Select different State:
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| North Newry Post Office | North Newry Post Office | Oxford | 741 | Puzzle Mountain |
| Stacyville Post Office | Stacyville Post Office | Penobscot | 518 | Benedicta |
| Wyman Dam Post Office | Wyman Dam Post Office | Somerset | 469 | Bingham |
| Mount Desert Post Office | Mount Desert Post Office | Hancock | 13 | Southwest Harbor |
| Bath Post Office | Bath Post Office | Sagadahoc | 26 | Bath |
| Bay Point Post Office (historical) | Bay Point Post Office (historical) | Sagadahoc | Unknown | |
| Bowdoin Post Office (historical) | Bowdoin Post Office (historical) | Sagadahoc | Unknown | |
| Bowdoin Center Post Office (historical) | Bowdoin Center Post Office (historical) | Sagadahoc | Unknown | |
| Bowdoinham Post Office | Bowdoinham Post Office | Sagadahoc | Unknown | |
| Cathance Post Office (historical) | Cathance Post Office (historical) | Sagadahoc | Unknown | |
| Dresden Camp Ground Post Office (historical) | Dresden Camp Ground Post Office (historical) | Sagadahoc | Unknown | |
| East Bowdoinham Post Office (historical) | East Bowdoinham Post Office (historical) | Sagadahoc | Unknown | |
| East Woolwich Post Office (historical) | East Woolwich Post Office (historical) | Sagadahoc | Unknown | |
| Five Islands Post Office (historical) | Five Islands Post Office (historical) | Sagadahoc | Unknown | |
| Georgetown Post Office | Georgetown Post Office | Sagadahoc | Unknown | |
| Iceboro Post Office (historical) | Iceboro Post Office (historical) | Sagadahoc | Unknown | |
| MacMahan Post Office (historical) | MacMahan Post Office (historical) | Sagadahoc | Unknown | |
| Montsweag Post Office (historical) | Montsweag Post Office (historical) | Sagadahoc | Unknown | |
| North Bath Post Office (historical) | North Bath Post Office (historical) | Sagadahoc | Unknown | |
| Parkerhead Post Office (historical) | Parkerhead Post Office (historical) | Sagadahoc | Unknown | |
| Pejepscot Post Office (historical) | Pejepscot Post Office (historical) | Sagadahoc | Unknown | |
| Phippsburg Post Office | Phippsburg Post Office | Sagadahoc | Unknown | |
| Popham Beach Post Office (historical) | Popham Beach Post Office (historical) | Sagadahoc | Unknown | |
| Richmond Camp Ground Post Office (historical) | Richmond Camp Ground Post Office (historical) | Sagadahoc | Unknown | |
| Richmond Corner Post Office | Richmond Corner Post Office | Sagadahoc | Unknown | |
| Robinhood Post Office | Robinhood Post Office | Sagadahoc | Unknown | |
| Sebasco Estates Post Office | Sebasco Estates Post Office | Sagadahoc | Unknown | |
| Small Point Beach Post Office | Small Point Beach Post Office | Sagadahoc | Unknown | |
| Small Point Post Office (historical) | Small Point Post Office (historical) | Sagadahoc | Unknown | |
| Topsham Post Office | Topsham Post Office | Sagadahoc | Unknown | |
| West Bowdoin Post Office | West Bowdoin Post Office | Sagadahoc | Unknown | |
| West Georgetown Post Office (historical) | West Georgetown Post Office (historical) | Sagadahoc | Unknown | |
| West Woolwich Post Office (historical) | West Woolwich Post Office (historical) | Sagadahoc | Unknown | |
| Westpoint Post Office (historical) | Westpoint Post Office (historical) | Sagadahoc | Unknown | |
| Winnegance Post Office (historical) | Winnegance Post Office (historical) | Sagadahoc | Unknown | |
| Winnegance Post Office | Winnegance Post Office | Sagadahoc | Unknown | |
| Woolwich Post Office | Woolwich Post Office | Sagadahoc | Unknown | |
| Albany Post Office (historical) | Albany Post Office (historical) | Oxford | Unknown | |
| Andover Post Office | Andover Post Office | Oxford | 702 | Andover |
| Barrett Post Office (historical) | Barrett Post Office (historical) | Oxford | Unknown | |
| Berlin Post Office (historical) | Berlin Post Office (historical) | Oxford | Unknown | |
| Bethel Post Office | Bethel Post Office | Oxford | Unknown | |
| Birches Post Office (historical) | Birches Post Office (historical) | Oxford | Unknown | |
| Brownfield Centre Post Office (historical) | Brownfield Centre Post Office (historical) | Oxford | Unknown | |
| Brownfield Post Office | Brownfield Post Office | Oxford | Unknown | |
| Bryant Pond Post Office | Bryant Pond Post Office | Oxford | Unknown | |
| Byron Post Office (historical) | Byron Post Office (historical) | Oxford | Unknown | |
| Buckfield Post Office | Buckfield Post Office | Oxford | Unknown | |
| Camp Caribou Post Office (historical) | Camp Caribou Post Office (historical) | Oxford | Unknown | |
| Canton Mills Post Office (historical) | Canton Mills Post Office (historical) | Oxford | Unknown | |
| Canton Point Post Office (historical) | Canton Point Post Office (historical) | Oxford | Unknown | |
| Center Lovell Post Office | Center Lovell Post Office | Oxford | Unknown | |
| Cupsuptic Post Office (historical) | Cupsuptic Post Office (historical) | Oxford | Unknown | |
| Denmark Post Office | Denmark Post Office | Oxford | Unknown | |
| Dickvale Post Office (historical) | Dickvale Post Office (historical) | Oxford | Unknown | |
| Dixfield Center Post Office (historical) | Dixfield Center Post Office (historical) | Oxford | Unknown | |
| Dixfield Post Office | Dixfield Post Office | Oxford | Unknown | |
| East Andover Post Office | East Andover Post Office | Oxford | Unknown | |
| East Bethel Post Office (historical) | East Bethel Post Office (historical) | Oxford | Unknown | |
