand Post Office (historical) | Keokuk | 771 | Keota |
| Slagle Post Office (historical) | Slagle Post Office (historical) | Keokuk | 778 | Delta |
| Showman Post Office (historical) | Showman Post Office (historical) | Keokuk | 673 | Hedrick |
| Lancaster Post Office (historical) | Lancaster Post Office (historical) | Keokuk | 771 | Sigourney |
| Kinross Post Office (historical) | Kinross Post Office (historical) | Keokuk | 823 | Kinross |
| Pecks Post Office (historical) | Pecks Post Office (historical) | Keokuk | 801 | What Cheer |
| Ioka Post Office (historical) | Ioka Post Office (historical) | Keokuk | 791 | Pekin |
| Nugent Post Office (historical) | Nugent Post Office (historical) | Keokuk | 781 | Pekin |
| Springfield Post Office (historical) | Springfield Post Office (historical) | Keokuk | 774 | Delta |
| Divide Post Office (historical) | Divide Post Office (historical) | Keokuk | 797 | Delta |
| Milan Post Office (historical) | Milan Post Office (historical) | Keokuk | 840 | What Cheer |
| Cory Post Office (historical) | Cory Post Office (historical) | Keokuk | 850 | What Cheer |
| Coal Creek Post Office | Coal Creek Post Office | Keokuk | 856 | Gibson |
| Baden Post Office (historical) | Baden Post Office (historical) | Keokuk | 787 | Harper |
| Atwood Post Office (historical) | Atwood Post Office (historical) | Keokuk | 699 | Rose Hill |
| Witter Post Office (historical) | Witter Post Office (historical) | Keokuk | Unknown | |
| Pleasant Grove Post Office (historical) | Pleasant Grove Post Office (historical) | Keokuk | Unknown | |
| Garibaldi Post Office (historical) | Garibaldi Post Office (historical) | Keokuk | Unknown | |
| Freedom Post Office (historical) | Freedom Post Office (historical) | Keokuk | Unknown | |
| What Cheer Post Office | What Cheer Post Office | Keokuk | 778 | What Cheer |
| Sigourney Post Office | Sigourney Post Office | Keokuk | 784 | Sigourney |
| Richland Post Office | Richland Post Office | Keokuk | 778 | Richland |
| Keota Post Office | Keota Post Office | Keokuk | 797 | Keota |
| Webster Post Office | Webster Post Office | Keokuk | 856 | Keswick |
| Thornburg Post Office | Thornburg Post Office | Keokuk | 876 | What Cheer |
| South English Post Office | South English Post Office | Keokuk | 846 | South English |
| Ollie Post Office | Ollie Post Office | Keokuk | 781 | Ollie |
| Martinsburg Post Office | Martinsburg Post Office | Keokuk | 804 | Hedrick |
| Keswick Post Office | Keswick Post Office | Keokuk | 873 | Keswick |
| Hedrick Post Office | Hedrick Post Office | Keokuk | 823 | Hedrick |
| Hayesville Post Office | Hayesville Post Office | Keokuk | 797 | Sigourney |
| Gibson Post Office | Gibson Post Office | Keokuk | 896 | Gibson |
| Delta Post Office | Delta Post Office | Keokuk | 804 | Delta |
| Harper Post Office | Harper Post Office | Keokuk | 810 | Harper |
| Woolson Post Office (historical) | Woolson Post Office (historical) | Jefferson | 748 | Richland |
| Pekin Post Office (historical) | Pekin Post Office (historical) | Jefferson | 814 | Pekin |
| East Pleasant Plain Post Office (historical) | East Pleasant Plain Post Office (historical) | Jefferson | 738 | Brighton |
| County Line Post Office (historical) | County Line Post Office (historical) | Jefferson | 784 | Eldon |
| Wooster Post Office (historical) | Wooster Post Office (historical) | Jefferson | 758 | Lockridge West |
| Lindby Post Office (historical) | Lindby Post Office (historical) | Jefferson | 814 | Pekin |
| Krum Post Office (historical) | Krum Post Office (historical) | Jefferson | 748 | Libertyville |
| Whitfield Post Office (historical) | Whitfield Post Office (historical) | Jefferson | 748 | Libertyville |
| Veo Post Office (historical) | Veo Post Office (historical) | Jefferson | 745 | Richland |
| Walnut Post Office (historical) | Walnut Post Office (historical) | Jefferson | 679 | Fairfield North |
| Salina Post Office (historical) | Salina Post Office (historical) | Jefferson | 755 | Salina |
| Harveys Mills Post Office (historical) | Harveys Mills Post Office (historical) | Jefferson | 643 | Salina |
| Harmony Post Office (historical) | Harmony Post Office (historical) | Jefferson | 764 | Fairfield South |
| Glasgow Post Office (historical) | Glasgow Post Office (historical) | Jefferson | 748 | Lockridge West |
| Pleasant Grove Post Office (historical) | Pleasant Grove Post Office (historical) | Jefferson | 761 | Fairfield North |
| Pleasant Plain Post Office (historical) | Pleasant Plain Post Office (historical) | Jefferson | 758 | Brighton |
| Cotton Grove Post Office (historical) | Cotton Grove Post Office (historical) | Jefferson | 784 | Eldon |
| Collett Post Office (historical) | Collett Post Office (historical) | Jefferson | 745 | Fairfield South |
| Brookville Post Office (historical) | Brookville Post Office (historical) | Jefferson | 781 | Brookville |
| Brays Post Office (historical) | Brays Post Office (historical) | Jefferson | 755 | Richland |
| Bernhart Post Office (historical) | Bernhart Post Office (historical) | Jefferson | 755 | Brookville |
| Belleville Post Office (historical) | Belleville Post Office (historical) | Jefferson | 814 | Ollie |
| Beckwith Post Office (historical) | Beckwith Post Office (historical) | Jefferson | 778 | Salina |
| Perlee Post Office (historical) | Perlee Post Office (historical) | Jefferson | 699 | Fairfield North |
| Absecom Post Office (historical) | Absecom Post Office (historical) | Jefferson | 771 | Eldon |
| Abingdon Post Office (historical) | Abingdon Post Office (historical) | Jefferson | 778 | Abingdon |
| Typee Post Office (historical) | Typee Post Office (historical) | Jefferson | Unknown | |
| Fairfield Post Office | Fairfield Post Office | Jefferson | 778 | Fairfield North |
| Packwood Post Office | Packwood Post Office | Jefferson | 810 | Ollie |
| Lockridge Post Office | Lockridge Post Office | Jefferson | 718 | Lockridge East |
| Libertyville Post Office | Libertyville Post Office | Jefferson | 764 | Libertyville |
| Batavia Post Office | Batavia Post Office | Jefferson | 751 | Eldon |
| Pierceville Post Office (historical) | Pierceville Post Office (historical) | Van Buren | 741 | Stockport |
| Upton Post Office (historical) | Upton Post Office (historical) | Van Buren | 748 | Cantril |
| Niles Post Office (historical) | Niles Post Office (historical) | Van Buren | 774 | Cantril |
| New Market Post Office (historical) | New Market Post Office (historical) | Van Buren | 607 | Selma |
| Pleasant Hill Post Office (historical) | Pleasant Hill Post Office (historical) | Van Buren | 627 | Keosauqua |
| Pittsburg Post Office (historical) | Pittsburg Post Office (historical) | Van Buren | 587 | Keosauqua |
| Winchester Post Office (historical) | Winchester Post Office (historical) | Van Buren | 751 | Mount Zion |
| Mount Zion Post Office (historical) | Mount Zion Post Office (historical) | Van Buren | 709 | Mount Zion |
| Mount Sterling Post Office (historical) | Mount Sterling Post Office (historical) | Van Buren | 676 | Mount Sterling |
| McVeigh Post Office (historical) | McVeigh Post Office (historical) | Van Buren | 751 | Stockport |
| Sheridan Post Office (historical) | Sheridan Post Office (historical) | Van Buren | 738 | Stockport |
| Wilsonville Post Office (historical) | Wilsonville Post Office (historical) | Van Buren | 741 | Stockport |
| Union Post Office (historical) | Union Post Office (historical) | Van Buren | 735 | Mount Zion |
| Longview Post Office (historical) | Longview Post Office (historical) | Van Buren | 755 | Stockport |
| Lick Creek Post Office (historical) | Lick Creek Post Office (historical) | Van Buren | 725 | Douds |
| Willits Post Office (historical) | Willits Post Office (historical) | Van Buren | 620 | Bonaparte |
| Lena Post Office (historical) | Lena Post Office (historical) | Van Buren | 620 | Bonaparte |
| Portland Post Office (historical) | Portland Post Office (historical) | Van Buren | 620 | Douds |
| Leando Post Office (historical) | Leando Post Office (historical) | Van Buren | 636 | Douds |
| Kilbourn Post Office (historical) | Kilbourn Post Office (historical) | Van Buren | 640 | Mount Zion |
| Iowaville Post Office (historical) | Iowaville Post Office (historical) | Van Buren | 610 | Eldon |
| Mechanicsburgh Post Office (historical) | Mechanicsburgh Post Office (historical) | Van Buren | 787 | Cantril |
| Lebanon Post Office (historical) | Lebanon Post Office (historical) | Van Buren | 784 | Cantril |
| Utica Post Office (historical) | Utica Post Office (historical) | Van Buren | 741 | Stockport |
| Harrisburg Post Office (historical) | Harrisburg Post Office (historical) | Van Buren | 741 | Stockport |
| Gainesborough Post Office (historical) | Gainesborough Post Office (historical) | Van Buren | 745 | Stockport |
| Boyer (historical) | Boyer (historical) | Van Buren | 604 | Bonaparte |
| Pameko Post Office (historical) | Pameko Post Office (historical) | Van Buren | Unknown | |
| Vernon Post Office (historical) | Vernon Post Office (historical) | Van Buren | 581 | Bonaparte |
| Bentonsport Post Office (historical) | Bentonsport Post Office (historical) | Van Buren | 561 | Bonaparte |
| Selma Post Office | Selma Post Office | Van Buren | 614 | Selma |
| Milton Post Office | Milton Post Office | Van Buren | 801 | Milton |
| Keosauqua Post Office | Keosauqua Post Office | Van Buren | 591 | Keosauqua |
| Farmington Post Office | Farmington Post Office | Van Buren | 551 | Farmington |
| Cantril Post Office | Cantril Post Office | Van Buren | 778 | Cantril |
| Bonaparte Post Office | Bonaparte Post Office | Van Buren | 554 | Bonaparte |
| Birmingham Post Office | Birmingham Post Office | Van Buren | 755 | Fairfield South |
| Douds Post Office | Douds Post Office | Van Buren | 600 | Douds |
| Stockport Post Office | Stockport Post Office | Van Buren | 755 | Stockport |
| Mount Hamill Post Office (historical) | Mount Hamill Post Office (historical) | Lee | 718 | Salem |
| White Lane Post Office (historical) | White Lane Post Office (historical) | Lee | 709 | Salem |
| Galland Post Office (historical) | Galland Post Office (historical) | Lee | 535 | Niota |
| Nashville Post Office (historical) | Nashville Post Office (historical) | Lee | 538 | Niota |
| Bricker Post Office (historical) | Bricker Post Office (historical) | Lee | 568 | Nauvoo |
| Mount Clara Post Office (historical) | Mount Clara Post Office (historical) | Lee | 643 | Nauvoo |
| Viele Post Office (historical) | Viele Post Office (historical) | Lee | 541 | Nauvoo |
| Ambrosia Post Office (historical) | Ambrosia Post Office (historical) | Lee | 682 | Nauvoo |
| Pleasant Ridge Post Office (historical) | Pleasant Ridge Post Office (historical) | Lee | 646 | Lowell |
| Mooar Post Office (historical) | Mooar Post Office (historical) | Lee | 669 | Keokuk |
| Sandusky Post Office (historical) | Sandusky Post Office (historical) | Lee | 541 | Keokuk |
| Summitville Post Office (historical) | Summitville Post Office (historical) | Lee | 676 | Keokuk |
| Cottonwood Post Office (historical) | Cottonwood Post Office (historical) | Lee | 712 | Hillsboro |
| Big Mound Post Office (historical) | Big Mound Post Office (historical) | Lee | 738 | Hillsboro |
| Sawyer Post Office (historical) | Sawyer Post Office (historical) | Lee | 712 | Fort Madison |
| Primrose Post Office (historical) | Primrose Post Office (historical) | Lee | 712 | Farmington |
| Warren Post Office (historical) | Warren Post Office (historical) | Lee | 705 | Donnellson |
| La Crew Post Office (historical) | La Crew Post Office (historical) | Lee | 715 | Donnellson |
| Clay's Grove Post Office (historical) | Clay's Grove Post Office (historical) | Lee | 699 | Donnellson |
| Franklin Station Post Office (historical) | Franklin Station Post Office (historical) | Lee | 696 | Donnellson |
| Franklin Post Office (historical) | Franklin Post Office (historical) | Lee | 696 | Donnellson |
| Dover Post Office (historical) | Dover Post Office (historical) | Lee | 682 | Donnellson |
| Croton Post Office (historical) | Croton Post Office (historical) | Lee | 548 | Croton |
| Charleston Post Office (historical) | Charleston Post Office (historical) | Lee | 699 | Argyle |
| New Boston Post Office (historical) | New Boston Post Office (historical) | Lee | 696 | Argyle |
| String Prairie Post Office (historical) | String Prairie Post Office (historical) | Lee | 669 | Argyle |
| Belfast Post Office (historical) | Belfast Post Office (historical) | Lee | 610 | Argyle |
| Hinsdale Post Office (historical) | Hinsdale Post Office (historical) | Lee | 564 | Argyle |
| Monterey Post Office (historical) | Monterey Post Office (historical) | Lee | Unknown | |
| Larson Post Office (historical) | Larson Post Office (historical) | Lee | Unknown | |
| Fort Madison Post Office | Fort Madison Post Office | Lee | 535 | Fort Madison |
| Keokuk Post Office | Keokuk Post Office | Lee | 561 | Keokuk |
| Montrose Post Office | Montrose Post Office | Lee | 535 | Nauvoo |
| West Point Post Office | West Point Post Office | Lee | 764 | West Point |
| Denmark Post Office | Denmark Post Office | Lee | 725 | Fort Madison |
| Wever Post Office | Wever Post Office | Lee | 564 | Dallas City |
| Saint Paul Post Office | Saint Paul Post Office | Lee | 718 | Salem |
| Pilot Grove Post Office | Pilot Grove Post Office | Lee | 650 | Salem |
| Houghton Post Office | Houghton Post Office | Lee | 715 | Salem |
| Argyle Post Office | Argyle Post Office | Lee | 679 | Argyle |
| Vincennes Post Office (historical) | Vincennes Post Office (historical) | Lee | 554 | Wayland |
| Parsonville Post Office (historical) | Parsonville Post Office (historical) | Jefferson | 778 | Salina |
| Lahoyt Post Office (historical) | Lahoyt Post Office (historical) | Henry | 715 | Mount Pleasant |
| Finis Post Office (historical) | Finis Post Office (historical) | Henry | 712 | Lockridge East |
| Vega Post Office (historical) | Vega Post Office (historical) | Henry | 646 | Lockridge East |
| Traxler Post Office (historical) | Traxler Post Office (historical) | Henry | 659 | Swedesburg |
| Coppock Post Office (historical) | Coppock Post Office (historical) | Henry | 633 | Wayland |
| Trenton Post Office (historical) | Trenton Post Office (historical) | Henry | 728 | Trenton |
| Rural Post Office (historical) | Rural Post Office (historical) | Henry | 679 | Mount Pleasant |
| East Grove Post Office (historical) | East Grove Post Office (historical) | Henry | 686 | Salem |
| Arthur Post Office (historical) | Arthur Post Office (historical) | Henry | 636 | Salem |
| Oakland Mills Post Office (historical) | Oakland Mills Post Office (historical) | Henry | 568 | Mount Pleasant |
| Beery Post Office (historical) | Beery Post Office (historical) | Henry | 584 | Lowell |
| Lowell Post Office (historical) | Lowell Post Office (historical) | Henry | 584 | Lowell |
| Denova Post Office (historical) | Denova Post Office (historical) | Henry | 718 | Lockridge East |
| Rome Post Office (historical) | Rome Post Office (historical) | Henry | 597 | Lockridge East |
| Salem Post Office | Salem Post Office | Henry | 718 | Salem |
| Mount Pleasant Post Office | Mount Pleasant Post Office | Henry | 735 | Mount Pleasant |
| Wayland Post Office | Wayland Post Office | Henry | 738 | Wayland |
| New London Post Office | New London Post Office | Henry | 761 | New London |
| Olds Post Office | Olds Post Office | Henry | 732 | Crawfordsville |
| Mount Union Post Office | Mount Union Post Office | Henry | 725 | Winfield South |
| Hillsboro Post Office | Hillsboro Post Office | Henry | 732 | Hillsboro |
| Wellston Post Office (historical) | Wellston Post Office (historical) | Washington | 751 | West Chester |
| Titus Post Office (historical) | Titus Post Office (historical) | Washington | 768 | West Chester |
| New Haven Post Office (historical) | New Haven Post Office (historical) | Washington | 768 | West Chester |
| Gracehill Post Office (historical) | Gracehill Post Office (historical) | Washington | 751 | West Chester |
| Daytonville Post Office (historical) | Daytonville Post Office (historical) | Washington | 791 | Wellman |
| Lexington Post Office (historical) | Lexington Post Office (historical) | Washington | 791 | Wellman |
| Pilotburg Post Office (historical) | Pilotburg Post Office (historical) | Washington | 797 | Wellman |
| Rubio Post Office (historical) | Rubio Post Office (historical) | Washington | 640 | Richland |
| White Ash Post Office (historical) | White Ash Post Office (historical) | Washington | 689 | Lone Tree |
| Seventy Six Centre Post Office (historical) | Seventy Six Centre Post Office (historical) | Washington | 794 | Kinross |
| Nira Post Office (historical) | Nira Post Office (historical) | Washington | 781 | Kinross |
| Richmond Post Office (historical) | Richmond Post Office (historical) | Washington | 755 | Kalona |
| Noble Post Office (historical) | Noble Post Office (historical) | Washington | 689 | Crawfordsville |
| Davis Creek Post Office (historical) | Davis Creek Post Office (historical) | Washington | 682 | Riverside |
| Yatton Post Office (historical) | Yatton Post Office (historical) | Washington | 636 | Riverside |
| Lake Post Office (historical) | Lake Post Office (historical) | Washington | 712 | Wayland |
| Marcellus Post Office (historical) | Marcellus Post Office (historical) | Washington | 735 | Wayland |
| Verdi Post Office (historical) | Verdi Post Office (historical) | Washington | 673 | Brighton |
| Haskins Post Office (historical) | Haskins Post Office (historical) | Washington | 758 | Ainsworth |
| Havre Post Office (historical) | Havre Post Office (historical) | Washington | 748 | Ainsworth |
| Pottsville Post Office (historical) | Pottsville Post Office (historical) | Washington | 738 | Ainsworth |
| Center Hill Post Office (historical) | Center Hill Post Office (historical) | Washington | 738 | Ainsworth |
| Riverside Post Office | Riverside Post Office | Washington | 653 | Riverside |
| Washington Post Office | Washington Post Office | Washington | 758 | Washington |
| Kalona Post Office | Kalona Post Office | Washington | 659 | Kalona |