| East Brownfield Post Office | East Brownfield Post Office | Oxford | Unknown | |
| East Denmark Post Office (historical) | East Denmark Post Office (historical) | Oxford | Unknown | |
| East Dixfield Post Office (historical) | East Dixfield Post Office (historical) | Oxford | Unknown | |
| East Milton Post Office (historical) | East Milton Post Office (historical) | Oxford | Unknown | |
| East Peru Post Office | East Peru Post Office | Oxford | Unknown | |
| East Rumford Post Office (historical) | East Rumford Post Office (historical) | Oxford | Unknown | |
| East Stoneham Post Office | East Stoneham Post Office | Oxford | Unknown | |
| East Sumner Post Office | East Sumner Post Office | Oxford | Unknown | |
| East Waterford Post Office (historical) | East Waterford Post Office (historical) | Oxford | Unknown | |
| Frye Post Office (historical) | Frye Post Office (historical) | Oxford | Unknown | |
| Fryeburg Center Post Office (historical) | Fryeburg Center Post Office (historical) | Oxford | Unknown | |
| Fryeburg Post Office | Fryeburg Post Office | Oxford | Unknown | |
| Gilbertville Post Office (historical) | Gilbertville Post Office (historical) | Oxford | Unknown | |
| Gilead Post Office (historical) | Gilead Post Office (historical) | Oxford | Unknown | |
| Grafton Post Office (historical) | Grafton Post Office (historical) | Oxford | Unknown | |
| Greenwood Post Office (historical) | Greenwood Post Office (historical) | Oxford | Unknown | |
| Greenwood Mountain Post Office | Greenwood Mountain Post Office | Oxford | Unknown | |
| Hale Post Office (historical) | Hale Post Office (historical) | Oxford | Unknown | |
| Hanover Post Office | Hanover Post Office | Oxford | Unknown | |
| Harbor Post Office (historical) | Harbor Post Office (historical) | Oxford | Unknown | |
| Hartford Post Office (historical) | Hartford Post Office (historical) | Oxford | Unknown | |
| Hastings Post Office (historical) | Hastings Post Office (historical) | Oxford | Unknown | |
| Hebron Post Office (historical) | Hebron Post Office (historical) | Oxford | Unknown | |
| Hebron Station Post Office (historical) | Hebron Station Post Office (historical) | Oxford | Unknown | |
| Hiram Post Office | Hiram Post Office | Oxford | Unknown | |
| Houghton Post Office (historical) | Houghton Post Office (historical) | Oxford | Unknown | |
| Ketchum Post Office (historical) | Ketchum Post Office (historical) | Oxford | 945 | Old Speck Mountain |
| Littlefield Post Office (historical) | Littlefield Post Office (historical) | Oxford | Unknown | |
| Locke Mills Post Office | Locke Mills Post Office | Oxford | Unknown | |
| Lovell Post Office | Lovell Post Office | Oxford | Unknown | |
| Lynchville Post Office (historical) | Lynchville Post Office (historical) | Oxford | Unknown | |
| Meadows Post Office (historical) | Meadows Post Office (historical) | Oxford | Unknown | |
| Meadowview Post Office (historical) | Meadowview Post Office (historical) | Oxford | Unknown | |
| Mexico Post Office | Mexico Post Office | Oxford | Unknown | |
| Middledam Post Office (historical) | Middledam Post Office (historical) | Oxford | Unknown | |
| Milton Plantation Post Office (historical) | Milton Plantation Post Office (historical) | Oxford | Unknown | |
| Mount Zircon Post Office (historical) | Mount Zircon Post Office (historical) | Oxford | Unknown | |
| Newry Post Office (historical) | Newry Post Office (historical) | Oxford | Unknown | |
| North Albany Post Office (historical) | North Albany Post Office (historical) | Oxford | Unknown | |
| North Bethel Post Office (historical) | North Bethel Post Office (historical) | Oxford | Unknown | |
| North Brownfield Post Office (historical) | North Brownfield Post Office (historical) | Oxford | Unknown | |
| North Buckfield Post Office (historical) | North Buckfield Post Office (historical) | Oxford | Unknown | |
| North Fryeburg Post Office | North Fryeburg Post Office | Oxford | Unknown | |
| North Lovell Post Office | North Lovell Post Office | Oxford | Unknown | |
| North Newry Post Office (historical) | North Newry Post Office (historical) | Oxford | Unknown | |
| North Norway Post Office (historical) | North Norway Post Office (historical) | Oxford | Unknown | |
| North Paris Post Office (historical) | North Paris Post Office (historical) | Oxford | Unknown | |
| North Porter Post Office (historical) | North Porter Post Office (historical) | Oxford | Unknown | |
| North Rumford Post Office (historical) | North Rumford Post Office (historical) | Oxford | Unknown | |
| North Waterford Post Office | North Waterford Post Office | Oxford | Unknown | |
| North Woodstock Post Office (historical) | North Woodstock Post Office (historical) | Oxford | Unknown | |
| Norway Center Post Office (historical) | Norway Center Post Office (historical) | Oxford | Unknown | |
| Norway Lake Post Office | Norway Lake Post Office | Oxford | Unknown | |
| Norway Post Office | Norway Post Office | Oxford | Unknown | |
| Oxford Post Office | Oxford Post Office | Oxford | Unknown | |
| Paris Post Office | Paris Post Office | Oxford | Unknown | |
| Peru Post Office | Peru Post Office | Oxford | Unknown | |
| Pleasant Island Post Office | Pleasant Island Post Office | Oxford | Unknown | |
| Porter Post Office | Porter Post Office | Oxford | Unknown | |
| Porterfield Post Office (historical) | Porterfield Post Office (historical) | Oxford | Unknown | |
| Redding Post Office (historical) | Redding Post Office (historical) | Oxford | Unknown | |
| Ridlonville Post Office (historical) | Ridlonville Post Office (historical) | Oxford | 440 | Rumford |
| Roxbury Post Office | Roxbury Post Office | Oxford | Unknown | |
| Rumford Center Post Office | Rumford Center Post Office | Oxford | Unknown | |
| Rumford Corner Post Office (historical) | Rumford Corner Post Office (historical) | Oxford | Unknown | |
| Rumford Post Office (historical) | Rumford Post Office (historical) | Oxford | Unknown | |
| Rumford Post Office | Rumford Post Office | Oxford | Unknown | |
| Rumford Point Post Office (historical) | Rumford Point Post Office (historical) | Oxford | Unknown | |
| Snow Falls Post Office (historical) | Snow Falls Post Office (historical) | Oxford | Unknown | |
| South Albany Post Office (historical) | South Albany Post Office (historical) | Oxford | Unknown | |
| South Andover Post Office (historical) | South Andover Post Office (historical) | Oxford | Unknown | |
| South Berwick Junction Post Office (historical) | South Berwick Junction Post Office (historical) | Oxford | Unknown | |
| South Bethel Post Office (historical) | South Bethel Post Office (historical) | Oxford | Unknown | |
| South Hartford Post Office (historical) | South Hartford Post Office (historical) | Oxford | Unknown | |
| South Hiram Post Office | South Hiram Post Office | Oxford | Unknown | |
| South Newry Post Office (historical) | South Newry Post Office (historical) | Oxford | Unknown | |
| South Paris Post Office | South Paris Post Office | Oxford | 384 | Norway |
| South Rumford Post Office (historical) | South Rumford Post Office (historical) | Oxford | Unknown | |
| South Waterford Post Office | South Waterford Post Office | Oxford | Unknown | |
| South Woodstock Post Office (historical) | South Woodstock Post Office (historical) | Oxford | Unknown | |
| Stanley Post Office (historical) | Stanley Post Office (historical) | Oxford | Unknown | |
| Stow Post Office | Stow Post Office | Oxford | Unknown | |
| Sumner Post Office (historical) | Sumner Post Office (historical) | Oxford | Unknown | |
| Suncook Post Office (historical) | Suncook Post Office (historical) | Oxford | Unknown | |
| Sweden Post Office (historical) | Sweden Post Office (historical) | Oxford | Unknown | |
| Upper Dam Post Office | Upper Dam Post Office | Oxford | Unknown | |
| Upton Post Office | Upton Post Office | Oxford | Unknown | |
| Wadsworth Post Office (historical) | Wadsworth Post Office (historical) | Oxford | Unknown | |
| Waterford Post Office | Waterford Post Office | Oxford | Unknown | |
| Welchville Post Office (historical) | Welchville Post Office (historical) | Oxford | Unknown | |
| West Bethel Post Office (historical) | West Bethel Post Office (historical) | Oxford | Unknown | |
| West Brownfield Post Office (historical) | West Brownfield Post Office (historical) | Oxford | Unknown | |
| West Buckfield Post Office (historical) | West Buckfield Post Office (historical) | Oxford | Unknown | |
| West Denmark Post Office (historical) | West Denmark Post Office (historical) | Oxford | Unknown | |
| West Fryeburg Post Office (historical) | West Fryeburg Post Office (historical) | Oxford | Unknown | |
| West Paris Post Office | West Paris Post Office | Oxford | Unknown | |
| West Peru Post Office | West Peru Post Office | Oxford | Unknown | |
| West Sumner Post Office | West Sumner Post Office | Oxford | Unknown | |
| Woodstock Post Office (historical) | Woodstock Post Office (historical) | Oxford | Unknown | |
| Zircon Post Office (historical) | Zircon Post Office (historical) | Oxford | Unknown | |
| Wilsons Mills Post Office | Wilsons Mills Post Office | Oxford | 1293 | Wilsons Mills |
| Alder Post Office (historical) | Alder Post Office (historical) | Franklin | Unknown | |
| Allens Mills Post Office (historical) | Allens Mills Post Office (historical) | Franklin | Unknown | |
| Avon Post Office (historical) | Avon Post Office (historical) | Franklin | Unknown | |
| Bald Mountain Post Office | Bald Mountain Post Office | Franklin | Unknown | |
| Barker Post Office (historical) | Barker Post Office (historical) | Franklin | Unknown | |
| Beans Corner Post Office (historical) | Beans Corner Post Office (historical) | Franklin | Unknown | |
| Beattie Post Office (historical) | Beattie Post Office (historical) | Franklin | Unknown | |
| Bemis Post Office (historical) | Bemis Post Office (historical) | Franklin | Unknown | |
| Berry Mills Post Office (historical) | Berry Mills Post Office (historical) | Franklin | Unknown | |
| Big Island Post Office (historical) | Big Island Post Office (historical) | Franklin | Unknown | |
| Bigelow Post Office (historical) | Bigelow Post Office (historical) | Franklin | Unknown | |
| Carrabassett Post Office (historical) | Carrabassett Post Office (historical) | Franklin | Unknown | |
| Chain of Ponds Post Office (historical) | Chain of Ponds Post Office (historical) | Franklin | Unknown | |
| Chesterville Post Office (historical) | Chesterville Post Office (historical) | Franklin | Unknown | |
| Chisholm Post Office (historical) | Chisholm Post Office (historical) | Franklin | Unknown | |
| Coburn Gore Post Office | Coburn Gore Post Office | Franklin | Unknown | |
| Coplin Post Office (historical) | Coplin Post Office (historical) | Franklin | Unknown | |
| Dallas Post Office (historical) | Dallas Post Office (historical) | Franklin | Unknown | |
| Dryden Post Office | Dryden Post Office | Franklin | Unknown | |
| East New Sharon Post Office (historical) | East New Sharon Post Office (historical) | Franklin | Unknown | |