| Wellman Post Office | Wellman Post Office | Washington | 712 | Wellman |
| Crawfordsville Post Office | Crawfordsville Post Office | Washington | 735 | Crawfordsville |
| Brighton Post Office | Brighton Post Office | Washington | 755 | Brighton |
| Ainsworth Post Office | Ainsworth Post Office | Washington | 709 | Ainsworth |
| West Chester Post Office | West Chester Post Office | Washington | 774 | West Chester |
| Whiting Post Office | Whiting Post Office | Monona | 1063 | Sloan |
| Ute Post Office | Ute Post Office | Monona | 1243 | Ute |
| Mapleton Post Office | Mapleton Post Office | Monona | 1145 | Mapleton |
| Castana Post Office | Castana Post Office | Monona | 1145 | Castana |
| Onawa Post Office | Onawa Post Office | Monona | 1053 | Onawa |
| Tieville Post Office (historical) | Tieville Post Office (historical) | Monona | 1063 | Onawa SW |
| Maple Landing Post Office (historical) | Maple Landing Post Office (historical) | Monona | 1063 | Onawa SW |
| Kennebec Post Office (historical) | Kennebec Post Office (historical) | Monona | 1053 | Onawa |
| Hall Creek Post Office (historical) | Hall Creek Post Office (historical) | Monona | 1096 | Moorhead NW |
| Preparation Post Office (historical) | Preparation Post Office (historical) | Monona | 1093 | Moorhead NW |
| Hiawatha Post Office (historical) | Hiawatha Post Office (historical) | Monona | 1381 | Moorhead NW |
| Lossing Post Office (historical) | Lossing Post Office (historical) | Monona | 1070 | Sloan |
| Albaton Post Office (historical) | Albaton Post Office (historical) | Monona | 1070 | Albaton |
| King's Ranch Post Office (historical) | King's Ranch Post Office (historical) | Monona | Unknown | |
| Boyer City Post Office (historical) | Boyer City Post Office (historical) | Monona | Unknown | |
| Bottom Post Office (historical) | Bottom Post Office (historical) | Monona | Unknown | |
| Turin Post Office | Turin Post Office | Monona | 1050 | Castana |
| Rodney Post Office | Rodney Post Office | Monona | 1115 | Smithland |
| Blencoe Post Office | Blencoe Post Office | Monona | 1040 | Blencoe |
| Bigler's Grove Post Office (historical) | Bigler's Grove Post Office (historical) | Harrison | 1332 | Missouri Valley NW |
| Rode Post Office (historical) | Rode Post Office (historical) | Harrison | 1010 | Beebeetown |
| Twelve Mile Grove Post Office (historical) | Twelve Mile Grove Post Office (historical) | Harrison | 1168 | Woodbine |
| Whitesboro Post Office (historical) | Whitesboro Post Office (historical) | Harrison | 1070 | Woodbine |
| Ojedo Post Office (historical) | Ojedo Post Office (historical) | Harrison | 1276 | Woodbine |
| Jeddo City Post Office (historical) | Jeddo City Post Office (historical) | Harrison | 1138 | Woodbine |
| Needmore Post Office (historical) | Needmore Post Office (historical) | Harrison | 1204 | Woodbine |
| Soldier Valley Post Office (historical) | Soldier Valley Post Office (historical) | Harrison | 1053 | Pisgah |
| Orson Post Office (historical) | Orson Post Office (historical) | Harrison | 1053 | Pisgah |
| Yorkshire Post Office (historical) | Yorkshire Post Office (historical) | Harrison | 1175 | Persia |
| Gamet Post Office (historical) | Gamet Post Office (historical) | Harrison | 1286 | Moorhead SE |
| California Post Office (historical) | California Post Office (historical) | Harrison | 1007 | Missouri Valley |
| Calhoun Post Office (historical) | Calhoun Post Office (historical) | Harrison | 1024 | Missouri Valley NW |
| Echo Post Office (historical) | Echo Post Office (historical) | Harrison | 1158 | Missouri Valley NW |
| Magnolia Post Office (historical) | Magnolia Post Office (historical) | Harrison | 1339 | Missouri Valley NW |
| Raglan Post Office (historical) | Raglan Post Office (historical) | Harrison | 1273 | Missouri Valley NW |
| Melrose Post Office (historical) | Melrose Post Office (historical) | Harrison | 1033 | Missouri Valley NW |
| Saint John Post Office (historical) | Saint John Post Office (historical) | Harrison | 1030 | Missouri Valley |
| River Sioux Post Office (historical) | River Sioux Post Office (historical) | Harrison | 1040 | Little Sioux |
| Harris Grove Post Office (historical) | Harris Grove Post Office (historical) | Harrison | 1342 | Hard Scratch |
| Mount Norris Post Office (historical) | Mount Norris Post Office (historical) | Harrison | 1197 | Hard Scratch |
| Crisp Post Office (historical) | Crisp Post Office (historical) | Harrison | 1247 | Hard Scratch |
| Reeder Mills Post Office (historical) | Reeder Mills Post Office (historical) | Harrison | 1220 | Hard Scratch |
| Unionburgh Post Office (historical) | Unionburgh Post Office (historical) | Harrison | 1247 | Hard Scratch |
| Valley View Post Office (historical) | Valley View Post Office (historical) | Harrison | 1184 | Hard Scratch |
| Deputy Post Office (historical) | Deputy Post Office (historical) | Harrison | 1378 | Dunlap SW |
| Harrison Post Office (historical) | Harrison Post Office (historical) | Harrison | 1086 | Dunlap |
| Beebeetown Post Office (historical) | Beebeetown Post Office (historical) | Harrison | 1325 | Beebeetown |
| Olympus Post Office (historical) | Olympus Post Office (historical) | Harrison | 1401 | Moorhead SE |
| Allen Post Office (historical) | Allen Post Office (historical) | Harrison | 1394 | Moorhead SE |
| Martin's Ranch Post Office (historical) | Martin's Ranch Post Office (historical) | Harrison | Unknown | |
| Nephi Post Office (historical) | Nephi Post Office (historical) | Harrison | Unknown | |
| Silver Prairie Post Office (historical) | Silver Prairie Post Office (historical) | Harrison | Unknown | |
| Woodbine Post Office | Woodbine Post Office | Harrison | 1086 | Woodbine |
| Pisgah Post Office | Pisgah Post Office | Harrison | 1060 | Pisgah |
| Persia Post Office | Persia Post Office | Harrison | 1181 | Persia |
| Mondamin Post Office | Mondamin Post Office | Harrison | 1024 | Mondamin |
| Modale Post Office | Modale Post Office | Harrison | 1014 | Modale |
| Missouri Valley Post Office | Missouri Valley Post Office | Harrison | 1014 | Missouri Valley |
| Logan Post Office | Logan Post Office | Harrison | 1099 | Logan |
| Little Sioux Post Office (historical) | Little Sioux Post Office (historical) | Harrison | 1037 | Little Sioux |
| Dunlap Post Office | Dunlap Post Office | Harrison | 1142 | Dunlap |
| Winfield Post Office | Winfield Post Office | Henry | 705 | Winfield North |
| Bethel Post Office (historical) | Bethel Post Office (historical) | Washington | 620 | Cotter |
| Spring Run Post Office (historical) | Spring Run Post Office (historical) | Louisa | 705 | Cairo |
| Wyman Post Office (historical) | Wyman Post Office (historical) | Louisa | 728 | Winfield North |
| Port Louisa Post Office (historical) | Port Louisa Post Office (historical) | Louisa | 551 | Wapello |
| Harrison Post Office (historical) | Harrison Post Office (historical) | Louisa | 561 | Wapello |
| Toosesboro Post Office (historical) | Toosesboro Post Office (historical) | Louisa | 682 | Toolesboro |
| Florence Post Office (historical) | Florence Post Office (historical) | Louisa | 558 | Oakville |
| Palo Alto Post Office (historical) | Palo Alto Post Office (historical) | Louisa | 538 | Oakville |
| Elrick Post Office (historical) | Elrick Post Office (historical) | Louisa | 558 | Oakville |
| Mid Prairie Post Office (historical) | Mid Prairie Post Office (historical) | Louisa | 725 | Morning Sun |
| Marsh Post Office (historical) | Marsh Post Office (historical) | Louisa | 738 | Morning Sun |
| Newport Post Office (historical) | Newport Post Office (historical) | Louisa | 722 | Mediapolis |
| Big Springs Post Office (historical) | Big Springs Post Office (historical) | Louisa | 646 | Lone Tree |
| Louisa Centre Post Office (historical) | Louisa Centre Post Office (historical) | Louisa | 689 | Cairo |
| Cotter Post Office (historical) | Cotter Post Office (historical) | Louisa | 709 | Cotter |
| Gladwin Post Office (historical) | Gladwin Post Office (historical) | Louisa | 617 | Cotter |
| Fredonia Post Office (historical) | Fredonia Post Office (historical) | Louisa | 594 | Columbus Junction |
| Altona Post Office (historical) | Altona Post Office (historical) | Louisa | 577 | Columbus Junction |
| Cairo Post Office (historical) | Cairo Post Office (historical) | Louisa | 722 | Cairo |
| Bard Post Office (historical) | Bard Post Office (historical) | Louisa | 604 | Cairo |
| Virginia Grove Post Office (historical) | Virginia Grove Post Office (historical) | Louisa | 771 | Cairo |
| Joy Post Office (historical) | Joy Post Office (historical) | Louisa | Unknown | |
| Forest Hill Post Office (historical) | Forest Hill Post Office (historical) | Louisa | Unknown | |
| Wapello Post Office | Wapello Post Office | Louisa | 581 | Wapello |
| Morning Sun Post Office | Morning Sun Post Office | Louisa | 755 | Morning Sun |
| Columbus Junction Post Office | Columbus Junction Post Office | Louisa | 607 | Columbus Junction |
| Letts Post Office | Letts Post Office | Louisa | 679 | Letts |
| Oakville Post Office | Oakville Post Office | Louisa | 541 | Oakville |
| Columbus City Post Office | Columbus City Post Office | Louisa | 728 | Columbus Junction |
| Grandview Post Office | Grandview Post Office | Louisa | 715 | Letts |
| Mallory Post Office (historical) | Mallory Post Office (historical) | Shelby | 1280 | Defiance |
| Shelbyville Post Office (historical) | Shelbyville Post Office (historical) | Shelby | 1394 | Earling |
| Somida Post Office (historical) | Somida Post Office (historical) | Shelby | 1253 | Harlan |
| Prairie Rose Post Office (historical) | Prairie Rose Post Office (historical) | Shelby | 1335 | Prairie Rose Lake |
| Rorbeck Post Office (historical) | Rorbeck Post Office (historical) | Shelby | 1283 | Prairie Rose Lake |
| Sampson Post Office (historical) | Sampson Post Office (historical) | Shelby | 1175 | Persia |
| Roach Post Office (historical) | Roach Post Office (historical) | Shelby | 1207 | Panama |
| Jacksonville Post Office (historical) | Jacksonville Post Office (historical) | Shelby | 1276 | Jacksonville |
| Botany Post Office (historical) | Botany Post Office (historical) | Shelby | 1224 | Jacksonville |
| Redline Post Office (historical) | Redline Post Office (historical) | Shelby | 1266 | Jacksonville |
| Botna Post Office (historical) | Botna Post Office (historical) | Shelby | 1309 | Irwin |
| Pomo Post Office (historical) | Pomo Post Office (historical) | Shelby | 1299 | Earling |
| Corley Post Office (historical) | Corley Post Office (historical) | Shelby | 1184 | Corley |
| Altamont Post Office (historical) | Altamont Post Office (historical) | Shelby | 1191 | Corley |
| Coon Post Office (historical) | Coon Post Office (historical) | Shelby | Unknown | |
| Harlan Post Office | Harlan Post Office | Shelby | 1263 | Harlan |
| Shelby Post Office | Shelby Post Office | Shelby | 1319 | Shelby |
| Tennant Post Office (historical) | Tennant Post Office (historical) | Shelby | 1381 | Shelby |
| Westphalia Post Office | Westphalia Post Office | Shelby | 1427 | Panama |
| Portsmouth Post Office | Portsmouth Post Office | Shelby | 1220 | Portsmouth |
| Panama Post Office | Panama Post Office | Shelby | 1263 | Panama |
| Kirkman Post Office | Kirkman Post Office | Shelby | 1250 | Harlan |
| Irwin Post Office | Irwin Post Office | Shelby | 1283 | Irwin |
| Elk Horn Post Office | Elk Horn Post Office | Shelby | 1362 | Elk Horn |
| Earling Post Office | Earling Post Office | Shelby | 1342 | Earling |
| Defiance Post Office | Defiance Post Office | Shelby | 1273 | Defiance |
| Westside Post Office | Westside Post Office | Crawford | 1335 | Arcadia |
| Vail Post Office | Vail Post Office | Crawford | 1257 | Vail |
| Schleswig Post Office | Schleswig Post Office | Crawford | 1509 | Schleswig |
| Manilla Post Office | Manilla Post Office | Crawford | 1342 | Manilla |
| Dow City Post Office | Dow City Post Office | Crawford | 1138 | Dow City |
| Charter Oak Post Office | Charter Oak Post Office | Crawford | 1253 | Charter Oak |
| Coon Grove Post Office (historical) | Coon Grove Post Office (historical) | Crawford | 1371 | Earling NE |
| Johnsonville Post Office (historical) | Johnsonville Post Office (historical) | Crawford | 1404 | Kiron |
| Como Post Office (historical) | Como Post Office (historical) | Crawford | 1289 | Charter Oak |
| Morgan Post Office (historical) | Morgan Post Office (historical) | Crawford | 1444 | Schleswig |
| Paradise Post Office (historical) | Paradise Post Office (historical) | Crawford | 1253 | Dunlap NE |
| Bell Post Office (historical) | Bell Post Office (historical) | Crawford | 1155 | Dow City |
| Astor Post Office (historical) | Astor Post Office (historical) | Crawford | 1299 | Defiance |
| Kenwood Post Office (historical) | Kenwood Post Office (historical) | Crawford | 1250 | Charter Oak |
| Boyer Post Office (historical) | Boyer Post Office (historical) | Crawford | 1243 | Boyer |
| Ells Post Office (historical) | Ells Post Office (historical) | Crawford | 1224 | Boyer |
| Adrian Post Office (historical) | Adrian Post Office (historical) | Crawford | 1309 | Danbury |
| Adena Post Office (historical) | Adena Post Office (historical) | Crawford | 1447 | Arcadia |
| Denison Post Office | Denison Post Office | Crawford | 1289 | Denison |
| Ricketts Post Office | Ricketts Post Office | Crawford | 1322 | Ricketts |
| Kiron Post Office | Kiron Post Office | Crawford | 1339 | Kiron |
| Deloit Post Office | Deloit Post Office | Crawford | 1194 | Denison |
| Aspinwall Post Office (historical) | Aspinwall Post Office (historical) | Crawford | 1404 | Manilla |
| Buck Grove Post Office (historical) | Buck Grove Post Office (historical) | Crawford | 1283 | Dow City |
| Arion Post Office (historical) | Arion Post Office (historical) | Crawford | 1145 | Dow City |
| Philo Post Office (historical) | Philo Post Office (historical) | Sac | 1335 | Odebolt East |
| Mount Hope Post Office (historical) | Mount Hope Post Office (historical) | Sac | 1424 | Schaller North |
| Schoharie Post Office (historical) | Schoharie Post Office (historical) | Sac | 1273 | Sac City East |
| Mercer Post Office (historical) | Mercer Post Office (historical) | Sac | 1253 | Lake View |
| Wheelers Ranch Post Office (historical) | Wheelers Ranch Post Office (historical) | Sac | 1388 | Odebolt East |
| Oliver Post Office (historical) | Oliver Post Office (historical) | Sac | 1293 | Odebolt East |
| Leota Post Office (historical) | Leota Post Office (historical) | Sac | 1316 | Newell West |
| Herring Post Office (historical) | Herring Post Office (historical) | Sac | 1293 | Boyer |
| Elk Run Post Office (historical) | Elk Run Post Office (historical) | Sac | 1401 | Schaller South |
| Pettis Post Office (historical) | Pettis Post Office (historical) | Sac | 1220 | Grant City |
| Grant City Post Office (historical) | Grant City Post Office (historical) | Sac | 1161 | Grant City |
| Ulmer Post Office (historical) | Ulmer Post Office (historical) | Sac | 1276 | Grant City |
| Coon Valley Post Office (historical) | Coon Valley Post Office (historical) | Sac | 1207 | Grant City |
| Cedar Forks Post Office (historical) | Cedar Forks Post Office (historical) | Sac | 1355 | Early |
| Sac City Post Office | Sac City Post Office | Sac | 1217 | Sac City East |
| Wall Lake Post Office | Wall Lake Post Office | Sac | 1247 | Lake View |
| Schaller Post Office | Schaller Post Office | Sac | 1404 | Schaller South |
| Odebolt Post Office | Odebolt Post Office | Sac | 1362 | Odebolt West |
| Lake View Post Office | Lake View Post Office | Sac | 1253 | Lake View |
| Lytton Post Office | Lytton Post Office | Sac | 1227 | Lytton |
| Early Post Office | Early Post Office | Sac | 1339 | Early |
| Auburn Post Office | Auburn Post Office | Sac | 1227 | Grant City |
| Nemaha Post Office | Nemaha Post Office | Sac | 1322 | Newell West |
| Carnarvon Post Office | Carnarvon Post Office | Sac | 1260 | Lake View |
| Holstein Post Office | Holstein Post Office | Ida | 1453 | Holstein |
| Ida Grove Post Office | Ida Grove Post Office | Ida | 1250 | Ida Grove |
| Galva Post Office | Galva Post Office | Ida | 1296 | Galva |
| Battle Creek Post Office | Battle Creek Post Office | Ida | 1197 | Battle Creek |
| Arthur Post Office | Arthur Post Office | Ida | 1299 | Odebolt West |
| Dreessen Post Office (historical) | Dreessen Post Office (historical) | Ida | 1489 | Schleswig |
| Cornelia Post Office (historical) | Cornelia Post Office (historical) | Ida | 1404 | Holstein |
| Fifteen Mile Post Office (historical) | Fifteen Mile Post Office (historical) | Tama | 1053 | Grundy Center |
| Bruner Post Office (historical) | Bruner Post Office (historical) | Tama | 948 | Gladbrook SE |
| Irving Post Office (historical) | Irving Post Office (historical) | Tama | 833 | Belle Plaine |
| Kinisaw Post Office (historical) | Kinisaw Post Office (historical) | Tama | 781 | Chelsea |
| Tamaville Post Office (historical) | Tamaville Post Office (historical) | Tama | 873 | Chelsea |
| Oakwood Post Office (historical) | Oakwood Post Office (historical) | Tama | 1047 | Gladbrook |
| Howard Post Office (historical) | Howard Post Office (historical) | Tama | 1014 | Gladbrook SE |
| Heath Post Office (historical) | Heath Post Office (historical) | Tama | 925 | Garwin |
| Kars Post Office (historical) | Kars Post Office (historical) | Tama | 1027 | Garwin |
| Midland Post Office (historical) | Midland Post Office (historical) | Tama | 997 | Buckingham |
| Geneseo Post Office (historical) | Geneseo Post Office (historical) | Tama | 981 | Traer |
| Ramona Post Office (historical) | Ramona Post Office (historical) | Tama | 955 | Tama |
| Ola Post Office (historical) | Ola Post Office (historical) | Tama | 807 | Tama |
| Dinsdale Post Office (historical) | Dinsdale Post Office (historical) | Tama | 948 | Reinbeck |
| Connell Post Office (historical) | Connell Post Office (historical) | Tama | 1017 | Reinbeck |
| Potter Post Office (historical) | Potter Post Office (historical) | Tama | 860 | Montour |