| East New Vineyard Post Office (historical) | East New Vineyard Post Office (historical) | Franklin | Unknown | |
| East Strong Post Office | East Strong Post Office | Franklin | Unknown | |
| East Wilton Post Office (historical) | East Wilton Post Office (historical) | Franklin | Unknown | |
| East Madrid Post Office (historical) | East Madrid Post Office (historical) | Franklin | Unknown | |
| Eustis Post Office | Eustis Post Office | Franklin | Unknown | |
| Fairbanks Post Office (historical) | Fairbanks Post Office (historical) | Franklin | Unknown | |
| Farmington Falls Post Office | Farmington Falls Post Office | Franklin | Unknown | |
| Farmington Post Office | Farmington Post Office | Franklin | Unknown | |
| Freeman Post Office (historical) | Freeman Post Office (historical) | Franklin | Unknown | |
| Grants Post Office | Grants Post Office | Franklin | Unknown | |
| Greenvale Post Office (historical) | Greenvale Post Office (historical) | Franklin | Unknown | |
| Haines Landing Post Office (historical) | Haines Landing Post Office (historical) | Franklin | Unknown | |
| Indian Rock Post Office (historical) | Indian Rock Post Office (historical) | Franklin | Unknown | |
| Jacksonville Post Office (historical) | Jacksonville Post Office (historical) | Franklin | Unknown | |
| Jay Bridge Post Office (historical) | Jay Bridge Post Office (historical) | Franklin | Unknown | |
| Jimpond Post Office (historical) | Jimpond Post Office (historical) | Franklin | Unknown | |
| Kingfield Post Office | Kingfield Post Office | Franklin | Unknown | |
| Loon Lake Post Office (historical) | Loon Lake Post Office (historical) | Franklin | Unknown | |
| Macy Post Office (historical) | Macy Post Office (historical) | Franklin | Unknown | |
| Madrid Post Office (historical) | Madrid Post Office (historical) | Franklin | Unknown | |
| Milton Springs Post Office (historical) | Milton Springs Post Office (historical) | Franklin | Unknown | |
| Mooselookmeguntic Post Office | Mooselookmeguntic Post Office | Franklin | Unknown | |
| Nashville Post Office (historical) | Nashville Post Office (historical) | Franklin | Unknown | |
| New Sharon Post Office | New Sharon Post Office | Franklin | Unknown | |
| New Vineyard Post Office | New Vineyard Post Office | Franklin | 620 | New Vineyard |
| North Chesterfield Post Office (historical) | North Chesterfield Post Office (historical) | Franklin | Unknown | |
| North Farmington Post Office (historical) | North Farmington Post Office (historical) | Franklin | Unknown | |
| North Freeman Post Office (historical) | North Freeman Post Office (historical) | Franklin | Unknown | |
| North Industry Post Office (historical) | North Industry Post Office (historical) | Franklin | Unknown | |
| North Jay Post Office | North Jay Post Office | Franklin | Unknown | |
| North Wilton Post Office (historical) | North Wilton Post Office (historical) | Franklin | Unknown | |
| Notch Post Office (historical) | Notch Post Office (historical) | Franklin | Unknown | |
| Oquossoc Post Office | Oquossoc Post Office | Franklin | 1532 | Oquossoc |
| Phillips Post Office | Phillips Post Office | Franklin | 561 | Phillips |
| Pratts Corner Post Office (historical) | Pratts Corner Post Office (historical) | Franklin | Unknown | |
| Rangeley Post Office | Rangeley Post Office | Franklin | 1539 | Rangeley |
| Redington Post Office (historical) | Redington Post Office (historical) | Franklin | Unknown | |
| Redington Mills Post Office (historical) | Redington Mills Post Office (historical) | Franklin | Unknown | |
| Reeds Mill Post Office (historical) | Reeds Mill Post Office (historical) | Franklin | Unknown | |
| Richardson Post Office (historical) | Richardson Post Office (historical) | Franklin | Unknown | |
| Riley Post Office (historical) | Riley Post Office (historical) | Franklin | Unknown | |
| Round Mountain Post Office | Round Mountain Post Office | Franklin | Unknown | |
| Saddleback Post Office (historical) | Saddleback Post Office (historical) | Franklin | Unknown | |
| Salem Post Office (historical) | Salem Post Office (historical) | Franklin | Unknown | |
| Skinner Post Office (historical) | Skinner Post Office (historical) | Franklin | Unknown | |
| South Carthage Post Office (historical) | South Carthage Post Office (historical) | Franklin | Unknown | |
| South Chesterville Post Office (historical) | South Chesterville Post Office (historical) | Franklin | Unknown | |
| South Rangeley Post Office (historical) | South Rangeley Post Office (historical) | Franklin | Unknown | |
| Stratton Post Office | Stratton Post Office | Franklin | Unknown | |
| Strong Post Office | Strong Post Office | Franklin | Unknown | |
| Temple Post Office | Temple Post Office | Franklin | Unknown | |
| Tim Post Office (historical) | Tim Post Office (historical) | Franklin | Unknown | |
| Webb Post Office (historical) | Webb Post Office (historical) | Franklin | Unknown | |
| Weld Post Office | Weld Post Office | Franklin | Unknown | |
| West Farmington Post Office (historical) | West Farmington Post Office (historical) | Franklin | Unknown | |
| West Freeman Post Office (historical) | West Freeman Post Office (historical) | Franklin | Unknown | |
| West Mills Post Office (historical) | West Mills Post Office (historical) | Franklin | Unknown | |
| West Wilton Post Office (historical) | West Wilton Post Office (historical) | Franklin | Unknown | |
| Wilton Post Office | Wilton Post Office | Franklin | Unknown | |
| Mountainview Post Office (historical) | Mountainview Post Office (historical) | Franklin | Unknown | |
| Anson Post Office | Anson Post Office | Somerset | 285 | Madison West |
| Athens Post Office | Athens Post Office | Somerset | Unknown | |
| Bates Post Office (historical) | Bates Post Office (historical) | Somerset | Unknown | |
| Bingham Post Office | Bingham Post Office | Somerset | Unknown | |
| Blackwell Post Office (historical) | Blackwell Post Office (historical) | Somerset | Unknown | |
| Bloomfield Post Office (historical) | Bloomfield Post Office (historical) | Somerset | Unknown | |
| Boston Ranch Post Office (historical) | Boston Ranch Post Office (historical) | Somerset | Unknown | |
| Branch Post Office (historical) | Branch Post Office (historical) | Somerset | Unknown | |
| Brighton Post Office | Brighton Post Office | Somerset | Unknown | |
| Cambridge Post Office | Cambridge Post Office | Somerset | Unknown | |
| Canaan Line Post Office (historical) | Canaan Line Post Office (historical) | Somerset | Unknown | |
| Canaan Post Office | Canaan Post Office | Somerset | 322 | Canaan |
| Canada Line Post Office (historical) | Canada Line Post Office (historical) | Somerset | Unknown | |
| Canada Road Post Office (historical) | Canada Road Post Office (historical) | Somerset | Unknown | |
| Caratunk Post Office | Caratunk Post Office | Somerset | Unknown | |
| Carrie Pond Post Office (historical) | Carrie Pond Post Office (historical) | Somerset | Unknown | |
| Concord Post Office (historical) | Concord Post Office (historical) | Somerset | Unknown | |
| Cornville Post Office (historical) | Cornville Post Office (historical) | Somerset | Unknown | |
| Crockerville Post Office (historical) | Crockerville Post Office (historical) | Somerset | Unknown | |
| Davidsville Post Office (historical) | Davidsville Post Office (historical) | Somerset | Unknown | |
| Dead River Post Office (historical) | Dead River Post Office (historical) | Somerset | Unknown | |
| Deadwater Post Office | Deadwater Post Office | Somerset | Unknown | |
| Detroit Post Office | Detroit Post Office | Somerset | Unknown | |
| East Athens Post Office (historical) | East Athens Post Office (historical) | Somerset | Unknown | |
| East Cornville Post Office (historical) | East Cornville Post Office (historical) | Somerset | Unknown | |
| East Madison Post Office (historical) | East Madison Post Office (historical) | Somerset | Unknown | |
| East Mercer Post Office (historical) | East Mercer Post Office (historical) | Somerset | Unknown | |
| East Milburne Post Office (historical) | East Milburne Post Office (historical) | Somerset | Unknown | |
| East New Portland Post Office | East New Portland Post Office | Somerset | Unknown | |
| East Pond Post Office (historical) | East Pond Post Office (historical) | Somerset | Unknown | |
| East Saint Albans Post Office (historical) | East Saint Albans Post Office (historical) | Somerset | Unknown | |
| Embden Post Office (historical) | Embden Post Office (historical) | Somerset | Unknown | |
| Embden Centre Post Office (historical) | Embden Centre Post Office (historical) | Somerset | Unknown | |
| Fairfield Center Post Office (historical) | Fairfield Center Post Office (historical) | Somerset | Unknown | |
| Fairfield Corners Post Office (historical) | Fairfield Corners Post Office (historical) | Somerset | Unknown | |
| Fairfield Post Office (historical) | Fairfield Post Office (historical) | Somerset | 102 | Fairfield |
| Flagstaff Post Office (historical) | Flagstaff Post Office (historical) | Somerset | Unknown | |
| Gerard Post Office (historical) | Gerard Post Office (historical) | Somerset | Unknown | |
| Harmony Post Office | Harmony Post Office | Somerset | Unknown | |
| Hartland Post Office (historical) | Hartland Post Office (historical) | Somerset | Unknown | |
| Highland Post Office (historical) | Highland Post Office (historical) | Somerset | Unknown | |
| Hinckley Post Office | Hinckley Post Office | Somerset | Unknown | |
| Holeb Post Office | Holeb Post Office | Somerset | Unknown | |
| Jackman Post Office (historical) | Jackman Post Office (historical) | Somerset | Unknown | |
| Lake Austin Post Office (historical) | Lake Austin Post Office (historical) | Somerset | Unknown | |
| Lake Moxie Post Office (historical) | Lake Moxie Post Office (historical) | Somerset | Unknown | |
| Lake Parlin Post Office (historical) | Lake Parlin Post Office (historical) | Somerset | Unknown | |
| Lakewood Post Office | Lakewood Post Office | Somerset | Unknown | |
| Larone Post Office (historical) | Larone Post Office (historical) | Somerset | Unknown | |
| Lexington Post Office (historical) | Lexington Post Office (historical) | Somerset | Unknown | |
| Long Pond Post Office | Long Pond Post Office | Somerset | Unknown | |
| MacKamp Post Office (historical) | MacKamp Post Office (historical) | Somerset | Unknown | |
| Madison Center Post Office (historical) | Madison Center Post Office (historical) | Somerset | Unknown | |
| Madison Post Office | Madison Post Office | Somerset | 292 | Madison West |
| Mainstream Post Office (historical) | Mainstream Post Office (historical) | Somerset | Unknown | |
| Mayfield Post Office (historical) | Mayfield Post Office (historical) | Somerset | Unknown | |
| Mercer Post Office | Mercer Post Office | Somerset | Unknown | |
| Moose River Post Office | Moose River Post Office | Somerset | Unknown | |