| Coldville Post Office (historical) | Coldville Post Office (historical) | Tama | 1066 | Lincoln |
| Fairhaven Post Office (historical) | Fairhaven Post Office (historical) | Tama | 1030 | Gladbrook |
| Collins Grove Post Office | Collins Grove Post Office | Tama | 938 | Gladbrook NE |
| Butlerville Post Office (historical) | Butlerville Post Office (historical) | Tama | 873 | Garwin |
| Waltham Post Office (historical) | Waltham Post Office (historical) | Tama | 837 | Elberon |
| Mooreville Post Office (historical) | Mooreville Post Office (historical) | Tama | 853 | Dysart |
| Long Point Post Office (historical) | Long Point Post Office (historical) | Tama | 804 | Chelsea |
| Eureka Post Office (historical) | Eureka Post Office (historical) | Tama | 873 | Chelsea |
| Haven Post Office (historical) | Haven Post Office (historical) | Tama | 873 | Chelsea |
| Gladstone Post Office (historical) | Gladstone Post Office (historical) | Tama | 860 | Chelsea |
| Vining Post Office | Vining Post Office | Tama | 899 | Chelsea |
| Bovina Post Office (historical) | Bovina Post Office (historical) | Tama | 915 | Buckingham |
| Redman Post Office (historical) | Redman Post Office (historical) | Tama | 850 | Belle Plaine |
| Salt Creek Post Office (historical) | Salt Creek Post Office (historical) | Tama | Unknown | |
| Fox Point Post Office (historical) | Fox Point Post Office (historical) | Tama | Unknown | |
| Forks Post Office (historical) | Forks Post Office (historical) | Tama | Unknown | |
| Traer Post Office | Traer Post Office | Tama | 902 | Traer |
| Toledo Post Office | Toledo Post Office | Tama | 856 | Tama |
| Tama Post Office | Tama Post Office | Tama | 823 | Tama |
| Montour Post Office | Montour Post Office | Tama | 850 | Montour |
| Lincoln Post Office | Lincoln Post Office | Tama | 1063 | Lincoln |
| Gladbrook Post Office | Gladbrook Post Office | Tama | 978 | Gladbrook |
| Garwin Post Office | Garwin Post Office | Tama | 906 | Garwin |
| Elberon Post Office | Elberon Post Office | Tama | 886 | Elberon |
| Dysart Post Office | Dysart Post Office | Tama | 968 | Dysart |
| Clutier Post Office | Clutier Post Office | Tama | 869 | Clutier |
| Chelsea Post Office | Chelsea Post Office | Tama | 784 | Chelsea |
| Buckingham Post Office | Buckingham Post Office | Tama | 899 | Buckingham |
| Crystal Post Office (historical) | Crystal Post Office (historical) | Tama | 942 | Gladbrook NE |
| Greenwood Hill Post Office (historical) | Greenwood Hill Post Office (historical) | Grundy | 994 | Conrad East |
| Bois D'Arc Post Office (historical) | Bois D'Arc Post Office (historical) | Grundy | 971 | Zaneta |
| Kingsbury Post Office (historical) | Kingsbury Post Office (historical) | Grundy | 968 | Zaneta |
| Zaneta Post Office (historical) | Zaneta Post Office (historical) | Grundy | 909 | Zaneta |
| Fredsville Post Office (historical) | Fredsville Post Office (historical) | Grundy | 1014 | Zaneta |
| Lear Post Office (historical) | Lear Post Office (historical) | Grundy | 1056 | Stout |
| Taylor Hill Post Office (historical) | Taylor Hill Post Office (historical) | Grundy | 997 | Stout |
| Melrose Post Office (historical) | Melrose Post Office (historical) | Grundy | 1109 | Ivester |
| Fern Post Office (historical) | Fern Post Office (historical) | Grundy | 1060 | Holland |
| Dairyville Post Office (historical) | Dairyville Post Office (historical) | Grundy | 974 | Dike |
| Arrow Post Office (historical) | Arrow Post Office (historical) | Grundy | 984 | Dike |
| Lincoln Post Office (historical) | Lincoln Post Office (historical) | Grundy | 1056 | Holland |
| Dike Post Office | Dike Post Office | Grundy | 942 | Dike |
| Grundy Center Post Office | Grundy Center Post Office | Grundy | 1020 | Grundy Center |
| Wellsburg Post Office | Wellsburg Post Office | Grundy | 1099 | Wellsburg |
| Stout Post Office | Stout Post Office | Grundy | 1024 | Stout |
| Reinbeck Post Office | Reinbeck Post Office | Grundy | 958 | Reinbeck |
| Morrison Post Office | Morrison Post Office | Grundy | 951 | Lincoln |
| Ivester Post Office (historical) | Ivester Post Office (historical) | Grundy | 1119 | Ivester |
| Holland Post Office | Holland Post Office | Grundy | 1001 | Holland |
| Conrad Post Office | Conrad Post Office | Grundy | 1007 | Conrad East |
| Beaman Post Office | Beaman Post Office | Grundy | 981 | Conrad East |
| Jasper Post Office (historical) | Jasper Post Office (historical) | Carroll | 1083 | Lanesboro |
| Benan Post Office (historical) | Benan Post Office (historical) | Carroll | 1063 | Glidden |
| Willey Post Office (historical) | Willey Post Office (historical) | Carroll | 1348 | Dedham |
| Carrollton Post Office (historical) | Carrollton Post Office (historical) | Carroll | 1217 | Coon Rapids North |
| Maple River Post Office (historical) | Maple River Post Office (historical) | Carroll | 1293 | Carroll West |
| Roselle Post Office (historical) | Roselle Post Office (historical) | Carroll | 1375 | Carroll West |
| Kentner Post Office (historical) | Kentner Post Office (historical) | Carroll | 1243 | Carroll NE |
| Mount Carmel Post Office (historical) | Mount Carmel Post Office (historical) | Carroll | 1355 | Breda |
| Macks Post Office (historical) | Macks Post Office (historical) | Carroll | 1214 | Carroll East |
| Manning Post Office | Manning Post Office | Carroll | 1355 | Manning |
| Glidden Post Office | Glidden Post Office | Carroll | 1227 | Glidden |
| Dedham Post Office | Dedham Post Office | Carroll | 1325 | Dedham |
| Coon Rapids Post Office | Coon Rapids Post Office | Carroll | 1175 | Coon Rapids South |
| Breda Post Office | Breda Post Office | Carroll | 1368 | Breda |
| Arcadia Post Office | Arcadia Post Office | Carroll | 1440 | Arcadia |
| Carroll Post Office | Carroll Post Office | Carroll | 1247 | Carroll East |
| Templeton Post Office | Templeton Post Office | Carroll | 1444 | Templeton |
| Ralston Post Office | Ralston Post Office | Carroll | 1129 | Glidden |
| Lidderdale Post Office | Lidderdale Post Office | Carroll | 1237 | Carroll East |
| Lanesboro Post Office | Lanesboro Post Office | Carroll | 1145 | Lanesboro |
| Halbur Post Office | Halbur Post Office | Carroll | 1404 | Carroll West |
| Poplar Post Office (historical) | Poplar Post Office (historical) | Audubon | 1450 | Kimballton |
| Fiscus Post Office (historical) | Fiscus Post Office (historical) | Audubon | 1316 | Kimballton |
| Price Post Office (historical) | Price Post Office (historical) | Audubon | 1388 | Gardner |
| Horace Post Office (historical) | Horace Post Office (historical) | Audubon | 1270 | Gardner |
| Louisville Post Office (historical) | Louisville Post Office (historical) | Audubon | 1263 | Exira West |
| Irwin Post Office (historical) | Irwin Post Office (historical) | Audubon | 1342 | Viola Center |
| Leroyville Post Office (historical) | Leroyville Post Office (historical) | Audubon | 1276 | Audubon |
| Viola Center Post Office (historical) | Viola Center Post Office (historical) | Audubon | 1444 | Viola Center |
| Thompson Post Office (historical) | Thompson Post Office (historical) | Audubon | 1473 | Gray |
| Ross Post Office (historical) | Ross Post Office (historical) | Audubon | 1394 | Gray |
| Conkling Post Office (historical) | Conkling Post Office (historical) | Audubon | 1470 | Gardner |
| Larland Post Office (historical) | Larland Post Office (historical) | Audubon | 1371 | Gardner |
| Melville Post Office (historical) | Melville Post Office (historical) | Audubon | 1384 | Gardner |
| Oakfield Post Office (historical) | Oakfield Post Office (historical) | Audubon | 1280 | Exira West |
| Grove Post Office (historical) | Grove Post Office (historical) | Audubon | 1302 | Exira East |
| Audubon Centre Post Office (historical) | Audubon Centre Post Office (historical) | Audubon | 1273 | Audubon |
| Kimballton Post Office | Kimballton Post Office | Audubon | 1289 | Kimballton |
| Exira Post Office | Exira Post Office | Audubon | 1253 | Exira West |
| Audubon Post Office | Audubon Post Office | Audubon | 1335 | Audubon |
| Hamlin Post Office | Hamlin Post Office | Audubon | 1260 | Audubon |
| Gray Post Office | Gray Post Office | Audubon | 1365 | Gray |
| Brayton Post Office | Brayton Post Office | Audubon | 1211 | Exira West |
| Fan Post Office (historical) | Fan Post Office (historical) | Des Moines | 715 | Pleasant Grove |
| Van Dyke Post Office (historical) | Van Dyke Post Office (historical) | Des Moines | 663 | West Burlington |
| Kline Post Office (historical) | Kline Post Office (historical) | Des Moines | 722 | Sperry |
| Franklin Mills Post Office (historical) | Franklin Mills Post Office (historical) | Des Moines | 699 | Sperry |
| Dodgeville Post Office (historical) | Dodgeville Post Office (historical) | Des Moines | 738 | Sperry |
| Pleasantgrove Post Office (historical) | Pleasantgrove Post Office (historical) | Des Moines | 722 | Pleasant Grove |
| Limestone Post Office (historical) | Limestone Post Office (historical) | Des Moines | 551 | Oakville |
| Northfield Post Office (historical) | Northfield Post Office (historical) | Des Moines | 722 | Oakville |
| Roscoe Post Office (historical) | Roscoe Post Office (historical) | Des Moines | 774 | Morning Sun |
| Gibbs Post Office (historical) | Gibbs Post Office (historical) | Des Moines | Unknown | |
| West Burlington Post Office | West Burlington Post Office | Des Moines | 696 | West Burlington |
| Burlington Post Office | Burlington Post Office | Des Moines | 538 | Burlington |
| Mediapolis Post Office | Mediapolis Post Office | Des Moines | 771 | Mediapolis |
| Yarmouth Post Office | Yarmouth Post Office | Des Moines | 810 | Morning Sun |
| Sperry Post Office | Sperry Post Office | Des Moines | 751 | Sperry |
| Middleton Post Office | Middleton Post Office | Des Moines | 728 | Danville |
| Fox Landing Post Office (historical) | Fox Landing Post Office (historical) | Des Moines | 531 | Keithsburg |
| Danville Post Office | Danville Post Office | Des Moines | 725 | Danville |
| Kossuth Post Office (historical) | Kossuth Post Office (historical) | Des Moines | 755 | Mediapolis |
| Linton Post Office (historical) | Linton Post Office (historical) | Des Moines | 738 | Mediapolis |
| Albrights Post Office (historical) | Albrights Post Office (historical) | Des Moines | 545 | Kingston |
| Cora Post Office (historical) | Cora Post Office (historical) | Des Moines | 705 | Kingston |
| Latty Post Office (historical) | Latty Post Office (historical) | Des Moines | 696 | Kingston |
| Kingston Post Office (historical) | Kingston Post Office (historical) | Des Moines | 548 | Kingston |
| Parrish Post Office (historical) | Parrish Post Office (historical) | Des Moines | 702 | Danville |
| Augusta Post Office (historical) | Augusta Post Office (historical) | Des Moines | 581 | Danville |
| Sioux City Post Office | Sioux City Post Office | Woodbury | 1102 | Sioux City South |
| Salix Post Office | Salix Post Office | Woodbury | 1083 | Salix |
| Sloan Post Office | Sloan Post Office | Woodbury | 1076 | Sloan |
| Pierson Post Office | Pierson Post Office | Woodbury | 1273 | Pierson |
| Odd Post Office (historical) | Odd Post Office (historical) | Woodbury | 1293 | Luton |
| Lozier Post Office (historical) | Lozier Post Office (historical) | Woodbury | 1329 | Kingsley |
| Linndale Post Office (historical) | Linndale Post Office (historical) | Woodbury | 1083 | Salix |
| Crawford Post Office (historical) | Crawford Post Office (historical) | Woodbury | 1194 | Lawton |
| Dodds Post Office (historical) | Dodds Post Office (historical) | Woodbury | 1158 | Lawton |
| Glenellen Post Office (historical) | Glenellen Post Office (historical) | Woodbury | 1099 | Sergeant Bluff |
| Hoskins Post Office (historical) | Hoskins Post Office (historical) | Woodbury | 1175 | Sergeant Bluff |
| Lakeport Post Office (historical) | Lakeport Post Office (historical) | Woodbury | 1063 | Salix |
| Snyder's Grove Post Office (historical) | Snyder's Grove Post Office (historical) | Woodbury | 1142 | Climbing Hill |
| Owego Post Office (historical) | Owego Post Office (historical) | Woodbury | 1070 | Luton |
| Luton Post Office (historical) | Luton Post Office (historical) | Woodbury | 1079 | Luton |
| Grange Post Office (historical) | Grange Post Office (historical) | Woodbury | 1089 | Lawton |
| Leeds Post Office (historical) | Leeds Post Office (historical) | Woodbury | 1109 | James |
| Morris Post Office (historical) | Morris Post Office (historical) | Woodbury | 1168 | Holstein SW |
| Midway Post Office (historical) | Midway Post Office (historical) | Woodbury | 1450 | Holstein SW |
| Wolfdale Post Office (historical) | Wolfdale Post Office (historical) | Woodbury | 1368 | Correctionville NW |
| Rockbranch Post Office (historical) | Rockbranch Post Office (historical) | Woodbury | 1430 | Correctionville NW |
| Luckyvalley Post Office (historical) | Luckyvalley Post Office (historical) | Woodbury | 1220 | Correctionville NW |
| Discord Post Office (historical) | Discord Post Office (historical) | Woodbury | 1102 | Correctionville |
| Climbing Hill Post Office (historical) | Climbing Hill Post Office (historical) | Woodbury | 1135 | Climbing Hill |
| German City Post Office (historical) | German City Post Office (historical) | Woodbury | 1112 | Climbing Hill |
| Holly Springs Post Office (historical) | Holly Springs Post Office (historical) | Woodbury | 1076 | Climbing Hill |
| Piero Post Office (historical) | Piero Post Office (historical) | Woodbury | 1138 | Oto |
| Idell Post Office (historical) | Idell Post Office (historical) | Woodbury | Unknown | |
| Floyd's Bluff Post Office (historical) | Floyd's Bluff Post Office (historical) | Woodbury | Unknown | |
| Copenhaver Post Office (historical) | Copenhaver Post Office (historical) | Woodbury | Unknown | |
| Barlow Hall Post Office (historical) | Barlow Hall Post Office (historical) | Woodbury | Unknown | |
| Cushing Post Office | Cushing Post Office | Woodbury | 1280 | Cushing |
| Smithland Post Office | Smithland Post Office | Woodbury | 1086 | Smithland |
| Oto Post Office | Oto Post Office | Woodbury | 1089 | Oto |
| Sergeant Bluff Post Office | Sergeant Bluff Post Office | Woodbury | 1093 | Sergeant Bluff |
| Moville Post Office | Moville Post Office | Woodbury | 1175 | Moville |
| Lawton Post Office | Lawton Post Office | Woodbury | 1184 | Lawton |
| Hornick Post Office | Hornick Post Office | Woodbury | 1066 | Hornick |
| Danbury Post Office | Danbury Post Office | Woodbury | 1161 | Danbury |
| Correctionville Post Office | Correctionville Post Office | Woodbury | 1125 | Correctionville |
| Bronson Post Office | Bronson Post Office | Woodbury | 1106 | Lawton |
| Anthon Post Office | Anthon Post Office | Woodbury | 1115 | Correctionville |
| Elmgrove Post Office (historical) | Elmgrove Post Office (historical) | Calhoun | 1171 | Yetter |
| Yetter Post Office (historical) | Yetter Post Office (historical) | Calhoun | 1227 | Yetter |
| Wightman Post Office (historical) | Wightman Post Office (historical) | Calhoun | 1165 | Wightman |
| Twin Lakes Post Office (historical) | Twin Lakes Post Office (historical) | Calhoun | 1211 | Rockwell City |
| Lavinia Post Office (historical) | Lavinia Post Office (historical) | Calhoun | 1217 | Rockwell City |
| Richards Post Office (historical) | Richards Post Office (historical) | Calhoun | 1184 | Richard |
| Burns Post Office (historical) | Burns Post Office (historical) | Calhoun | 1211 | Lytton |
| Rands Post Office (historical) | Rands Post Office (historical) | Calhoun | 1181 | Lohrville |
| Sherwood Post Office (historical) | Sherwood Post Office (historical) | Calhoun | 1230 | Lake City |
| Knoke Post Office (historical) | Knoke Post Office (historical) | Calhoun | 1230 | Fonda |
| Crandall Post Office (historical) | Crandall Post Office (historical) | Calhoun | 1201 | Lytton |
| Rinard Post Office (historical) | Rinard Post Office (historical) | Calhoun | 1165 | Farnhamville |
| Muddy Post Office (historical) | Muddy Post Office (historical) | Calhoun | 1155 | Farnhamville |
| Kissimmee Post Office (historical) | Kissimmee Post Office (historical) | Calhoun | Unknown | |
| Rockwell City Post Office | Rockwell City Post Office | Calhoun | 1234 | Rockwell City |
| Somers Post Office | Somers Post Office | Calhoun | 1158 | Knierim |
| Pomeroy Post Office | Pomeroy Post Office | Calhoun | 1240 | Pomeroy |
| Manson Post Office | Manson Post Office | Calhoun | 1240 | Manson |
| Lohrville Post Office | Lohrville Post Office | Calhoun | 1155 | Lohrville |
| Lake City Post Office | Lake City Post Office | Calhoun | 1243 | Lake City |
| Knierim Post Office | Knierim Post Office | Calhoun | 1181 | Knierim |
| Farnhamville Post Office | Farnhamville Post Office | Calhoun | 1138 | Farnhamville |
| Jolley Post Office | Jolley Post Office | Calhoun | 1234 | Rockwell City |
| Cedar Creek Post Office (historical) | Cedar Creek Post Office (historical) | Greene | 1083 | Wightman |
| Sarney Post Office (historical) | Sarney Post Office (historical) | Greene | 1188 | Wightman |
| Surry Post Office (historical) | Surry Post Office (historical) | Greene | 1024 | Rippey |
| Farlin Post Office (historical) | Farlin Post Office (historical) | Greene | 1073 | Jefferson West |
| Adaza Post Office (historical) | Adaza Post Office (historical) | Greene | 1122 | Churdan |
| Kendrick Post Office (historical) | Kendrick Post Office (historical) | Greene | Unknown | |
| Jefferson Post Office | Jefferson Post Office | Greene | 1063 | Jefferson West |
| Scranton Post Office | Scranton Post Office | Greene | 1178 | Scranton |
| Rippey Post Office | Rippey Post Office | Greene | 1076 | Rippey |
| Paton Post Office | Paton Post Office | Greene | 1106 | Paton |
| Grand Junction Post Office | Grand Junction Post Office | Greene | 1033 | Grand Junction |
| Dana Post Office | Dana Post Office | Greene | 1122 | Grand Junction |
| Calhoun Post Office (historical) | Calhoun Post Office (historical) | Calhoun | 1142 | Lohrville |
| Cooper Post Office | Cooper Post Office | Greene | 1073 | Cooper |
| Churdan Post Office | Churdan Post Office | Greene | 1115 | Churdan |