| Moscow Post Office (historical) | Moscow Post Office (historical) | Somerset | Unknown | |
| New Portland Post Office | New Portland Post Office | Somerset | Unknown | |
| Norridgewock Post Office | Norridgewock Post Office | Somerset | Unknown | |
| North Cornville Post Office (historical) | North Cornville Post Office (historical) | Somerset | Unknown | |
| North Fairfield Post Office | North Fairfield Post Office | Somerset | Unknown | |
| North Madison Post Office (historical) | North Madison Post Office (historical) | Somerset | Unknown | |
| North New Portland Post Office | North New Portland Post Office | Somerset | Unknown | |
| North Norridgewock Post Office (historical) | North Norridgewock Post Office (historical) | Somerset | Unknown | |
| North Solon Post Office | North Solon Post Office | Somerset | Unknown | |
| Number Two Post Office (historical) | Number Two Post Office (historical) | Somerset | Unknown | |
| Ogontz Post Office (historical) | Ogontz Post Office (historical) | Somerset | Unknown | |
| Palmyra Post Office | Palmyra Post Office | Somerset | Unknown | |
| Parlin Pond Post Office (historical) | Parlin Pond Post Office (historical) | Somerset | Unknown | |
| Pittsfield Post Office (historical) | Pittsfield Post Office (historical) | Somerset | Unknown | |
| Pleasant Pond Post Office (historical) | Pleasant Pond Post Office (historical) | Somerset | Unknown | |
| Revere Post Office (historical) | Revere Post Office (historical) | Somerset | Unknown | |
| Ripley Post Office (historical) | Ripley Post Office (historical) | Somerset | Unknown | |
| Rockwood Post Office | Rockwood Post Office | Somerset | Unknown | |
| Rowe Pond Post Office (historical) | Rowe Pond Post Office (historical) | Somerset | Unknown | |
| Sandy Bay Post Office (historical) | Sandy Bay Post Office (historical) | Somerset | Unknown | |
| Savage Post Office (historical) | Savage Post Office (historical) | Somerset | Unknown | |
| Seboomook Post Office (historical) | Seboomook Post Office (historical) | Somerset | Unknown | |
| Shawmut Post Office | Shawmut Post Office | Somerset | Unknown | |
| Shirley Post Office (historical) | Shirley Post Office (historical) | Somerset | Unknown | |
| Shorey Post Office (historical) | Shorey Post Office (historical) | Somerset | Unknown | |
| Skowhegan Falls Post Office (historical) | Skowhegan Falls Post Office (historical) | Somerset | Unknown | |
| Skowhegan Post Office | Skowhegan Post Office | Somerset | 167 | Skowhegan |
| Smithfield Post Office | Smithfield Post Office | Somerset | Unknown | |
| Solon Post Office | Solon Post Office | Somerset | Unknown | |
| Somerset Post Office (historical) | Somerset Post Office (historical) | Somerset | Unknown | |
| Somerset Junction Post Office (historical) | Somerset Junction Post Office (historical) | Somerset | Unknown | |
| South Bloomfield Post Office (historical) | South Bloomfield Post Office (historical) | Somerset | Unknown | |
| South Pittsfield Post Office (historical) | South Pittsfield Post Office (historical) | Somerset | Unknown | |
| South Smithfield Post Office (historical) | South Smithfield Post Office (historical) | Somerset | Unknown | |
| South Solon Post Office (historical) | South Solon Post Office (historical) | Somerset | Unknown | |
| Spencer Post Office | Spencer Post Office | Somerset | Unknown | |
| Spring Lake Post Office (historical) | Spring Lake Post Office (historical) | Somerset | Unknown | |
| Starks Post Office | Starks Post Office | Somerset | Unknown | |
| Stronghold Post Office (historical) | Stronghold Post Office (historical) | Somerset | Unknown | |
| Tarratine Post Office | Tarratine Post Office | Somerset | Unknown | |
| The Birches Post Office | The Birches Post Office | Somerset | Unknown | |
| The Forks Post Office | The Forks Post Office | Somerset | Unknown | |
| Troutdale Post Office (historical) | Troutdale Post Office (historical) | Somerset | Unknown | |
| Webber Post Office (historical) | Webber Post Office (historical) | Somerset | Unknown | |
| West Anson Post Office (historical) | West Anson Post Office (historical) | Somerset | Unknown | |
| West Athens Post Office (historical) | West Athens Post Office (historical) | Somerset | Unknown | |
| West Cornville Post Office (historical) | West Cornville Post Office (historical) | Somerset | Unknown | |
| West Embden Post Office (historical) | West Embden Post Office (historical) | Somerset | Unknown | |
| West Forks Post Office (historical) | West Forks Post Office (historical) | Somerset | Unknown | |
| West Madison Post Office (historical) | West Madison Post Office (historical) | Somerset | Unknown | |
| West Moscow Post Office (historical) | West Moscow Post Office (historical) | Somerset | Unknown | |
| West Outlet Post Office | West Outlet Post Office | Somerset | Unknown | |
| West Palmyra Post Office (historical) | West Palmyra Post Office (historical) | Somerset | Unknown | |
| West Pittsfield Post Office (historical) | West Pittsfield Post Office (historical) | Somerset | Unknown | |
| Wyman Dam Post Office (historical) | Wyman Dam Post Office (historical) | Somerset | Unknown | |
| Alta Post Office (historical) | Alta Post Office (historical) | Androscoggin | Unknown | |
| Auburn Plains Post Office (historical) | Auburn Plains Post Office (historical) | Androscoggin | Unknown | |
| Auburn Post Office | Auburn Post Office | Androscoggin | 125 | Lewiston |
| Auburn South Dam Post Office (historical) | Auburn South Dam Post Office (historical) | Androscoggin | Unknown | |