| Safeside Post Office (historical) | Safeside Post Office (historical) | Guthrie | 1365 | Casey |
| Jobes Post Office (historical) | Jobes Post Office (historical) | Guthrie | 1473 | Adair North |
| Herndon Post Office (historical) | Herndon Post Office (historical) | Guthrie | 1060 | Yale |
| Dale Post Office (historical) | Dale Post Office (historical) | Guthrie | 1004 | Stuart North |
| West Milton Post Office (historical) | West Milton Post Office (historical) | Guthrie | 997 | Stuart North |
| Graceville Post Office (historical) | Graceville Post Office (historical) | Guthrie | 1260 | North Branch |
| Harrison Post Office (historical) | Harrison Post Office (historical) | Guthrie | 1434 | North Branch |
| Beargrove Post Office (historical) | Beargrove Post Office (historical) | Guthrie | 1375 | North Branch |
| North Branch Post Office (historical) | North Branch Post Office (historical) | Guthrie | 1404 | North Branch |
| Nelson Post Office (historical) | Nelson Post Office (historical) | Guthrie | 1437 | North Branch |
| Glendon Post Office (historical) | Glendon Post Office (historical) | Guthrie | 1043 | Menlo |
| Ridgeway Post Office (historical) | Ridgeway Post Office (historical) | Guthrie | 1263 | Menlo |
| Ava Post Office (historical) | Ava Post Office (historical) | Guthrie | 1037 | Menlo |
| Mada Post Office (historical) | Mada Post Office (historical) | Guthrie | 1145 | Guthrie Center West |
| Wichita Post Office (historical) | Wichita Post Office (historical) | Guthrie | 1165 | Guthrie Center West |
| Monteith Post Office (historical) | Monteith Post Office (historical) | Guthrie | 1060 | Guthrie Center East |
| Fanslers Post Office (historical) | Fanslers Post Office (historical) | Guthrie | 1076 | Guthrie Center East |
| Brushy Valley Post Office (historical) | Brushy Valley Post Office (historical) | Guthrie | 1234 | Coon Rapids South |
| Orange Grove Post Office (historical) | Orange Grove Post Office (historical) | Guthrie | 1191 | Coon Rapids South |
| Tuttle Grove Post Office (historical) | Tuttle Grove Post Office (historical) | Guthrie | 1276 | Coon Rapids South |
| Erastus Post Office (historical) | Erastus Post Office (historical) | Guthrie | 1266 | Coon Rapids South |
| Dalmanutha Post Office (historical) | Dalmanutha Post Office (historical) | Guthrie | 1348 | Casey |
| Moffit Post Office (historical) | Moffit Post Office (historical) | Guthrie | 1207 | Bagley |
| Stuart Post Office | Stuart Post Office | Guthrie | 1204 | Stuart North |
| Panora Post Office | Panora Post Office | Guthrie | 1070 | Panora |
| Menlo Post Office | Menlo Post Office | Guthrie | 1266 | Menlo |
| Guthrie Center Post Office | Guthrie Center Post Office | Guthrie | 1122 | Guthrie Center West |
| Casey Post Office | Casey Post Office | Guthrie | 1263 | Casey |
| Bayard Post Office | Bayard Post Office | Guthrie | 1135 | Bayard |
| Bagley Post Office | Bagley Post Office | Guthrie | 1102 | Bagley |
| Yale Post Office | Yale Post Office | Guthrie | 1129 | Yale |
| Jamaica Post Office | Jamaica Post Office | Guthrie | 1043 | Yale |
| Moran Post Office (historical) | Moran Post Office (historical) | Dallas | 935 | Woodward |
| Ortonville Post Office (historical) | Ortonville Post Office (historical) | Dallas | 1037 | Waukee |
| Gardiner Post Office (historical) | Gardiner Post Office (historical) | Dallas | 951 | Perry |
| Ephesus Post Office (historical) | Ephesus Post Office (historical) | Dallas | 994 | Adel NW |
| Langfitt Post Office (historical) | Langfitt Post Office (historical) | Dallas | 988 | Adel NW |
| Panther Post Office (historical) | Panther Post Office (historical) | Dallas | 1014 | Panther |
| Linn Post Office (historical) | Linn Post Office (historical) | Dallas | 1122 | Panora |
| Ingersoll Post Office (historical) | Ingersoll Post Office (historical) | Dallas | 850 | Grimes |
| Fairland Post Office (historical) | Fairland Post Office (historical) | Dallas | 988 | Dallas Center |
| Osprey Post Office (historical) | Osprey Post Office (historical) | Dallas | 997 | Grimes |
| Brough Post Office (historical) | Brough Post Office (historical) | Dallas | 1043 | Adel NW |
| Kennedy Post Office (historical) | Kennedy Post Office (historical) | Dallas | 951 | Adel |
| Chattanooga Post Office (historical) | Chattanooga Post Office (historical) | Dallas | 1063 | Adel |
| Uncle Sam Post Office (historical) | Uncle Sam Post Office (historical) | Dallas | Unknown | |
| Chicago Post Office (historical) | Chicago Post Office (historical) | Dallas | Unknown | |
| Waukee Post Office | Waukee Post Office | Dallas | 1027 | Waukee |
| Woodward Post Office | Woodward Post Office | Dallas | 1066 | Woodward |
| Van Meter Post Office | Van Meter Post Office | Dallas | 876 | Waukee |
| Redfield Post Office | Redfield Post Office | Dallas | 968 | Redfield |
| Minburn Post Office | Minburn Post Office | Dallas | 1043 | Perry |
| Granger Post Office | Granger Post Office | Dallas | 886 | Granger |
| Dexter Post Office | Dexter Post Office | Dallas | 1148 | Redfield |
| De Soto Post Office | De Soto Post Office | Dallas | 951 | Adel |
| Dallas Center Post Office | Dallas Center Post Office | Dallas | 1070 | Dallas Center |
| Perry Post Office | Perry Post Office | Dallas | 965 | Perry |
| Linden Post Office | Linden Post Office | Dallas | 1132 | Panora |
| Dawson Post Office | Dawson Post Office | Dallas | 1037 | Dawson |
| Bouton Post Office | Bouton Post Office | Dallas | 951 | Perry |
| Booneville Post Office | Booneville Post Office | Dallas | 853 | Waukee |
| Adel Post Office | Adel Post Office | Dallas | 919 | Adel |
| Zenorsville Post Office (historical) | Zenorsville Post Office (historical) | Boone | 988 | Ames West |
| Jordan Post Office (historical) | Jordan Post Office (historical) | Boone | 1102 | Boone East |
| Riverside Post Office (historical) | Riverside Post Office (historical) | Boone | 1112 | Boone West |
| Incline Post Office (historical) | Incline Post Office (historical) | Boone | 1066 | Boone West |
| River Side Post Office (historical) | River Side Post Office (historical) | Boone | 1066 | Boone West |
| Angus Post Office (historical) | Angus Post Office (historical) | Boone | 1024 | Rippey |
| Jehu Post Office (historical) | Jehu Post Office (historical) | Boone | 1040 | Madrid NW |
| Marcy Post Office (historical) | Marcy Post Office (historical) | Boone | 1083 | Madrid NW |
| Prairie Hill Post Office (historical) | Prairie Hill Post Office (historical) | Boone | 1079 | Madrid NW |
| Rosendale Post Office (historical) | Rosendale Post Office (historical) | Boone | 1093 | Ames NW |
| Mackey Post Office (historical) | Mackey Post Office (historical) | Boone | 1007 | Mackey |
| Griffin Post Office (historical) | Griffin Post Office (historical) | Boone | 1030 | Mackey |
| Belle Point Post Office (historical) | Belle Point Post Office (historical) | Boone | 1063 | Luther |
| Garden Post Office (historical) | Garden Post Office (historical) | Boone | 1053 | Luther |
| Worth Post Office (historical) | Worth Post Office (historical) | Boone | 1076 | Luther |
| Mineral Ridge Post Office (historical) | Mineral Ridge Post Office (historical) | Boone | 1194 | Fraser |
| Fraser Post Office (historical) | Fraser Post Office (historical) | Boone | 961 | Fraser |
| Carson's Point Post Office (historical) | Carson's Point Post Office (historical) | Boone | 1152 | Fraser |
| Berkley Post Office (historical) | Berkley Post Office (historical) | Boone | 988 | Berkley |
| Renner Post Office (historical) | Renner Post Office (historical) | Boone | Unknown | |
| Rapids Post Office (historical) | Rapids Post Office (historical) | Boone | Unknown | |
| Boone Post Office | Boone Post Office | Boone | 1135 | Boone West |
| Madrid Post Office | Madrid Post Office | Boone | 1017 | Luther |
| Boxholm Post Office | Boxholm Post Office | Boone | 1155 | Boxholm |
| Pilot Mound Post Office | Pilot Mound Post Office | Boone | 1106 | Boxholm |
| Ogden Post Office | Ogden Post Office | Boone | 1089 | Ogden |
| Moingona Post Office (historical) | Moingona Post Office (historical) | Boone | 919 | Boone West |
| Luther Post Office (historical) | Luther Post Office (historical) | Boone | 1099 | Luther |
| Beaver Post Office | Beaver Post Office | Boone | 1024 | Grand Junction |
| Boonesboro Post Office (historical) | Boonesboro Post Office (historical) | Boone | 1112 | Boone West |
| Industry Post Office (historical) | Industry Post Office (historical) | Webster | 1125 | Vincent |
| Belleville Post Office (historical) | Belleville Post Office (historical) | Webster | 919 | Stratford |
| Casady Post Office (historical) | Casady Post Office (historical) | Webster | 1135 | Boxholm |
| McGuire Post Office (historical) | McGuire Post Office (historical) | Webster | 1017 | Stratford |
| Lena Post Office (historical) | Lena Post Office (historical) | Webster | 1129 | Paton |
| Roelyn Post Office (historical) | Roelyn Post Office (historical) | Webster | 1161 | Moorland |
| Linnburg Post Office (historical) | Linnburg Post Office (historical) | Webster | 925 | Lehigh |
| Lanyon Post Office (historical) | Lanyon Post Office (historical) | Webster | 1175 | Lanyon |
| Lundgren Post Office (historical) | Lundgren Post Office (historical) | Webster | 1145 | Harcourt |
| Crooks Post Office (historical) | Crooks Post Office (historical) | Webster | 1161 | Harcourt |
| Palmgrove Post Office (historical) | Palmgrove Post Office (historical) | Webster | 1161 | Harcourt |
| Greenside Post Office (historical) | Greenside Post Office (historical) | Webster | 1125 | Fort Dodge South |
| Coalville Post Office (historical) | Coalville Post Office (historical) | Webster | 1119 | Fort Dodge South |
| Kalo Post Office (historical) | Kalo Post Office (historical) | Webster | 978 | Fort Dodge South |
| Shady Oak Post Office (historical) | Shady Oak Post Office (historical) | Webster | 978 | Fort Dodge South |
| Carbon Junction Post Office (historical) | Carbon Junction Post Office (historical) | Webster | 1115 | Fort Dodge South |
| Carbon Post Office (historical) | Carbon Post Office (historical) | Webster | 1115 | Fort Dodge South |
| Gypsum Post Office (historical) | Gypsum Post Office (historical) | Webster | 1115 | Fort Dodge South |
| Latham Post Office (historical) | Latham Post Office (historical) | Webster | 1033 | Fort Dodge North |
| Slifer Post Office (historical) | Slifer Post Office (historical) | Webster | 1142 | Farnhamville |
| Brushy Post Office (historical) | Brushy Post Office (historical) | Webster | 1096 | Evanston |
| Border Plains Post Office (historical) | Border Plains Post Office (historical) | Webster | 1079 | Evanston |
| Evanston Post Office (historical) | Evanston Post Office (historical) | Webster | 1106 | Evanston |
| Judd Post Office (historical) | Judd Post Office (historical) | Webster | 1112 | Evanston |
| Flugstad Post Office (historical) | Flugstad Post Office (historical) | Webster | 1109 | Duncombe |
| Jackson Centre Post Office (historical) | Jackson Centre Post Office (historical) | Webster | 1138 | Fort Dodge South |
| McLaughlin's Grove Post Office (historical) | McLaughlin's Grove Post Office (historical) | Webster | 1145 | Moorland |
| Kentuck Grove Post Office (historical) | Kentuck Grove Post Office (historical) | Webster | Unknown | |
| Clayworks Post Office (historical) | Clayworks Post Office (historical) | Webster | Unknown | |
| Badger Creek Post Office (historical) | Badger Creek Post Office (historical) | Webster | Unknown | |
| Badger Mound Post Office (historical) | Badger Mound Post Office (historical) | Webster | Unknown | |
| Fort Dodge Post Office | Fort Dodge Post Office | Webster | 1112 | Fort Dodge South |
| Vincent Post Office | Vincent Post Office | Webster | 1135 | Vincent |
| Otho Post Office (historical) | Otho Post Office (historical) | Webster | 1122 | Fort Dodge South |
| Moorland Post Office | Moorland Post Office | Webster | 1152 | Moorland |
| Lehigh Post Office | Lehigh Post Office | Webster | 951 | Lehigh |
| Harcourt Post Office | Harcourt Post Office | Webster | 1171 | Harcourt |
| Gowrie Post Office | Gowrie Post Office | Webster | 1135 | Gowrie |
| Duncombe Post Office | Duncombe Post Office | Webster | 1109 | Duncombe |
| Dayton Post Office | Dayton Post Office | Webster | 1132 | Lehigh |
| Clare Post Office | Clare Post Office | Webster | 1214 | Clare |
| Callender Post Office | Callender Post Office | Webster | 1155 | Gowrie |
| Burnside Post Office | Burnside Post Office | Webster | 1142 | Lehigh |
| Barnum Post Office | Barnum Post Office | Webster | 1178 | Clare |
| Badger Post Office | Badger Post Office | Webster | 1158 | Fort Dodge North |
| Poplar Grove Post Office (historical) | Poplar Grove Post Office (historical) | Hamilton | 1109 | Webster City |
| Hook's Point Post Office (historical) | Hook's Point Post Office (historical) | Hamilton | 1086 | Stratford |
| Tunnel Post Office (historical) | Tunnel Post Office (historical) | Hamilton | 974 | Stanhope |
| Lake Center Post Office (historical) | Lake Center Post Office (historical) | Hamilton | 1119 | Stanhope |
| Homer Post Office (historical) | Homer Post Office (historical) | Hamilton | 1102 | Stratford |
| Highview Post Office (historical) | Highview Post Office (historical) | Hamilton | 1135 | Duncombe |
| Russell's Grove Post Office (historical) | Russell's Grove Post Office (historical) | Hamilton | 1115 | Duncombe |
| Callanan Post Office (historical) | Callanan Post Office (historical) | Hamilton | Unknown | |
| Williams Post Office | Williams Post Office | Hamilton | 1214 | Williams |
| Webster City Post Office | Webster City Post Office | Hamilton | 1043 | Webster City |
| Stratford Post Office | Stratford Post Office | Hamilton | 1112 | Stratford |
| Stanhope Post Office | Stanhope Post Office | Hamilton | 1115 | Stanhope |
| Jewell Post Office | Jewell Post Office | Hamilton | 1056 | Jewell |
| Blairsburg Post Office | Blairsburg Post Office | Hamilton | 1230 | Blairsburg |
| Ellsworth Post Office | Ellsworth Post Office | Hamilton | 1086 | Ellsworth |
| Lakin's Grove Post Office (historical) | Lakin's Grove Post Office (historical) | Hamilton | 1102 | Ellsworth |
| Kamrar Post Office | Kamrar Post Office | Hamilton | 1115 | Blairsburg |
| Randall Post Office | Randall Post Office | Hamilton | 1027 | Story City |
| Capron Post Office (historical) | Capron Post Office (historical) | Marshall | 1043 | Melbourne |
| Galvin Post Office (historical) | Galvin Post Office (historical) | Marshall | 948 | LaMoille |
| Hartland Post Office (historical) | Hartland Post Office (historical) | Marshall | 1010 | LaMoille |
| Bangor Post Office (historical) | Bangor Post Office (historical) | Marshall | 1010 | Union |
| Bromley Post Office (historical) | Bromley Post Office (historical) | Marshall | 935 | State Center |
| Malta Post Office (historical) | Malta Post Office (historical) | Marshall | 1056 | Melbourne |
| Vancleve Post Office (historical) | Vancleve Post Office (historical) | Marshall | 1050 | Melbourne |
| Reedsville Post Office (historical) | Reedsville Post Office (historical) | Marshall | 974 | Le Grand |
| Gowanda Post Office (historical) | Gowanda Post Office (historical) | Marshall | 965 | Le Grand |
| Rockton Post Office (historical) | Rockton Post Office (historical) | Marshall | 883 | Le Grand |
| Quarry Post Office (historical) | Quarry Post Office (historical) | Marshall | 889 | Le Grand |
| La Moille Post Office (historical) | La Moille Post Office (historical) | Marshall | 968 | LaMoille |
| Marietta Post Office (historical) | Marietta Post Office (historical) | Marshall | 892 | LaMoille |
| Pickering Post Office (historical) | Pickering Post Office (historical) | Marshall | 1014 | Gilman |
| Dunbar Post Office (historical) | Dunbar Post Office (historical) | Marshall | 938 | Gilman |
| Dillon Post Office (historical) | Dillon Post Office (historical) | Marshall | 978 | Gilman |
| Maulsby Post Office (historical) | Maulsby Post Office (historical) | Marshall | 988 | Conrad West |
| Vienna Post Office (historical) | Vienna Post Office (historical) | Marshall | 1056 | Conrad East |
| Marshalltown Post Office | Marshalltown Post Office | Marshall | 928 | Marshalltown |
| State Center Post Office | State Center Post Office | Marshall | 1070 | State Center |
| Saint Anthony Post Office | Saint Anthony Post Office | Marshall | 1010 | State Center |
| Rhodes Post Office | Rhodes Post Office | Marshall | 1024 | Rhodes |
| Melbourne Post Office | Melbourne Post Office | Marshall | 1043 | Melbourne |
| Liscomb Post Office | Liscomb Post Office | Marshall | 1010 | Union |
| Le Grand Post Office | Le Grand Post Office | Marshall | 932 | Le Grand |
| Laurel Post Office | Laurel Post Office | Marshall | 1040 | Laurel |
| Haverhill Post Office | Haverhill Post Office | Marshall | 1017 | Laurel |
| Green Mountain Post Office | Green Mountain Post Office | Marshall | 994 | Le Grand |
| Gilman Post Office | Gilman Post Office | Marshall | 1030 | Gilman |
| Ferguson Post Office | Ferguson Post Office | Marshall | 919 | Gilman |
| Clemons Post Office | Clemons Post Office | Marshall | 955 | State Center |
| Albion Post Office | Albion Post Office | Marshall | 958 | Marshalltown |
| Luray Post Office (historical) | Luray Post Office (historical) | Marshall | 935 | Laurel |
| Carnforth Post Office (historical) | Carnforth Post Office (historical) | Poweshiek | 830 | Victor |
| Stilwell Post Office (historical) | Stilwell Post Office (historical) | Poweshiek | 784 | Searsboro |
| Foresthome Post Office (historical) | Foresthome Post Office (historical) | Poweshiek | 866 | Montezuma |
| Ewart Post Office (historical) | Ewart Post Office (historical) | Poweshiek | 971 | Malcom |
| Jacobs Post Office (historical) | Jacobs Post Office (historical) | Poweshiek | 981 | Grinnell South |
| Oakgrove Post Office (historical) | Oakgrove Post Office (historical) | Poweshiek | 981 | Grinnell South |
| Sugar Grove Post Office (historical) | Sugar Grove Post Office (historical) | Poweshiek | Unknown | |
| Sonora Post Office (historical) | Sonora Post Office (historical) | Poweshiek | 906 | Grinnell North |
| Chester Center Post Office (historical) | Chester Center Post Office (historical) | Poweshiek | 997 | Grinnell North |
| Tilton Post Office (historical) | Tilton Post Office (historical) | Poweshiek | 902 | Barnes City |
| Tilton Post Office (historical) | Tilton Post Office (historical) | Poweshiek | 843 | Deep River |
| Western Post Office (historical) | Western Post Office (historical) | Poweshiek | Unknown | |
| Prairie Creek Post Office (historical) | Prairie Creek Post Office (historical) | Poweshiek | Unknown | |
| Jacob Post Office (historical) | Jacob Post Office (historical) | Poweshiek | Unknown | |
| Gilead Post Office (historical) | Gilead Post Office (historical) | Poweshiek | Unknown | |
| Glencoe Post Office (historical) | Glencoe Post Office (historical) | Poweshiek | Unknown | |
| Coells Post Office (historical) | Coells Post Office (historical) | Poweshiek | Unknown | |
| Clearfield Post Office (historical) | Clearfield Post Office (historical) | Poweshiek | Unknown | |
| Brooklyn Post Office (historical) | Brooklyn Post Office (historical) | Poweshiek | 846 | Brooklyn |
| East Brooklyn Post Office (historical) | East Brooklyn Post Office (historical) | Poweshiek | 846 | Brooklyn |
| Montezuma Post Office | Montezuma Post Office | Poweshiek | 955 | Montezuma |
| Malcom Post Office | Malcom Post Office | Poweshiek | 935 | Malcom |
| Hartwick Post Office | Hartwick Post Office | Poweshiek | 932 | Hartwick |
| Deep River Post Office | Deep River Post Office | Poweshiek | 909 | Deep River |
| Brooklyn Post Office | Brooklyn Post Office | Poweshiek | 856 | Brooklyn |
| Grinnell Post Office | Grinnell Post Office | Poweshiek | 1020 | Grinnell South |
| Searsboro Post Office | Searsboro Post Office | Poweshiek | 846 | Searsboro |
| Guernsey Post Office (historical) | Guernsey Post Office (historical) | Poweshiek | 823 | Victor |
| Mormon Hill Post Office (historical) | Mormon Hill Post Office (historical) | Hardin | 1004 | Union |
| Midland Post Office (historical) | Midland Post Office (historical) | Hardin | 974 | New Providence |
| Quebec Post Office (historical) | Quebec Post Office (historical) | Hardin | 1161 | New Providence |
| Pokeepsie Post Office (historical) | Pokeepsie Post Office (historical) | Hardin | Unknown | |
| Abbott Post Office (historical) | Abbott Post Office (historical) | Hardin | 1099 | Steamboat Rock |
| Cleves Post Office (historical) | Cleves Post Office (historical) | Hardin | 1076 | Steamboat Rock |
| La Yerba Post Office (historical) | La Yerba Post Office (historical) | Hardin | 1073 | Steamboat Rock |
| Eagle City Post Office (historical) | Eagle City Post Office (historical) | Hardin | 1001 | Owasa |
| Link Post Office (historical) | Link Post Office (historical) | Hardin | 1135 | Owasa |
| Berlin Post Office (historical) | Berlin Post Office (historical) | Hardin | 1135 | Owasa |
| Hardin City Post Office (historical) | Hardin City Post Office (historical) | Hardin | 988 | Owasa |
| Rickord Post Office (historical) | Rickord Post Office (historical) | Hardin | 988 | Owasa |
| Hughes Post Office (historical) | Hughes Post Office (historical) | Hardin | 1102 | Owasa |
| Owasa Post Office (historical) | Owasa Post Office (historical) | Hardin | 1086 | Owasa |
| Bunker Hill Post Office (historical) | Bunker Hill Post Office (historical) | Hardin | 1063 | New Providence |
| Lawnhill Post Office (historical) | Lawnhill Post Office (historical) | Hardin | 1089 | New Providence |
| Point Pleasant Post Office (historical) | Point Pleasant Post Office (historical) | Hardin | 1102 | New Providence |
| Rathon Post Office (historical) | Rathon Post Office (historical) | Hardin | 1158 | Iowa Falls East |
| Macy Post Office (historical) | Macy Post Office (historical) | Hardin | 1158 | Iowa Falls East |
| Robertson Post Office (historical) | Robertson Post Office (historical) | Hardin | 1178 | Iowa Falls East |
| Idaho Post Office (historical) | Idaho Post Office (historical) | Hardin | 1112 | Hubbard |
| Sherman Post Office (historical) | Sherman Post Office (historical) | Hardin | 1138 | Hubbard |
| Delanti Post Office (historical) | Delanti Post Office (historical) | Hardin | 945 | Eldora |
| Xenia Post Office (historical) | Xenia Post Office (historical) | Hardin | 945 | Eldora |
| Secor Post Office (historical) | Secor Post Office (historical) | Hardin | 945 | Eldora |
| Eldora Junction Post Office (historical) | Eldora Junction Post Office (historical) | Hardin | 958 | Eldora |
| Whitten Post Office | Whitten Post Office | Hardin | 1037 | Eldora |
| Wilke Post Office (historical) | Wilke Post Office (historical) | Hardin | 1148 | Buckeye West |
| Cottage Post Office (historical) | Cottage Post Office (historical) | Hardin | 1112 | Buckeye East |
| Ellis Post Office (historical) | Ellis Post Office (historical) | Hardin | 1171 | Buckeye East |
| Iowa Falls Post Office | Iowa Falls Post Office | Hardin | 1115 | Iowa Falls West |
| Union Post Office | Union Post Office | Hardin | 932 | Union |
| Steamboat Rock Post Office | Steamboat Rock Post Office | Hardin | 1010 | Steamboat Rock |
| Ackley Post Office | Ackley Post Office | Hardin | 1086 | Ackley |
| Radcliffe Post Office | Radcliffe Post Office | Hardin | 1194 | Radcliffe |
| Hubbard Post Office | Hubbard Post Office | Hardin | 1099 | Hubbard |
| Eldora Post Office | Eldora Post Office | Hardin | 1073 | Eldora |
| Gifford Post Office (historical) | Gifford Post Office (historical) | Hardin | 948 | Eldora |
| Garden City Post Office | Garden City Post Office | Hardin | 1204 | McCallsburg |
| New Providence Post Office | New Providence Post Office | Hardin | 1132 | New Providence |
| Buckeye Post Office (historical) | Buckeye Post Office (historical) | Hardin | 1155 | Buckeye East |
| Alden Post Office | Alden Post Office | Hardin | 1112 | Popejoy |
| Boardman Post Office (historical) | Boardman Post Office (historical) | Story | 1020 | Ames NW |
| Summit Post Office (historical) | Summit Post Office (historical) | Story | 1040 | Ames NW |
| Sunset Post Office (historical) | Sunset Post Office (historical) | Story | 1070 | Zearing |
| Sheffield Post Office (historical) | Sheffield Post Office (historical) | Story | 994 | Story City |
| Johnsons Grove Post Office (historical) | Johnsons Grove Post Office (historical) | Story | 1037 | Colo |
| Fernald Post Office (historical) | Fernald Post Office (historical) | Story | 1040 | Nevada |
| Iowa Center Post Office (historical) | Iowa Center Post Office (historical) | Story | 945 | Maxwell |
| Elwell Post Office (historical) | Elwell Post Office (historical) | Story | 1014 | Maxwell |
| Shipley Post Office (historical) | Shipley Post Office (historical) | Story | 958 | Huxley |
| Point Palestine Post Office (historical) | Point Palestine Post Office (historical) | Story | 1007 | Huxley |
| Colbyville Post Office (historical) | Colbyville Post Office (historical) | Story | 1037 | Huxley |
| Camden Post Office (historical) | Camden Post Office (historical) | Story | 1037 | Ames East |
| Ontario Post Office (historical) | Ontario Post Office (historical) | Story | 1020 | Ames West |
| Johnston Grove Post Office (historical) | Johnston Grove Post Office (historical) | Story | Unknown | |
| Ames Post Office | Ames Post Office | Story | 922 | Ames East |
| Zearing Post Office | Zearing Post Office | Story | 1053 | Zearing |
| Story City Post Office | Story City Post Office | Story | 1004 | Story City |
| Slater Post Office | Slater Post Office | Story | 1037 | Slater |
| Roland Post Office | Roland Post Office | Story | 1030 | Story City |
| McCallsburg Post Office | McCallsburg Post Office | Story | 1086 | McCallsburg |
| Maxwell Post Office | Maxwell Post Office | Story | 876 | Maxwell |
| Huxley Post Office | Huxley Post Office | Story | 1030 | Huxley |
| Gilbert Post Office | Gilbert Post Office | Story | 991 | Ames West |
| Collins Post Office | Collins Post Office | Story | 997 | Collins |
| Cambridge Post Office | Cambridge Post Office | Story | 866 | Huxley |
| Nevada Post Office | Nevada Post Office | Story | 1001 | Nevada |
| Colo Post Office | Colo Post Office | Story | 1040 | Colo |
| Kelley Post Office | Kelley Post Office | Story | 1030 | Slater |
| Chalybeate Springs Post Office (historical) | Chalybeate Springs Post Office (historical) | Jasper | 840 | Colfax |
| Williamsville Post Office (historical) | Williamsville Post Office (historical) | Jasper | 922 | Mitchellville |
| Draper Post Office (historical) | Draper Post Office (historical) | Jasper | 850 | Monroe |
| Sugar Creek Post Office (historical) | Sugar Creek Post Office (historical) | Jasper | 892 | Sully |
| Prairiebell Post Office (historical) | Prairiebell Post Office (historical) | Jasper | 915 | Runnells |
| Vandalia Post Office (historical) | Vandalia Post Office (historical) | Jasper | 906 | Runnells |
| Eliot Post Office (historical) | Eliot Post Office (historical) | Jasper | 925 | Prairie City |
| Fairmount Post Office (historical) | Fairmount Post Office (historical) | Jasper | 925 | Prairie City |
| North Skunk River Post Office (historical) | North Skunk River Post Office (historical) | Jasper | 817 | Oakland Acres |
| Turner Post Office (historical) | Turner Post Office (historical) | Jasper | 892 | Oakland Acres |
| Newburg Post Office (historical) | Newburg Post Office (historical) | Jasper | 1027 | Newburg |
| Warren Grove Post Office (historical) | Warren Grove Post Office (historical) | Jasper | 853 | Monroe |
| Morristown Post Office (historical) | Morristown Post Office (historical) | Jasper | 883 | Mingo |
| Oswalt Post Office (historical) | Oswalt Post Office (historical) | Jasper | 843 | Mitchellville |
| Valeria Post Office (historical) | Valeria Post Office (historical) | Jasper | 873 | Mitchellville |
| Greencastle Post Office (historical) | Greencastle Post Office (historical) | Jasper | 915 | Mitchellville |
| Clyde Post Office (historical) | Clyde Post Office (historical) | Jasper | 974 | Mingo |
| Elk Creek Post Office (historical) | Elk Creek Post Office (historical) | Jasper | 883 | Killduff |
| Galesburg Post Office (historical) | Galesburg Post Office (historical) | Jasper | 896 | Killduff |
| Amboy Post Office (historical) | Amboy Post Office (historical) | Jasper | 965 | Kellogg |
| Pleasant View Post Office (historical) | Pleasant View Post Office (historical) | Jasper | 928 | Kellogg |
| Murphy Post Office (historical) | Murphy Post Office (historical) | Jasper | 827 | Kellogg |
| Parkersburgh Post Office (historical) | Parkersburgh Post Office (historical) | Jasper | 787 | Colfax |
| Bush Post Office (historical) | Bush Post Office (historical) | Jasper | 778 | Colfax |
| Metz Post Office (historical) | Metz Post Office (historical) | Jasper | 810 | Colfax |
| Goddard Post Office (historical) | Goddard Post Office (historical) | Jasper | 814 | Colfax |
| Seevers Post Office (historical) | Seevers Post Office (historical) | Jasper | 853 | Colfax |
| Horn Post Office (historical) | Horn Post Office (historical) | Jasper | 912 | Baxter SE |
| Ira Post Office (historical) | Ira Post Office (historical) | Jasper | 856 | Baxter |
| Dawson Post Office (historical) | Dawson Post Office (historical) | Jasper | 1010 | Baxter |
| Adamsonville Post Office (historical) | Adamsonville Post Office (historical) | Jasper | 932 | Kellogg |
| Minerva Post Office (historical) | Minerva Post Office (historical) | Jasper | Unknown | |
| Sully Post Office | Sully Post Office | Jasper | 919 | Sully |
| Prairie City Post Office | Prairie City Post Office | Jasper | 928 | Prairie City |
| Reasnor Post Office | Reasnor Post Office | Jasper | 761 | Monroe |
| Monroe Post Office | Monroe Post Office | Jasper | 922 | Monroe |
| Mingo Post Office | Mingo Post Office | Jasper | 837 | Mingo |
| Lynnville Post Office | Lynnville Post Office | Jasper | 817 | Sully |
| Kellogg Post Office | Kellogg Post Office | Jasper | 892 | Kellogg |
| Killduff Post Office | Killduff Post Office | Jasper | 922 | Killduff |
| Colfax Post Office | Colfax Post Office | Jasper | 817 | Colfax |
| Baxter Post Office | Baxter Post Office | Jasper | 1004 | Baxter |
| Dairy Grove Post Office (historical) | Dairy Grove Post Office (historical) | Jasper | 873 | Killduff |
| Dove Post Office (historical) | Dove Post Office (historical) | Iowa | 794 | Hartwick |
| Fox Post Office (historical) | Fox Post Office (historical) | Iowa | 846 | Conroy |
| Genoa Bluff Post Office (historical) | Genoa Bluff Post Office (historical) | Iowa | 892 | Williamsburg NW |
| West Pilot Post Office (historical) | West Pilot Post Office (historical) | Iowa | 906 | Williamsburg |
| West Troy Post Office (historical) | West Troy Post Office (historical) | Iowa | 876 | Williamsburg |
| Boltonville Post Office (historical) | Boltonville Post Office (historical) | Iowa | 837 | Oxford |
| Carter Post Office (historical) | Carter Post Office (historical) | Iowa | 709 | North English |
| Parnell Post Office | Parnell Post Office | Iowa | 860 | North English |
| Armah Post Office (historical) | Armah Post Office (historical) | Iowa | 869 | Millersburg |
| Ambrose Post Office (historical) | Ambrose Post Office (historical) | Iowa | 856 | Millersburg |
| High Post Office (historical) | High Post Office (historical) | Iowa | 751 | Middle Amana |
| West Post Office | West Post Office | Iowa | 781 | Middle Amana |
| Koszta Post Office (historical) | Koszta Post Office (historical) | Iowa | 758 | Ladora |
| Dayton Post Office (historical) | Dayton Post Office (historical) | Iowa | 774 | Ladora |
| Foote Post Office (historical) | Foote Post Office (historical) | Iowa | 692 | Holbrook |
| Green Center Post Office (historical) | Green Center Post Office (historical) | Iowa | 791 | Holbrook |
| Ione Post Office (historical) | Ione Post Office (historical) | Iowa | 804 | Holbrook |
| Lytle City Post Office (historical) | Lytle City Post Office (historical) | Iowa | 814 | Holbrook |
| Holbrook Post Office (historical) | Holbrook Post Office (historical) | Iowa | 810 | Holbrook |
| Moriah Post Office (historical) | Moriah Post Office (historical) | Iowa | 902 | Hartwick |
| Riverdale Post Office (historical) | Riverdale Post Office (historical) | Iowa | 771 | Hartwick |
| Hedge Post Office (historical) | Hedge Post Office (historical) | Iowa | 886 | Deep River |
| York Center Post Office (historical) | York Center Post Office (historical) | Iowa | 823 | Conroy |
| Rest Post Office (historical) | Rest Post Office (historical) | Iowa | Unknown | |
| Downard Post Office (historical) | Downard Post Office (historical) | Iowa | Unknown | |
| Cono Post Office (historical) | Cono Post Office (historical) | Iowa | Unknown | |
| North English Post Office | North English Post Office | Iowa | 837 | North English |
| Williamsburg Post Office | Williamsburg Post Office | Iowa | 820 | Williamsburg |
| Victor Post Office | Victor Post Office | Iowa | 804 | Victor |
| Millersburg Post Office | Millersburg Post Office | Iowa | 873 | Millersburg |
| Marengo Post Office | Marengo Post Office | Iowa | 738 | Marengo |
| Amana Post Office | Amana Post Office | Iowa | 735 | Middle Amana |
| Ladora Post Office | Ladora Post Office | Iowa | 781 | Ladora |
| Homestead Post Office | Homestead Post Office | Iowa | 869 | Amana |
| Conroy Post Office | Conroy Post Office | Iowa | 876 | Conroy |
| South Amana Post Office | South Amana Post Office | Iowa | 768 | Middle Amana |
| Middle Amana Post Office | Middle Amana Post Office | Iowa | 751 | Middle Amana |
| Barryville Post Office (historical) | Barryville Post Office (historical) | Delaware | 1060 | Masonville |
| Cold Water Post Office (historical) | Cold Water Post Office (historical) | Delaware | 1060 | Thorpe |
| Amarill Post Office (historical) | Amarill Post Office (historical) | Delaware | 1027 | Thorpe |
| Thorpe Post Office (historical) | Thorpe Post Office (historical) | Delaware | 1027 | Thorpe |
| Eads' Grove Post Office (historical) | Eads' Grove Post Office (historical) | Delaware | 1083 | Thorpe |
| Eads Post Office (historical) | Eads Post Office (historical) | Delaware | 997 | Thorpe |
| Broadway Post Office (historical) | Broadway Post Office (historical) | Delaware | 994 | Ryan |
| Abbeyville Post Office (historical) | Abbeyville Post Office (historical) | Delaware | 1043 | Ryan |
| Almira Post Office (historical) | Almira Post Office (historical) | Delaware | 981 | Ryan |
| Mangoldville Post Office (historical) | Mangoldville Post Office (historical) | Delaware | 1040 | Ryan |
| Hazlegreen Post Office (historical) | Hazlegreen Post Office (historical) | Delaware | 935 | Ryan |
| Grove Creek Post Office (historical) | Grove Creek Post Office (historical) | Delaware | 906 | Hopkinton West |
| Viola Post Office (historical) | Viola Post Office (historical) | Delaware | 787 | Colesburg |
| Poultney Post Office (historical) | Poultney Post Office (historical) | Delaware | 1063 | Petersburg |
| Petersburg Post Office (historical) | Petersburg Post Office (historical) | Delaware | 1112 | Petersburg |
| Coffin's Grove Post Office (historical) | Coffin's Grove Post Office (historical) | Delaware | 968 | Masonville |
| Bay Post Office (historical) | Bay Post Office (historical) | Delaware | 981 | Earlville |
| Spring Branch Post Office (historical) | Spring Branch Post Office (historical) | Delaware | 1020 | Manchester |
| Golden Post Office (historical) | Golden Post Office (historical) | Delaware | 1030 | Manchester |
| Bailey's Ford Post Office | Bailey's Ford Post Office | Delaware | 928 | Manchester |
| Milo Post Office (historical) | Milo Post Office (historical) | Delaware | 1030 | Manchester |
| Uniontown Post Office (historical) | Uniontown Post Office (historical) | Delaware | 1073 | Hopkinton West |
| Sand Springs Post Office (historical) | Sand Springs Post Office (historical) | Delaware | 922 | Hopkinton East |
| Mount Hope Post Office (historical) | Mount Hope Post Office (historical) | Delaware | 961 | Dundee |