| Chase Mills Post Office (historical) | Chase Mills Post Office (historical) | Androscoggin | Unknown | |
| Curtis Corner Post Office | Curtis Corner Post Office | Androscoggin | Unknown | |
| Danville Post Office | Danville Post Office | Androscoggin | Unknown | |
| Dirigo Post Office (historical) | Dirigo Post Office (historical) | Androscoggin | Unknown | |
| Durham Post Office (historical) | Durham Post Office (historical) | Androscoggin | Unknown | |
| East Auburn Post Office (historical) | East Auburn Post Office (historical) | Androscoggin | Unknown | |
| East Livermore Mills Post Office (historical) | East Livermore Mills Post Office (historical) | Androscoggin | Unknown | |
| East Minot Post Office (historical) | East Minot Post Office (historical) | Androscoggin | Unknown | |
| East Poland Post Office | East Poland Post Office | Androscoggin | Unknown | |
| East Turner Post Office (historical) | East Turner Post Office (historical) | Androscoggin | Unknown | |
| East Wales Post Office (historical) | East Wales Post Office (historical) | Androscoggin | Unknown | |
| Empire Post Office (historical) | Empire Post Office (historical) | Androscoggin | Unknown | |
| Garcelons Ferry Post Office (historical) | Garcelons Ferry Post Office (historical) | Androscoggin | Unknown | |
| Greene Corner Post Office (historical) | Greene Corner Post Office (historical) | Androscoggin | Unknown | |
| Greene Post Office | Greene Post Office | Androscoggin | Unknown | |
| Howes Corner Post Office (historical) | Howes Corner Post Office (historical) | Androscoggin | Unknown | |
| Keens Mills Post Office (historical) | Keens Mills Post Office (historical) | Androscoggin | Unknown | |
| Leeds Junction Post Office (historical) | Leeds Junction Post Office (historical) | Androscoggin | Unknown | |
| Leeds Post Office (historical) | Leeds Post Office (historical) | Androscoggin | Unknown | |
| Leeds Post Office (historical) | Leeds Post Office (historical) | Androscoggin | Unknown | |
| Lewiston Junction Post Office (historical) | Lewiston Junction Post Office (historical) | Androscoggin | Unknown | |
| Lewiston Post Office | Lewiston Post Office | Androscoggin | 190 | Lewiston |
| Lisbon Center Post Office | Lisbon Center Post Office | Androscoggin | 203 | Lisbon Falls North |
| Lisbon Falls Post Office | Lisbon Falls Post Office | Androscoggin | Unknown | |
| Lisbon Plains Post Office (historical) | Lisbon Plains Post Office (historical) | Androscoggin | Unknown | |
| Lisbon Post Office (historical) | Lisbon Post Office (historical) | Androscoggin | Unknown | |
| Livermore Center Post Office (historical) | Livermore Center Post Office (historical) | Androscoggin | Unknown | |
| Livermore Falls Post Office (historical) | Livermore Falls Post Office (historical) | Androscoggin | Unknown | |
| Livermore Post Office (historical) | Livermore Post Office (historical) | Androscoggin | Unknown | |
| Mechanic Falls Post Office | Mechanic Falls Post Office | Androscoggin | Unknown | |
| Minot Post Office | Minot Post Office | Androscoggin | Unknown | |
| North Auburn Post Office (historical) | North Auburn Post Office (historical) | Androscoggin | Unknown | |
| North Greene Post Office (historical) | North Greene Post Office (historical) | Androscoggin | Unknown | |
| North Leeds Post Office | North Leeds Post Office | Androscoggin | Unknown | |
| North Livermore Post Office | North Livermore Post Office | Androscoggin | Unknown | |
| North Turner Bridge Post Office (historical) | North Turner Bridge Post Office (historical) | Androscoggin | Unknown | |
| North Turner Post Office | North Turner Post Office | Androscoggin | Unknown | |
| Poland Spring Post Office | Poland Spring Post Office | Androscoggin | Unknown | |
| Sabattus Post Office | Sabattus Post Office | Androscoggin | Unknown | |
| Shiloh Post Office | Shiloh Post Office | Androscoggin | Unknown | |
| Skillings Post Office (historical) | Skillings Post Office (historical) | Androscoggin | Unknown | |
| South Danville Post Office (historical) | South Danville Post Office (historical) | Androscoggin | Unknown | |
| South Durham Post Office (historical) | South Durham Post Office (historical) | Androscoggin | Unknown | |
| South Leeds Post Office (historical) | South Leeds Post Office (historical) | Androscoggin | Unknown | |
| South Lewiston Post Office (historical) | South Lewiston Post Office (historical) | Androscoggin | Unknown | |
| South Livermore Post Office (historical) | South Livermore Post Office (historical) | Androscoggin | Unknown | |
| South Turner Post Office (historical) | South Turner Post Office (historical) | Androscoggin | Unknown | |
| Strickland Post Office | Strickland Post Office | Androscoggin | Unknown | |
| Turner Center Post Office (historical) | Turner Center Post Office (historical) | Androscoggin | Unknown | |
| Turner Village Post Office (historical) | Turner Village Post Office (historical) | Androscoggin | Unknown | |
| Wales Post Office (historical) | Wales Post Office (historical) | Androscoggin | Unknown | |
| Webster Post Office (historical) | Webster Post Office (historical) | Androscoggin | Unknown | |
| West Auburn Post Office (historical) | West Auburn Post Office (historical) | Androscoggin | Unknown | |
| West Durham Post Office (historical) | West Durham Post Office (historical) | Androscoggin | Unknown | |
| West Leeds Post Office (historical) | West Leeds Post Office (historical) | Androscoggin | Unknown | |