| Almoral Station Post Office (historical) | Almoral Station Post Office (historical) | Delaware | 968 | Greeley |
| Almoral Post Office (historical) | Almoral Post Office (historical) | Delaware | 1030 | Greeley |
| Oneida Post Office (historical) | Oneida Post Office (historical) | Delaware | 1053 | Greeley |
| York Post Office (historical) | York Post Office (historical) | Delaware | 1109 | Edgewood |
| Green Hill Post Office (historical) | Green Hill Post Office (historical) | Delaware | 1053 | Earlville |
| Hartwick Post Office (historical) | Hartwick Post Office (historical) | Delaware | 938 | Earlville |
| Rockville Post Office (historical) | Rockville Post Office (historical) | Delaware | 925 | Dyersville West |
| Giltedge Post Office (historical) | Giltedge Post Office (historical) | Delaware | 925 | Dyersville West |
| Campton Post Office (historical) | Campton Post Office (historical) | Delaware | 1040 | Dundee |
| Forestville Post Office (historical) | Forestville Post Office (historical) | Delaware | 1017 | Dundee |
| Silvercreek Post Office (historical) | Silvercreek Post Office (historical) | Delaware | 994 | Coggon |
| Ehler Post Office (historical) | Ehler Post Office (historical) | Delaware | 978 | Coggon |
| Robinson Post Office (historical) | Robinson Post Office (historical) | Delaware | 938 | Coggon |
| Sand Creek Post Office (historical) | Sand Creek Post Office (historical) | Delaware | Unknown | |
| Plum Creek Post Office (historical) | Plum Creek Post Office (historical) | Delaware | Unknown | |
| Manchester Post Office | Manchester Post Office | Delaware | 942 | Manchester |
| Ryan Post Office | Ryan Post Office | Delaware | 1020 | Ryan |
| Masonville Post Office | Masonville Post Office | Delaware | 1020 | Masonville |
| Hopkinton Post Office | Hopkinton Post Office | Delaware | 860 | Hopkinton East |
| Greeley Post Office | Greeley Post Office | Delaware | 1152 | Greeley |
| Earlville Post Office | Earlville Post Office | Delaware | 994 | Earlville |
| Dundee Post Office | Dundee Post Office | Delaware | 1001 | Dundee |
| Delhi Post Office | Delhi Post Office | Delaware | 1027 | Earlville |
| Delaware Post Office | Delaware Post Office | Delaware | 1079 | Earlville |
| Colesburg Post Office | Colesburg Post Office | Delaware | 1155 | Colesburg |
| Winthrop Post Office | Winthrop Post Office | Buchanan | 1050 | Winthrop |
| Rowley Post Office | Rowley Post Office | Buchanan | 981 | Walker |
| Quasqueton Post Office | Quasqueton Post Office | Buchanan | 886 | Quasqueton |
| Crowfoot Post Office (historical) | Crowfoot Post Office (historical) | Buchanan | 1083 | Oelwein SE |
| Erin Post Office (historical) | Erin Post Office (historical) | Buchanan | 958 | Coggon |
| Kiene Post Office (historical) | Kiene Post Office (historical) | Buchanan | 1040 | Winthrop |
| Monti Post Office (historical) | Monti Post Office (historical) | Buchanan | 1007 | Winthrop |
| Middlefield Post Office (historical) | Middlefield Post Office (historical) | Buchanan | 1040 | Winthrop |
| Cana Post Office (historical) | Cana Post Office (historical) | Buchanan | 886 | Troy Mills |
| Atlanta Post Office (historical) | Atlanta Post Office (historical) | Buchanan | 902 | Troy Mills |
| Newtonville Post Office (historical) | Newtonville Post Office (historical) | Buchanan | 978 | Troy Mills |
| Gatesville Post Office (historical) | Gatesville Post Office (historical) | Buchanan | 968 | Quasqueton |
| Littleton Post Office (historical) | Littleton Post Office (historical) | Buchanan | 928 | Littleton |
| Kier Post Office (historical) | Kier Post Office (historical) | Buchanan | 1007 | Littleton |
| Shady Grove Post Office (historical) | Shady Grove Post Office (historical) | Buchanan | 925 | Jesup |
| Vista Post Office (historical) | Vista Post Office (historical) | Buchanan | 912 | Independence |
| Byrantburg Post Office (historical) | Byrantburg Post Office (historical) | Buchanan | 988 | Hazleton |
| Otterville Post Office (historical) | Otterville Post Office (historical) | Buchanan | 922 | Hazleton |
| Frink's Grove Post Office (historical) | Frink's Grove Post Office (historical) | Buchanan | 843 | Brandon |
| Hamerville Post Office (historical) | Hamerville Post Office (historical) | Buchanan | 915 | Cheney |
| Sunny Side Post Office (historical) | Sunny Side Post Office (historical) | Buchanan | 807 | Brandon |
| Independence Post Office | Independence Post Office | Buchanan | 912 | Independence |
| Jesup Post Office | Jesup Post Office | Buchanan | 978 | Jesup |
| Lamont Post Office | Lamont Post Office | Buchanan | 1043 | Lamont |
| Hazleton Post Office | Hazleton Post Office | Buchanan | 997 | Hazleton |
| Fairbank Post Office | Fairbank Post Office | Buchanan | 971 | Fairbank |
| Aurora Post Office | Aurora Post Office | Buchanan | 1138 | Lamont |
| Stanley Post Office (historical) | Stanley Post Office (historical) | Buchanan | 1112 | Stanley |
| Brandon Post Office | Brandon Post Office | Buchanan | 830 | Brandon |
| Summers Post Office (historical) | Summers Post Office (historical) | Benton | 883 | Center Point SW |
| Likins Post Office (historical) | Likins Post Office (historical) | Benton | 919 | Cheney |
| Unity Post Office (historical) | Unity Post Office (historical) | Benton | 925 | Center Point NW |
| Williams Post Office (historical) | Williams Post Office (historical) | Benton | 902 | Blairstown |
| Pickaway Post Office (historical) | Pickaway Post Office (historical) | Benton | 889 | Keystone South |
| Benton Centre Post Office (historical) | Benton Centre Post Office (historical) | Benton | 971 | Van Horne |
| Gomersal Post Office (historical) | Gomersal Post Office (historical) | Benton | 984 | Van Horne |
| Linwood Post Office (historical) | Linwood Post Office (historical) | Benton | 827 | Middle Amana |
| Taylor's Grove Post Office (historical) | Taylor's Grove Post Office (historical) | Benton | 873 | Marengo |
| Rogerville Post Office (historical) | Rogerville Post Office (historical) | Benton | 928 | Keystone North |
| Lelia Post Office (historical) | Lelia Post Office (historical) | Benton | 886 | Dysart |
| Woods Post Office (historical) | Woods Post Office (historical) | Benton | 965 | Garrison |
| Gillespie Post Office (historical) | Gillespie Post Office (historical) | Benton | 942 | Garrison |
| Daggett Post Office (historical) | Daggett Post Office (historical) | Benton | 863 | Garrison |
| Benton City Post Office (historical) | Benton City Post Office (historical) | Benton | 761 | Center Point NW |
| Vinton Post Office | Vinton Post Office | Benton | 794 | Vinton |
| Walford Post Office | Walford Post Office | Benton | 804 | Fairfax |
| Van Horne Post Office | Van Horne Post Office | Benton | 948 | Van Horne |
| Urbana Post Office | Urbana Post Office | Benton | 942 | Center Point |
| Shellsburg Post Office | Shellsburg Post Office | Benton | 787 | Shellsburg |
| Norway Post Office | Norway Post Office | Benton | 807 | Newhall |
| Newhall Post Office | Newhall Post Office | Benton | 886 | Newhall |
| Keystone Post Office | Keystone Post Office | Benton | 886 | Keystone South |
| Garrison Post Office | Garrison Post Office | Benton | 869 | Garrison |
| Blairstown Post Office | Blairstown Post Office | Benton | 837 | Blairstown |
| Belle Plaine Post Office | Belle Plaine Post Office | Benton | 843 | Belle Plaine |
| Atkins Post Office | Atkins Post Office | Benton | 860 | Fairfax |
| Watkins Post Office | Watkins Post Office | Benton | 830 | Newhall |
| Mouunt Auburn Post Office | Mouunt Auburn Post Office | Benton | 876 | Brandon |
| Luzerne Post Office (historical) | Luzerne Post Office (historical) | Benton | 896 | Keystone South |
| Newton Post Office | Newton Post Office | Jasper | 958 | Newton |
| Strawberry Hill Post Office (historical) | Strawberry Hill Post Office (historical) | Muscatine | 689 | Columbus Junction |
| Myrtle Post Office (historical) | Myrtle Post Office (historical) | Muscatine | 630 | Nichols |
| Geneva Post Office (historical) | Geneva Post Office (historical) | Muscatine | 558 | Illinois City |
| Summit Ridge Post Office (historical) | Summit Ridge Post Office (historical) | Muscatine | 718 | Wilton |
| Summit Post Office (historical) | Summit Post Office (historical) | Muscatine | 715 | Wilton |
| Moscow Post Office | Moscow Post Office | Muscatine | 653 | Wilton |
| Pleasant Prairie Post Office (historical) | Pleasant Prairie Post Office (historical) | Muscatine | 755 | Walcott |
| Lacey Post Office (historical) | Lacey Post Office (historical) | Muscatine | 600 | Nichols |
| Pike Post Office (historical) | Pike Post Office (historical) | Muscatine | 600 | Nichols |
| Cranston Post Office (historical) | Cranston Post Office (historical) | Muscatine | 666 | Nichols |
| Bayfield Post Office (historical) | Bayfield Post Office (historical) | Muscatine | 699 | Muscatine NW |
| Ardon Post Office (historical) | Ardon Post Office (historical) | Muscatine | 748 | Muscatine NW |
| Adams Post Office (historical) | Adams Post Office (historical) | Muscatine | 630 | Muscatine NW |
| Pine Mills Post Office (historical) | Pine Mills Post Office (historical) | Muscatine | 591 | Montpelier |
| Cedarville Post Office (historical) | Cedarville Post Office (historical) | Muscatine | 636 | Atalissa |
| Sweetland Post Office (historical) | Sweetland Post Office (historical) | Muscatine | 751 | Illinois City |
| Fairport Post Office (historical) | Fairport Post Office (historical) | Muscatine | 568 | Illinois City |
| Port Allen Post Office (historical) | Port Allen Post Office (historical) | Muscatine | 607 | Columbus Junction |
| Glen Dale Post Office (historical) | Glen Dale Post Office (historical) | Muscatine | Unknown | |
| Bower Landing Post Office (historical) | Bower Landing Post Office (historical) | Muscatine | Unknown | |
| Muscatine Post Office | Muscatine Post Office | Muscatine | 705 | Muscatine |
| Wilton Post Office | Wilton Post Office | Muscatine | 682 | Wilton |
| West Liberty Post Office | West Liberty Post Office | Muscatine | 686 | West Liberty |
| Stockton Post Office | Stockton Post Office | Muscatine | 722 | Walcott |
| Nichols Post Office | Nichols Post Office | Muscatine | 633 | Nichols |
| Montpelier Post Office (historical) | Montpelier Post Office (historical) | Muscatine | 568 | Montpelier |
| Fruitland Post Office | Fruitland Post Office | Muscatine | 548 | Letts |
| Conesville Post Office | Conesville Post Office | Muscatine | 617 | Nichols |
| Atalissa Post Office | Atalissa Post Office | Muscatine | 653 | Atalissa |
| Hermitage Post Office (historical) | Hermitage Post Office (historical) | Clinton | 702 | Wheatland |
| Spring Rock Post Office (historical) | Spring Rock Post Office (historical) | Clinton | 679 | Wheatland |
| Teeds Grove Post Office (historical) | Teeds Grove Post Office (historical) | Clinton | 692 | Savanna |
| Brown Post Office (historical) | Brown Post Office (historical) | Clinton | 702 | Preston |
| Malone Post Office (historical) | Malone Post Office (historical) | Clinton | 663 | Malone |
| Villanova Post Office (historical) | Villanova Post Office (historical) | Clinton | 781 | Goose Lake |
| Bliedorn Post Office (historical) | Bliedorn Post Office (historical) | Clinton | 774 | Elwood |
| Buenavista Post Office (historical) | Buenavista Post Office (historical) | Clinton | 646 | Donahue |
| Petersville Post Office (historical) | Petersville Post Office (historical) | Clinton | 755 | Delmar South |
| Riggs Post Office (historical) | Riggs Post Office (historical) | Clinton | 748 | Delmar North |
| Elk River Post Office (historical) | Elk River Post Office (historical) | Clinton | 594 | Clinton NW |
| Watkyns Glen Post Office (historical) | Watkyns Glen Post Office (historical) | Clinton | 663 | Clinton NW |
| Almont Post Office (historical) | Almont Post Office (historical) | Clinton | 656 | Clinton NW |
| Mead Post Office (historical) | Mead Post Office (historical) | Clinton | 587 | Clinton NW |
| Lyons Post Office (historical) | Lyons Post Office (historical) | Clinton | 650 | Clinton |
| Folletts Post Office (historical) | Folletts Post Office (historical) | Clinton | 607 | Camanche |
| Low Moor Post Office | Low Moor Post Office | Clinton | 646 | Camanche |
| Elvira Post Office (historical) | Elvira Post Office (historical) | Clinton | 722 | Camanche |
| Burgess Post Office (historical) | Burgess Post Office (historical) | Clinton | 797 | Baldwin |
| Waubesepinicon Post Office (historical) | Waubesepinicon Post Office (historical) | Clinton | Unknown | |
| Chancy Post Office | Chancy Post Office | Clinton | Unknown | |
| Bloomfield Post Office (historical) | Bloomfield Post Office (historical) | Clinton | Unknown | |
| White's Post Office (historical) | White's Post Office (historical) | Clinton | Unknown | |
| Van Horn Post Office (historical) | Van Horn Post Office (historical) | Clinton | Unknown | |
| Fair Haven Post Office (historical) | Fair Haven Post Office (historical) | Clinton | Unknown | |
| Clinton Post Office | Clinton Post Office | Clinton | 587 | Clinton |
| Wheatland Post Office | Wheatland Post Office | Clinton | 679 | Wheatland |
| Toronto Post Office | Toronto Post Office | Clinton | 722 | Lost Nation |
| Lost Nation Post Office | Lost Nation Post Office | Clinton | 761 | Lost Nation |
| Grand Mound Post Office | Grand Mound Post Office | Clinton | 712 | Grand Mound |
| Goose Lake Post Office | Goose Lake Post Office | Clinton | 692 | Goose Lake |
| Elwood Post Office | Elwood Post Office | Clinton | 738 | Elwood |
| Delmar Post Office | Delmar Post Office | Clinton | 820 | Delmar North |
| De Witt Post Office | De Witt Post Office | Clinton | 715 | De Witt |
| Charlotte Post Office | Charlotte Post Office | Clinton | 692 | Goose Lake |
| Camanche Post Office | Camanche Post Office | Clinton | 597 | Camanche |
| Calamus Post Office | Calamus Post Office | Clinton | 702 | Wheatland |
| Bryant Post Office | Bryant Post Office | Clinton | 801 | Andover |
| Andover Post Office | Andover Post Office | Clinton | 728 | Andover |
| Sullivan Post Office (historical) | Sullivan Post Office (historical) | Jackson | 955 | Zwingle |
| Higginsport Post Office (historical) | Higginsport Post Office (historical) | Jackson | 755 | Preston |
| Mount Algor Post Office (historical) | Mount Algor Post Office (historical) | Jackson | 879 | Miles |
| Sterling Post Office (historical) | Sterling Post Office (historical) | Jackson | 863 | Miles |
| Vanburen Post Office (historical) | Vanburen Post Office (historical) | Jackson | 682 | Miles |
| Bridgeport Post Office (historical) | Bridgeport Post Office (historical) | Jackson | 682 | Maquoketa |
| Hurstville Post Office (historical) | Hurstville Post Office (historical) | Jackson | 669 | Maquoketa |
| Hugo Post Office (historical) | Hugo Post Office (historical) | Jackson | 873 | Fillmore |
| Alma Post Office (historical) | Alma Post Office (historical) | Jackson | 978 | Leisure Lake |
| Iron Hills Post Office (historical) | Iron Hills Post Office (historical) | Jackson | 945 | Leisure Lake |
| Crabb's Mills Post Office (historical) | Crabb's Mills Post Office (historical) | Jackson | 715 | Leisure Lake |
| Crabb Post Office (historical) | Crabb Post Office (historical) | Jackson | 715 | Leisure Lake |
| Duggan Post Office (historical) | Duggan Post Office (historical) | Jackson | 958 | Leisure Lake |
| Emeline Post Office (historical) | Emeline Post Office (historical) | Jackson | 968 | Leisure Lake |
| Ozark Post Office (historical) | Ozark Post Office (historical) | Jackson | 879 | Leisure Lake |
| Tete De Mort Post Office (historical) | Tete De Mort Post Office (historical) | Jackson | 666 | La Motte |
| Prairie Springs Post Office (historical) | Prairie Springs Post Office (historical) | Jackson | 1056 | Dubuque South |
| Green Island Post Office | Green Island Post Office | Jackson | 617 | Green Island |
| Gordons Ferry Post Office (historical) | Gordons Ferry Post Office (historical) | Jackson | 594 | Galena |
| New Castle Post Office (historical) | New Castle Post Office (historical) | Jackson | 768 | Fulton |
| Ottercreek Post Office (historical) | Ottercreek Post Office (historical) | Jackson | 1020 | Fulton |
| Fulton Post Office (historical) | Fulton Post Office (historical) | Jackson | 709 | Fulton |
| Union Center Post Office (historical) | Union Center Post Office (historical) | Jackson | 883 | Delmar North |
| Canton Post Office (historical) | Canton Post Office (historical) | Jackson | 751 | Canton |
| Garry Owen Post Office (historical) | Garry Owen Post Office (historical) | Jackson | 1040 | Bernard |
| Smith's Ferry Post Office (historical) | Smith's Ferry Post Office (historical) | Jackson | 650 | Bellevue |
| Spruce Mills Post Office (historical) | Spruce Mills Post Office (historical) | Jackson | 627 | Bellevue |
| Waterford Post Office (historical) | Waterford Post Office (historical) | Jackson | 712 | Baldwin |
| Nashville Post Office (historical) | Nashville Post Office (historical) | Jackson | 718 | Baldwin |
| Hickory Grove Post Office (historical) | Hickory Grove Post Office (historical) | Jackson | 896 | Andrew |
| Cottonville Post Office (historical) | Cottonville Post Office (historical) | Jackson | 997 | Andrew |
| Rolley Post Office (historical) | Rolley Post Office (historical) | Jackson | Unknown | |
| Farmer's Creek Post Office (historical) | Farmer's Creek Post Office (historical) | Jackson | Unknown | |
| Deventersville Post Office (historical) | Deventersville Post Office (historical) | Jackson | Unknown | |
| Amoy Post Office (historical) | Amoy Post Office (historical) | Jackson | Unknown | |
| Maquoketa Post Office | Maquoketa Post Office | Jackson | 696 | Maquoketa |
| Bellevue Post Office | Bellevue Post Office | Jackson | 620 | Bellevue |
| Sabula Post Office | Sabula Post Office | Jackson | 597 | Savanna |
| Preston Post Office | Preston Post Office | Jackson | 659 | Preston |
| Miles Post Office | Miles Post Office | Jackson | 804 | Miles |
| Baldwin Post Office | Baldwin Post Office | Jackson | 725 | Baldwin |
| Andrew Post Office | Andrew Post Office | Jackson | 886 | Andrew |
| La Motte Post Office | La Motte Post Office | Jackson | 919 | La Motte |
| Monmouth Post Office | Monmouth Post Office | Jackson | 748 | Wyoming East |
| Saint Donatus Post Office | Saint Donatus Post Office | Jackson | 666 | La Motte |
| Spragueville Post Office | Spragueville Post Office | Jackson | 659 | Preston |
| Springbrook Post Office | Springbrook Post Office | Jackson | 856 | Springbrook |
| Asbury Post Office (historical) | Asbury Post Office (historical) | Dubuque | 932 | Sherrill |
| Cascade Post Office | Cascade Post Office | Dubuque | 817 | Cascade |
| Worthington Post Office | Worthington Post Office | Dubuque | 925 | Dyersville East |
| Sherrill POst Office | Sherrill POst Office | Dubuque | 984 | Sherrill |
| Peosta Post Office | Peosta Post Office | Dubuque | 1056 | Peosta |
| New Vienna Post Office | New Vienna Post Office | Dubuque | 1007 | New Vienna |
| Luxwmburg Post Office | Luxwmburg Post Office | Dubuque | 1168 | New Vienna |
| Farley Post Office | Farley Post Office | Dubuque | 1115 | Dyersville East |
| Epworth Post Office | Epworth Post Office | Dubuque | 1047 | Epworth |
| Durango Post Office (historical) | Durango Post Office (historical) | Dubuque | 646 | Sherrill |
| Holy Cross Post Office (historical) | Holy Cross Post Office (historical) | Dubuque | 1220 | Holy Cross |
| Dyersville Post Office | Dyersville Post Office | Dubuque | 955 | Dyersville East |
| Bernard Post Office | Bernard Post Office | Dubuque | 919 | Bernard |
| Channingville Post Office (historical) | Channingville Post Office (historical) | Dubuque | 820 | Epworth |
| Lattner Post Office (historical) | Lattner Post Office (historical) | Dubuque | 843 | Epworth |
| Preston Post Office (historical) | Preston Post Office (historical) | Dubuque | 981 | Dyersville East |
| Zwingle Post Office | Zwingle Post Office | Dubuque | 892 | Zwingle |
| Emna Post Office (historical) | Emna Post Office (historical) | Dubuque | 1053 | Zwingle |
| Duke Post Office (historical) | Duke Post Office (historical) | Dubuque | 1066 | Zwingle |
| Bennettville Post Office (historical) | Bennettville Post Office (historical) | Dubuque | 1056 | Zwingle |
| Lore Post Office (historical) | Lore Post Office (historical) | Dubuque | 1063 | Sherrill |
| Spechts Ferry Post Office (historical) | Spechts Ferry Post Office (historical) | Dubuque | 604 | Potosi |
| Julien Post Office (historical) | Julien Post Office (historical) | Dubuque | 902 | Peosta |
| Julian Post Office (historical) | Julian Post Office (historical) | Dubuque | 889 | Peosta |
| Centralia Post Office (historical) | Centralia Post Office (historical) | Dubuque | 1135 | Peosta |
| Graf Post Office (historical) | Graf Post Office (historical) | Dubuque | 781 | Peosta |
| Derrinane Post Office (historical) | Derrinane Post Office (historical) | Dubuque | 1024 | Peosta |
| McCants Post Office (historical) | McCants Post Office (historical) | Dubuque | 1142 | Peosta |
| Glassnevin Post Office (historical) | Glassnevin Post Office (historical) | Dubuque | 1093 | New Vienna |
| Oakland Post Office (historical) | Oakland Post Office (historical) | Dubuque | 1115 | New Vienna |
| King Post Office (historical) | King Post Office (historical) | Dubuque | 1106 | Menominee |
| O'Neill Post Office (historical) | O'Neill Post Office (historical) | Dubuque | 860 | Holy Cross |
| Rickardsville Post Office (historical) | Rickardsville Post Office (historical) | Dubuque | 1030 | Holy Cross |
| Tivoli Post Office (historical) | Tivoli Post Office (historical) | Dubuque | 1194 | Holy Cross |
| Cottage Hill Post Office (historical) | Cottage Hill Post Office (historical) | Dubuque | 1142 | Holy Cross |
| Bankston Post Office (historical) | Bankston Post Office (historical) | Dubuque | 1207 | Holy Cross |
| Hazel Post Office (historical) | Hazel Post Office (historical) | Dubuque | 919 | Cascade |
| Fillmore Post Office (historical) | Fillmore Post Office (historical) | Dubuque | 833 | Fillmore |
| Placid Post Office (historical) | Placid Post Office (historical) | Dubuque | 961 | Epworth |
| Arquitt Post Office (historical) | Arquitt Post Office (historical) | Dubuque | 1115 | Dyersville East |
| Rockdale Post Office (historical) | Rockdale Post Office (historical) | Dubuque | 702 | Dubuque South |
| Keywest Post Office (historical) | Keywest Post Office (historical) | Dubuque | 820 | Dubuque South |
| Center Grove Post Office (historical) | Center Grove Post Office (historical) | Dubuque | 787 | Dubuque South |
| Buncombe Post Office (historical) | Buncombe Post Office (historical) | Dubuque | 1053 | Zwingle |
| Ballyclough Post Office (historical) | Ballyclough Post Office (historical) | Dubuque | 1066 | Dubuque South |
| Dubuque Post Office | Dubuque Post Office | Dubuque | 640 | Dubuque South |
| River Side Post Office (historical) | River Side Post Office (historical) | Dubuque | 630 | Dubuque North |
| Peru Post Office (historical) | Peru Post Office (historical) | Dubuque | 614 | Dubuque North |
| Sageville Post Office (historical) | Sageville Post Office (historical) | Dubuque | 666 | Dubuque North |
| Donelan POst Office (historical) | Donelan POst Office (historical) | Dubuque | 965 | Bernard |
| Aspinwall Post Office (historical) | Aspinwall Post Office (historical) | Dubuque | 1089 | Balltown |
| Washington Mills Post Office (historical) | Washington Mills Post Office (historical) | Dubuque | 817 | Bernard |
| Prairie Creek Post Office (historical) | Prairie Creek Post Office (historical) | Dubuque | 935 | Bernard |
| Melleray Post Office (historical) | Melleray Post Office (historical) | Dubuque | 928 | Bernard |
| Balltown Post Office (historical) | Balltown Post Office (historical) | Dubuque | 1201 | Balltown |
| Weld's Landing Post Office (historical) | Weld's Landing Post Office (historical) | Dubuque | Unknown | |
| Sylva Post Office (historical) | Sylva Post Office (historical) | Dubuque | Unknown | |
| Tara Post Office (historical) | Tara Post Office (historical) | Dubuque | Unknown | |
| Saint Josephs Prairie Post Office (historical) | Saint Josephs Prairie Post Office (historical) | Dubuque | Unknown | |
| Olympus Post Office (historical) | Olympus Post Office (historical) | Dubuque | Unknown | |
| Mosalem Post Office (historical) | Mosalem Post Office (historical) | Dubuque | Unknown | |
| Millard Post Office (historical) | Millard Post Office (historical) | Dubuque | Unknown | |
| Morena Post Office (historical) | Morena Post Office (historical) | Dubuque | Unknown | |
| Lapage Post Office (historical) | Lapage Post Office (historical) | Dubuque | Unknown | |
| Glen Post Office (historical) | Glen Post Office (historical) | Dubuque | Unknown | |
| Center Post Office (historical) | Center Post Office (historical) | Dubuque | Unknown | |
| Salisbury Post Office (historical) | Salisbury Post Office (historical) | Dubuque | Unknown | |
| Scotch Grove Post Office (historical) | Scotch Grove Post Office (historical) | Jones | 869 | Scotch Grove |
| Yankee Grove Post Office (historical) | Yankee Grove Post Office (historical) | Cedar | 771 | Mechanicsville |
| Cessford Post Office (historical) | Cessford Post Office (historical) | Cedar | 823 | Tipton East |
| Sugar Creek Post Office (historical) | Sugar Creek Post Office (historical) | Cedar | 669 | Wilton |
| Downey Post Office (historical) | Downey Post Office (historical) | Cedar | 689 | West Liberty |
| Springdale Post Office (historical) | Springdale Post Office (historical) | Cedar | 781 | West Branch |
| Plato Post Office (historical) | Plato Post Office (historical) | Cedar | 709 | West Branch |
| Centerdale Post Office (historical) | Centerdale Post Office (historical) | Cedar | 722 | West Branch |
| Buchanan Post Office (historical) | Buchanan Post Office (historical) | Cedar | 761 | Tipton West |
| Wald Post Office (historical) | Wald Post Office (historical) | Cedar | 827 | Tipton West |
| York Prairie Post Office (historical) | York Prairie Post Office (historical) | Cedar | 791 | Tipton East |
| Woodbridge Post Office (historical) | Woodbridge Post Office (historical) | Cedar | 768 | Tipton East |
| Apollo Post Office (historical) | Apollo Post Office (historical) | Cedar | 801 | Lime City |
| Rochester Post Office (historical) | Rochester Post Office (historical) | Cedar | 663 | Rochester |
| Pedee POst Office (historical) | Pedee POst Office (historical) | Cedar | 771 | Rochester |
| Cedar Valley Post Office (historical) | Cedar Valley Post Office (historical) | Cedar | 791 | Rochester |
| Side Hill Post Office (historical) | Side Hill Post Office (historical) | Cedar | 801 | Cedar Bluff |
| Zoar Post Office (historical) | Zoar Post Office (historical) | Cedar | 764 | West Branch |
| Lithgow Post Office (historical) | Lithgow Post Office (historical) | Cedar | 810 | Lowden |
| Inland Post Office (historical) | Inland Post Office (historical) | Cedar | 735 | Lowden |
| Harwell Post Office (historical) | Harwell Post Office (historical) | Cedar | 814 | Lowden |
| Rosette Post Office (historical) | Rosette Post Office (historical) | Cedar | 837 | Lowden |
| Lactin Post Office (historical) | Lactin Post Office (historical) | Cedar | 761 | Lime City |
| Lime City Post Office (historical) | Lime City Post Office (historical) | Cedar | 778 | Lime City |
| Cedar Post Office (historical) | Cedar Post Office (historical) | Cedar | 781 | Clarence |
| Gower's Ferry Post Office (historical) | Gower's Ferry Post Office (historical) | Cedar | 663 | Cedar Bluff |
| Cedar Bluff Post Office (historical) | Cedar Bluff Post Office (historical) | Cedar | 709 | Cedar Bluff |
| Sunbury Post Office (historical) | Sunbury Post Office (historical) | Cedar | 774 | Bennett |
| Brick House Post Office (historical) | Brick House Post Office (historical) | Cedar | 761 | Atalissa |
| Honey Grove Post Office (historical) | Honey Grove Post Office (historical) | Cedar | Unknown | |
| Tipton Post Office | Tipton Post Office | Cedar | 820 | Tipton West |
| West Branch Post Office | West Branch Post Office | Cedar | 718 | West Branch |
| Stanwood Post Office | Stanwood Post Office | Cedar | 846 | Stanwood |
| Mechanicsville Post Office | Mechanicsville Post Office | Cedar | 892 | Mechanicsville |
| Durant Post Office | Durant Post Office | Cedar | 715 | Durant |
| Lowden Post Office | Lowden Post Office | Cedar | 725 | Lowden |
| Clarence Post Office | Clarence Post Office | Cedar | 850 | Clarence |
| Bennett Post Office | Bennett Post Office | Cedar | 764 | Bennett |
| Massillon Post Office (historical) | Massillon Post Office (historical) | Cedar | 732 | Oxford Junction |
| Welton Post Office | Welton Post Office | Clinton | 699 | Delmar South |
| Monticello Post Office | Monticello Post Office | Jones | 833 | Monticello |
| Anamosa Post Office | Anamosa Post Office | Jones | 840 | Anamosa |
| Madison Post Office (historical) | Madison Post Office (historical) | Jones | 906 | Wyoming West |
| Hale Post Office (historical) | Hale Post Office (historical) | Jones | 794 | Wyoming West |
| Pierce Post Office (historical) | Pierce Post Office (historical) | Jones | 915 | Wyoming East |
| Fuller's Mills Post Office (historical) | Fuller's Mills Post Office (historical) | Jones | 814 | Scotch Grove |
| Johnson Post Office (historical) | Johnson Post Office (historical) | Jones | 860 | Scotch Grove |
| Oxford Mills Post Office (historical) | Oxford Mills Post Office (historical) | Jones | 735 | Oxford Junction |
| Isabell Post Office (historical) | Isabell Post Office (historical) | Jones | 889 | Morley |
| Langworthy Post Office (historical) | Langworthy Post Office (historical) | Jones | 860 | Monticello |
| Amber Post Office (historical) | Amber Post Office (historical) | Jones | 1027 | Monticello |
| Edinburgh Post Office (historical) | Edinburgh Post Office (historical) | Jones | 1040 | Monticello |
| Clay Mills Post Office (historical) | Clay Mills Post Office (historical) | Jones | 725 | Canton |
| Downersville Post Office (historical) | Downersville Post Office (historical) | Jones | 961 | Hopkinton West |
| Argand Post Office (historical) | Argand Post Office (historical) | Jones | 961 | Hopkinton West |
| Bowen Post Office (historical) | Bowen Post Office (historical) | Jones | 981 | Cascade |
| Zurich Post Office (historical) | Zurich Post Office (historical) | Jones | 978 | Cascade |
| Highland Grove Post Office (historical) | Highland Grove Post Office (historical) | Jones | 948 | Anamosa |
| Big Woods Post Office (historical) | Big Woods Post Office (historical) | Jones | 938 | Anamosa |
| Duane Post Office (historical) | Duane Post Office (historical) | Jones | 1056 | Anamosa NE |
| Cass Centre Post Office (historical) | Cass Centre Post Office (historical) | Jones | 896 | Anamosa NE |
| Cass Post Office (historical) | Cass Post Office (historical) | Jones | 955 | Anamosa NE |
| Fairview Post Office (historical) | Fairview Post Office (historical) | Jones | 981 | Anamosa |
| Stone City Post Office (historical) | Stone City Post Office (historical) | Jones | 814 | Anamosa |
| Wyoming Post Office | Wyoming Post Office | Jones | 817 | Wyoming West |
| Oxford Junction Post Office | Oxford Junction Post Office | Jones | 725 | Oxford Junction |
| Condit Post Office (historical) | Condit Post Office (historical) | Jones | 896 | Anamosa NE |
| Olin Post Office | Olin Post Office | Jones | 758 | Stanwood |
| Martelle Post Office | Martelle Post Office | Jones | 906 | Anamosa |
| Onslow Post Office | Onslow Post Office | Jones | 919 | Wyoming West |
| Center Junction Post Office | Center Junction Post Office | Jones | 906 | Wyoming West |
| Morley Post Office | Morley Post Office | Jones | 797 | Morley |
| Elk Run Post Office (historical) | Elk Run Post Office (historical) | Black Hawk | 837 | Waterloo South |
| Calvin Post Office (historical) | Calvin Post Office (historical) | Black Hawk | 948 | Waterloo South |
| Edwards Post Office (historical) | Edwards Post Office (historical) | Black Hawk | 922 | Waterloo North |
| Crain Creek Post Office (historical) | Crain Creek Post Office (historical) | Black Hawk | 971 | Denver |
| Winslow Post Office (historical) | Winslow Post Office (historical) | Black Hawk | 948 | Shell Rock |
| Finchford Post Office (historical) | Finchford Post Office (historical) | Black Hawk | 886 | Shell Rock |
| Hicks Post Office (historical) | Hicks Post Office (historical) | Black Hawk | 906 | Reinbeck |
| Gresham Post Office (historical) | Gresham Post Office (historical) | Black Hawk | 1010 | Readlyn |
| Benson Post Office (historical) | Benson Post Office (historical) | Black Hawk | 906 | New Hartford |
| Barclay Post Office (historical) | Barclay Post Office (historical) | Black Hawk | 951 | Littleton |
| Eliza Post Office (historical) | Eliza Post Office (historical) | Black Hawk | 823 | La Porte City |
| Jubilee Post Office (historical) | Jubilee Post Office (historical) | Black Hawk | 889 | Jesup |
| Energy Post Office (historical) | Energy Post Office (historical) | Black Hawk | 850 | Jesup |
| Filkins Grove Post Office (historical) | Filkins Grove Post Office (historical) | Black Hawk | 879 | Hudson |
| Louise Post Office (historical) | Louise Post Office (historical) | Black Hawk | 906 | Eagle Center |
| Eagle Center Post Office (historical) | Eagle Center Post Office (historical) | Black Hawk | 955 | Eagle Center |
| Canfield Post Office (historical) | Canfield Post Office (historical) | Black Hawk | 984 | Dunkerton |
| Mount Hope Post Office (historical) | Mount Hope Post Office (historical) | Black Hawk | 846 | Cedar Falls |
| Boies Post Office (historical) | Boies Post Office (historical) | Black Hawk | 935 | Cedar Falls |
| Voorhies Post Office (historical) | Voorhies Post Office (historical) | Black Hawk | 1001 | Buckingham |
| Blessing Post Office (historical) | Blessing Post Office (historical) | Black Hawk | 997 | Buckingham |
| Stella Post Office (historical) | Stella Post Office (historical) | Black Hawk | Unknown | |
| East Waterloo Post Office (historical) | East Waterloo Post Office (historical) | Black Hawk | Unknown | |
| Waterloo Post Office | Waterloo Post Office | Black Hawk | 846 | Waterloo South |
| Ives Post Office (historical) | Ives Post Office (historical) | Johnson | 745 | Iowa City East |
| Belle Air Post Office (historical) | Belle Air Post Office (historical) | Johnson | 745 | Frytown |
| Frank Pierce Post Office (historical) | Frank Pierce Post Office (historical) | Johnson | 804 | Frytown |
| Sharon Center Post Office (historical) | Sharon Center Post Office (historical) | Johnson | 758 | Frytown |
| Cosgrove Post Office (historical) | Cosgrove Post Office (historical) | Johnson | 804 | Tiffin |
| Copi Post Office (historical) | Copi Post Office (historical) | Johnson | 774 | Tiffin |
| Curtis Post Office (historical) | Curtis Post Office (historical) | Johnson | 715 | Swisher |
| Cou Falls Post Office (historical) | Cou Falls Post Office (historical) | Johnson | 732 | Swisher |
| Chase Post Office (historical) | Chase Post Office (historical) | Johnson | 715 | Swisher |
| River Junction Post Office (historical) | River Junction Post Office (historical) | Johnson | 650 | Lone Tree |
| Palestine Post Office (historical) | Palestine Post Office (historical) | Johnson | 640 | Lone Tree |
| Oakdale Post Office | Oakdale Post Office | Johnson | 814 | Iowa City West |
| Morse Post Office (historical) | Morse Post Office (historical) | Johnson | 768 | Iowa City East |
| Dodd Post Office (historical) | Dodd Post Office (historical) | Johnson | 833 | Iowa City East |
| Newport Centre Post Office (historical) | Newport Centre Post Office (historical) | Johnson | 843 | Iowa City East |
| Newport Post Office (historical) | Newport Post Office (historical) | Johnson | 843 | Iowa City East |
| Carthage Post Office (historical) | Carthage Post Office (historical) | Johnson | 682 | Iowa City East |
| Oasis Post Office (historical) | Oasis Post Office (historical) | Johnson | 801 | Iowa City East |
| Frendale Post Office (historical) | Frendale Post Office (historical) | Johnson | 735 | Amish |
| Windham Post Office (historical) | Windham Post Office (historical) | Johnson | 712 | Amish |
| Amish Post Office (historical) | Amish Post Office (historical) | Johnson | 755 | Amish |
| Malvern Post Office (historical) | Malvern Post Office (historical) | Johnson | Unknown | |
| Leona Post Office (historical) | Leona Post Office (historical) | Johnson | Unknown | |
| Tiffin Post Office | Tiffin Post Office | Johnson | 718 | Tiffin |
| Iowa City Post Office | Iowa City Post Office | Johnson | 692 | Iowa City West |
| Coralville Post Office | Coralville Post Office | Johnson | 682 | Iowa City West |
| North Liberty Post Office | North Liberty Post Office | Johnson | 781 | Iowa City West |
| Oxford Post Office | Oxford Post Office | Johnson | 745 | Oxford |
| Lone Tree Post Office | Lone Tree Post Office | Johnson | 725 | Lone Tree |
| Solon Post Office | Solon Post Office | Johnson | 797 | Solon |
| Swisher Post Office | Swisher Post Office | Johnson | 791 | Swisher |
| Shueyville Post Office (historical) | Shueyville Post Office (historical) | Johnson | 850 | Swisher |
| Cedar Falls Post Office | Cedar Falls Post Office | Black Hawk | 876 | Cedar Falls |
| La Porte City Post Office | La Porte City Post Office | Black Hawk | 820 | La Porte City |
| Dunkerton Post Office | Dunkerton Post Office | Black Hawk | 955 | Dunkerton |
| Washburn Post Office (historical) | Washburn Post Office (historical) | Black Hawk | 833 | Waterloo South |
| Hudson Post Office | Hudson Post Office | Black Hawk | 899 | Hudson |
| Raymond Post Office | Raymond Post Office | Black Hawk | 899 | Gilbertville |
| Gilbertville Post Office | Gilbertville Post Office | Black Hawk | 853 | Gilbertville |
| Evansdale Branch Post Office | Evansdale Branch Post Office | Black Hawk | 840 | Waterloo South |
| Dewar Post Office | Dewar Post Office | Black Hawk | 889 | Dunkerton |
| Big Rock Post Office (historical) | Big Rock Post Office (historical) | Scott | 682 | Wheatland |
| Pleasant Valley Post Office | Pleasant Valley Post Office | Scott | 600 | Silvis |
| Point Pleasant Post Office (historical) | Point Pleasant Post Office (historical) | Scott | 623 | Grand Mound |
| Cadda Post Office (historical) | Cadda Post Office (historical) | Scott | 640 | Grand Mound |
| Kerr Post Office (historical) | Kerr Post Office (historical) | Scott | 735 | McCausland |
| Argo Post Office (historical) | Argo Post Office (historical) | Scott | 768 | McCausland |
| Barrwood Post Office (historical) | Barrwood Post Office (historical) | Scott | 669 | Eldridge |
| Hickory Grove Post Office (historical) | Hickory Grove Post Office (historical) | Scott | 748 | Donahue |
| Noel Post Office (historical) | Noel Post Office (historical) | Scott | 630 | De Witt |
| Gambril Post Office (historical) | Gambril Post Office (historical) | Scott | 623 | De Witt |
| New Hamburgh Post Office (historical) | New Hamburgh Post Office (historical) | Scott | 725 | Dixon |
| Husam Post Office (historical) | Husam Post Office (historical) | Scott | 702 | Davenport West |
| Greentree Post Office (historical) | Greentree Post Office (historical) | Scott | 741 | Davenport East |
| Gilbert Post Office (historical) | Gilbert Post Office (historical) | Scott | 568 | Davenport East |
| Balluff Post Office (historical) | Balluff Post Office (historical) | Scott | 656 | Davenport East |
| Rockingham Post Office (historical) | Rockingham Post Office (historical) | Scott | 551 | Andalusia |
| White Sulphur Post Office (historical) | White Sulphur Post Office (historical) | Scott | 571 | Andalusia |
| Jamestown Post Office (historical) | Jamestown Post Office (historical) | Scott | 751 | Andalusia |
| Price Post Office (historical) | Price Post Office (historical) | Scott | Unknown | |
| Linn Grove Post Office (historical) | Linn Grove Post Office (historical) | Scott | Unknown | |
| Le Claire Centre Post Office (historical) | Le Claire Centre Post Office (historical) | Scott | Unknown | |
| Churchville Post Office (historical) | Churchville Post Office (historical) | Scott | Unknown | |
| Farming Grove Post Office (historical) | Farming Grove Post Office (historical) | Scott | Unknown | |
| Davenport Post Office | Davenport Post Office | Scott | 561 | Davenport East |
| Bettendorf Post Office | Bettendorf Post Office | Scott | 584 | Davenport East |
| Walcott Post Office | Walcott Post Office | Scott | 738 | Walcott |
| Princeton Post Office | Princeton Post Office | Scott | 600 | Cordova |
| New Liberty Post Office | New Liberty Post Office | Scott | 801 | Bennett |
| McCausland Post Office | McCausland Post Office | Scott | 610 | McCausland |
| Long Grove Post Office | Long Grove Post Office | Scott | 791 | Eldridge |
| Le Claire Post Office | Le Claire Post Office | Scott | 630 | Port Byron |
| Eldridge Post Office | Eldridge Post Office | Scott | 797 | Eldridge |
| Donahue Post Office | Donahue Post Office | Scott | 705 | Donahue |
| Dixon Post Office | Dixon Post Office | Scott | 676 | Dixon |
| Buffalo Post Office | Buffalo Post Office | Scott | 558 | Andalusia |
| Blue Grass Post Office | Blue Grass Post Office | Scott | 791 | Walcott |
| Oak Grove Post Office (historical) | Oak Grove Post Office (historical) | Linn | 827 | Shellsburg |
| Spring Grove Post Office (historical) | Spring Grove Post Office (historical) | Linn | 981 | Coggon |
| Prospect Hill Post Office (historical) | Prospect Hill Post Office (historical) | Linn | 935 | Anamosa |
| Troy Mills Post Office | Troy Mills Post Office | Linn | 873 | Troy Mills |
| Whittier Post Office (historical) | Whittier Post Office (historical) | Linn | 915 | Springville |
| Viola Post Office | Viola Post Office | Linn | 883 | Springville |
| Paralta Post Office (historical) | Paralta Post Office (historical) | Linn | 843 | Springville |
| Crabapple Post Office (historical) | Crabapple Post Office (historical) | Linn | 873 | Springville |
| Covington Post Office (historical) | Covington Post Office (historical) | Linn | 784 | Shellsburg |
| Boulder Post Office (historical) | Boulder Post Office (historical) | Linn | 951 | Hopkinton West |
| Cousins Post Office (historical) | Cousins Post Office (historical) | Linn | 932 | Prairieburg |
| Waubeek Post Office (historical) | Waubeek Post Office (historical) | Linn | 837 | Prairieburg |
| Necot Post Office (historical) | Necot Post Office (historical) | Linn | 906 | Prairieburg |
| Ivanhoe POst Office (historical) | Ivanhoe POst Office (historical) | Linn | 699 | Mount Vernon |
| Saint Julian Post Office (historical) | Saint Julian Post Office (historical) | Linn | 804 | Mount Vernon |
| Saint Mary's Post Office (historical) | Saint Mary's Post Office (historical) | Linn | 748 | Mount Vernon |
| Rural Post Office (historical) | Rural Post Office (historical) | Linn | 896 | Marion |
| Alice Post Office (historical) | Alice Post Office (historical) | Linn | 866 | Lafayette |
| Sisley's Grove Post Office (historical) | Sisley's Grove Post Office (historical) | Linn | 791 | Fairfax |
| Western College Post Office (historical) | Western College Post Office (historical) | Linn | 814 | Swisher |
| Hoosier Grove Post Office (historical) | Hoosier Grove Post Office (historical) | Linn | 758 | Ely |
| Banner Valley Post Office (historical) | Banner Valley Post Office (historical) | Linn | 758 | Ely |
| Valley Farm Post Office (historical) | Valley Farm Post Office (historical) | Linn | 853 | Coggon |
| Elmont Post Office (historical) | Elmont Post Office (historical) | Linn | 892 | Central City |
| Wapsa Post Office (historical) | Wapsa Post Office (historical) | Linn | 814 | Central City |
| Torah Post Office (historical) | Torah Post Office (historical) | Linn | 948 | Central City |
| Paris Post Office (historical) | Paris Post Office (historical) | Linn | 850 | Central City |
| Rogers Post Office (historical) | Rogers Post Office (historical) | Linn | 928 | Central City |
| Kingston City Post Office (historical) | Kingston City Post Office (historical) | Linn | 725 | Cedar Rapids South |
| Linn Junction Post Office (historical) | Linn Junction Post Office (historical) | Linn | 751 | Cedar Rapids North |
| Louisa Post Office (historical) | Louisa Post Office (historical) | Linn | 820 | Cedar Rapids North |
| Kenwood Park Post Office (historical) | Kenwood Park Post Office (historical) | Linn | 791 | Cedar Rapids North |
| Dry Creek Post Office (historical) | Dry Creek Post Office (historical) | Linn | 866 | Marion |
| Shady Brook Post Office (historical) | Shady Brook Post Office (historical) | Linn | Unknown | |
| Palisades Post Office (historical) | Palisades Post Office (historical) | Linn | Unknown | |
| Mondieu Post Office (historical) | Mondieu Post Office (historical) | Linn | Unknown | |
| Babcock Post Office (historical) | Babcock Post Office (historical) | Linn | Unknown | |
| Cedar Rapids Post Office | Cedar Rapids Post Office | Linn | 732 | Cedar Rapids South |
| Marion Post Office | Marion Post Office | Linn | 840 | Marion |
| Walker Post Office | Walker Post Office | Linn | 896 | Walker |
| Idlewild Post Office (historical) | Idlewild Post Office (historical) | Buchanan | 945 | Jesup |
| Gregg Post Office (historical) | Gregg Post Office (historical) | Johnson | 843 | Swisher |
| Sheridan Post Office (historical) | Sheridan Post Office (historical) | Poweshiek | 984 | Sheridan |
| Hills Post Office | Hills Post Office | Johnson | Unknown | |
| Bon Accord Post Office (historical) | Bon Accord Post Office (historical) | Johnson | 705 | Hills |
| Seventy Eight Post Office (historical) | Seventy Eight Post Office (historical) | Johnson | 669 | Hills |
| Mofordsville Post Office (historical) | Mofordsville Post Office (historical) | Johnson | 633 | Hills |
| Campbell Post Office (historical) | Campbell Post Office (historical) | Polk | 899 | Commerce |
| Commerce Post Office (historical) | Commerce Post Office (historical) | Polk | 889 | Commerce |
| Harvey's Point Post Office (historical) | Harvey's Point Post Office (historical) | Polk | 886 | Des Moines SE |
| Cope Post Office (historical) | Cope Post Office (historical) | Polk | 827 | Altoona |
| Nobleton Post Office (historical) | Nobleton Post Office (historical) | Polk | 971 | Mitchellville |
| Walnut Creek Post Office (historical) | Walnut Creek Post Office (historical) | Polk | Unknown | |
| Green Bush Post Office (historical) | Green Bush Post Office (historical) | Polk | Unknown | |
| Coal Hill Post Office (historical) | Coal Hill Post Office (historical) | Polk | Unknown | |
| Enterprise Post Office (historical) | Enterprise Post Office (historical) | Polk | 1004 | Des Moines NE |
| Greenwood Post Office (historical) | Greenwood Post Office (historical) | Polk | 886 | Des Moines NE |
| Marquisville Post Office (historical) | Marquisville Post Office (historical) | Polk | 932 | Des Moines NE |
| Norwoodville Post Office (historical) | Norwoodville Post Office (historical) | Polk | 919 | Des Moines NE |
| Delaware Post Office (historical) | Delaware Post Office (historical) | Polk | 951 | Des Moines NE |
| Trent Post Office (historical) | Trent Post Office (historical) | Polk | 932 | Des Moines NE |
| Ashawa Post Office (historical) | Ashawa Post Office (historical) | Polk | 883 | Commerce |
| Urbandale Post Office | Urbandale Post Office | Polk | 899 | Des Moines NW |
| Runnells Post Office | Runnells Post Office | Polk | 807 | Runnells |
| Polk City Post Office | Polk City Post Office | Polk | 886 | Polk City |
| Mitchellville Post Office | Mitchellville Post Office | Polk | 974 | Mitchellville |
| Johnston Post Office | Johnston Post Office | Polk | 830 | Des Moines NW |
| Grimes Post Office | Grimes Post Office | Polk | 958 | Grimes |
| Elkhart Post Office | Elkhart Post Office | Polk | 974 | Elkhart |
| Berwick Post Office | Berwick Post Office | Polk | 850 | Des Moines NE |
| Ankeny Post Office | Ankeny Post Office | Polk | 955 | Des Moines NE |
| Altoona Post Office | Altoona Post Office | Polk | 958 | Altoona |
| Bondurant Post Office | Bondurant Post Office | Polk | 968 | Altoona |
| Chesterfield Post Office (historical) | Chesterfield Post Office (historical) | Polk | 784 | Des Moines SE |
| Marybell Post Office (historical) | Marybell Post Office (historical) | Polk | 879 | Runnells |
| Carleton Post Office (historical) | Carleton Post Office (historical) | Polk | 860 | Rising Sun |
| Camp Post Office (historical) | Camp Post Office (historical) | Polk | 886 | Rising Sun |
| Freel Post Office (historical) | Freel Post Office (historical) | Polk | 758 | Hartford |
| Midway Post Office (historical) | Midway Post Office (historical) | Polk | 925 | Rising Sun |
| Rising Sun Post Office (historical) | Rising Sun Post Office (historical) | Polk | 958 | Rising Sun |
| Hastie Post Office (historical) | Hastie Post Office (historical) | Polk | 896 | Rising Sun |
| Adelphi Post Office (historical) | Adelphi Post Office (historical) | Polk | 863 | Rising Sun |
| Ivy Post Office (historical) | Ivy Post Office (historical) | Polk | 892 | Rising Sun |
| Crocker Post Office (historical) | Crocker Post Office (historical) | Polk | 981 | Polk City |
| Palmer Post Office (historical) | Palmer Post Office (historical) | Polk | 991 | Polk City |
| Santiago Post Office (historical) | Santiago Post Office (historical) | Polk | 863 | Mitchellville |
| Apple Grove Post Office (historical) | Apple Grove Post Office (historical) | Polk | 912 | Mitchellville |
| Farrar Post Office (historical) | Farrar Post Office (historical) | Polk | 974 | Mingo |
| Peoria City Post Office (historical) | Peoria City Post Office (historical) | Polk | 928 | Mingo |
| Tibbitt Post Office (historical) | Tibbitt Post Office (historical) | Polk | 817 | Loring |
| Loring Post Office (historical) | Loring Post Office (historical) | Polk | 909 | Loring |
| Oldfield Post Office (historical) | Oldfield Post Office (historical) | Polk | 840 | Loring |
| Ayers Grove Post Office (historical) | Ayers Grove Post Office (historical) | Polk | 981 | Grimes |
| Rider Post Office (historical) | Rider Post Office (historical) | Polk | 978 | Grimes |
| Hopkins' Grove Post Office (historical) | Hopkins' Grove Post Office (historical) | Polk | 928 | Granger |
| Hatton Post Office (historical) | Hatton Post Office (historical) | Polk | 978 | Granger |
| Tyner Post Office (historical) | Tyner Post Office (historical) | Polk | 978 | Elkhart |
| North Des Moines Post Office (historical) | North Des Moines Post Office (historical) | Polk | 915 | Des Moines SW |
| University Place Post Office (historical) | University Place Post Office (historical) | Polk | 942 | Des Moines SW |
| Oakwood Station Post Office (historical) | Oakwood Station Post Office (historical) | Polk | 846 | Des Moines SE |
| Oakwood Post Office (historical) | Oakwood Post Office (historical) | Polk | 846 | Des Moines SE |
| Avon Post Office (historical) | Avon Post Office (historical) | Polk | 784 | Des Moines SE |
| Carbondale Post Office (historical) | Carbondale Post Office (historical) | Polk | 899 | Des Moines SE |
| East Des Moines Post Office (historical) | East Des Moines Post Office (historical) | Polk | 787 | Des Moines SE |
| Fort Des Moines Post Office (historical) | Fort Des Moines Post Office (historical) | Polk | 948 | Des Moines SE |
| Levey Post Office (historical) | Levey Post Office (historical) | Polk | 781 | Des Moines SE |
| Lincoln Post Office (historical) | Lincoln Post Office (historical) | Polk | 919 | Granger |
| Sevastapol Post Office (historical) | Sevastapol Post Office (historical) | Polk | 807 | Des Moines SE |
| Kirkwood Post Office (historical) | Kirkwood Post Office (historical) | Polk | 830 | Des Moines NW |
| McDevitt Post Office (historical) | McDevitt Post Office (historical) | Polk | 948 | Des Moines NW |
| Alleman Post Office | Alleman Post Office | Polk | 1007 | Elkhart |
| Herrold Post Office (historical) | Herrold Post Office (historical) | Polk | 853 | Des Moines NW |
| Clive Post Office (historical) | Clive Post Office (historical) | Polk | 833 | Des Moines SW |
| Towner Post Office (historical) | Towner Post Office (historical) | Polk | 840 | Grimes |
| Ridgedale Post Office (historical) | Ridgedale Post Office (historical) | Polk | 1001 | Des Moines NW |
| Keen Post Office (historical) | Keen Post Office (historical) | Polk | 892 | Des Moines NW |
| Saylorville Post Office (historical) | Saylorville Post Office (historical) | Polk | 889 | Des Moines NW |
| Everton Post Office (historical) | Everton Post Office (historical) | Polk | 912 | Des Moines NW |
| Sheldahl Post Office | Sheldahl Post Office | Story | 1037 | Polk City |
| Springville Post Office | Springville Post Office | Linn | 833 | Springville |
| Mount Vernon Post Office | Mount Vernon Post Office | Linn | 863 | Mount Vernon |
| Lisbon Post Office | Lisbon Post Office | Linn | 860 | Mount Vernon |
| Coggon Post Office | Coggon Post Office | Linn | 935 | Coggon |
| Central City Post Office | Central City Post Office | Linn | 837 | Central City |
| Alburnett Post Office | Alburnett Post Office | Linn | 889 | Central City |
| Robins Post Office | Robins Post Office | Linn | 853 | Cedar Rapids North |
| Palo Post Office | Palo Post Office | Linn | 745 | Shellsburg |
| Hiawatha Post Office | Hiawatha Post Office | Linn | 820 | Cedar Rapids North |
| Bertram Post Office (historical) | Bertram Post Office (historical) | Linn | 732 | Bertram |
| Fairfax Post Office | Fairfax Post Office | Linn | 771 | Fairfax |
| Ely Post Office | Ely Post Office | Linn | 732 | Ely |
| Prairieburg Post Office (historical) | Prairieburg Post Office (historical) | Linn | 997 | Prairieburg |
| Center Point Post Office | Center Point Post Office | Linn | 814 | Center Point |
| Des Moines Post Office | Des Moines Post Office | Polk | 873 | Des Moines SE |
| University Post Office | University Post Office | Polk | 955 | Des Moines SW |
| West Des Moines Post Office (historical) | West Des Moines Post Office (historical) | Polk | 810 | Des Moines SW |
| Carney Post Office (historical) | Carney Post Office (historical) | Polk | 935 | Des Moines NE |