| West Minot Post Office | West Minot Post Office | Androscoggin | Unknown | |
| West Poland Post Office (historical) | West Poland Post Office (historical) | Androscoggin | Unknown | |
| Worthley Post Office (historical) | Worthley Post Office (historical) | Androscoggin | Unknown | |
| Addison Post Office | Addison Post Office | Washington | Unknown | |
| Alexander Post Office | Alexander Post Office | Washington | Unknown | |
| Baileyville Post Office (historical) | Baileyville Post Office (historical) | Washington | Unknown | |
| Baring Post Office | Baring Post Office | Washington | Unknown | |
| Basin Post Office (historical) | Basin Post Office (historical) | Washington | Unknown | |
| Beals Post Office (historical) | Beals Post Office (historical) | Washington | Unknown | |
| Beddington Post Office (historical) | Beddington Post Office (historical) | Washington | Unknown | |
| Bonny Post Office (historical) | Bonny Post Office (historical) | Washington | Unknown | |
| Brookton Post Office | Brookton Post Office | Washington | Unknown | |
| Bucks Harbor Post Office | Bucks Harbor Post Office | Washington | Unknown | |
| Calais Post Office | Calais Post Office | Washington | 72 | Calais |
| Cedar Post Office | Cedar Post Office | Washington | Unknown | |
| Centerville Post Office | Centerville Post Office | Washington | Unknown | |
| Cherryfield Post Office | Cherryfield Post Office | Washington | Unknown | |
| Bobscook Post Office (historical) | Bobscook Post Office (historical) | Washington | Unknown | |
| Columbia Falls Post Office | Columbia Falls Post Office | Washington | Unknown | |
| Columbia Post Office (historical) | Columbia Post Office (historical) | Washington | Unknown | |
| Cooper Post Office | Cooper Post Office | Washington | Unknown | |
| Crawford Post Office | Crawford Post Office | Washington | Unknown | |
| Ayers Post Office | Ayers Post Office | Washington | 95 | Pembroke |
| Cutler Post Office | Cutler Post Office | Washington | Unknown | |
| Dalotville Post Office (historical) | Dalotville Post Office (historical) | Washington | Unknown | |
| Danforth Post Office | Danforth Post Office | Washington | 381 | Danforth |
| Deblois Post Office (historical) | Deblois Post Office (historical) | Washington | Unknown | |
| Dennysville Post Office | Dennysville Post Office | Washington | Unknown | |
| Dewey Post Office (historical) | Dewey Post Office (historical) | Washington | Unknown | |
| Dorman Post Office (historical) | Dorman Post Office (historical) | Washington | Unknown | |
| East Machias Post Office | East Machias Post Office | Washington | Unknown | |
| East Steuben Post Office (historical) | East Steuben Post Office (historical) | Washington | Unknown | |
| Eastport Post Office | Eastport Post Office | Washington | 7 | Eastport |
| Eaton Post Office (historical) | Eaton Post Office (historical) | Washington | Unknown | |
| Epping Post Office (historical) | Epping Post Office (historical) | Washington | Unknown | |
| Forest City Post Office (historical) | Forest City Post Office (historical) | Washington | Unknown | |
| Forest Station Post Office | Forest Station Post Office | Washington | Unknown | |
| Fuller Post Office (historical) | Fuller Post Office (historical) | Washington | Unknown | |
| Gilson Post Office (historical) | Gilson Post Office (historical) | Washington | Unknown | |
| Grand Lake Stream Post Office | Grand Lake Stream Post Office | Washington | 312 | Grand Lake Stream |
| Grove Post Office | Grove Post Office | Washington | Unknown | |
| Halls Mills Post Office (historical) | Halls Mills Post Office (historical) | Washington | Unknown | |
| Harrington Post Office (historical) | Harrington Post Office (historical) | Washington | Unknown | |
| Indian River Post Office (historical) | Indian River Post Office (historical) | Washington | Unknown | |
| Jacksonville Post Office | Jacksonville Post Office | Washington | Unknown | |
| Jonesboro Post Office | Jonesboro Post Office | Washington | Unknown | |
| Jonesport Post Office | Jonesport Post Office | Washington | Unknown | |
| Kellyland Post Office (historical) | Kellyland Post Office (historical) | Washington | Unknown | |
| Kossuth Post Office | Kossuth Post Office | Washington | Unknown | |
| Lambert Lake Post Office (historical) | Lambert Lake Post Office (historical) | Washington | Unknown | |
| Larrabee Post Office (historical) | Larrabee Post Office (historical) | Washington | Unknown | |
| Lubec Mills Post Office (historical) | Lubec Mills Post Office (historical) | Washington | Unknown | |
| Lubec Post Office | Lubec Post Office | Washington | Unknown | |
| Machias Post Office | Machias Post Office | Washington | 69 | Machias |
| Machiasport Post Office | Machiasport Post Office | Washington | Unknown | |
| Maple Point Post Office (historical) | Maple Point Post Office (historical) | Washington | Unknown | |
| Marion Post Office | Marion Post Office | Washington | Unknown | |
| Marion Mills Post Office (historical) | Marion Mills Post Office (historical) | Washington | Unknown | |
| Marshville Post Office (historical) | Marshville Post Office (historical) | Washington | Unknown | |
| Marston Post Office (historical) | Marston Post Office (historical) | Washington | Unknown | |
| Meddybemps Post Office | Meddybemps Post Office | Washington | Unknown | |
| Milbridge Post Office | Milbridge Post Office | Washington | Unknown | |
| Milltown Post Office (historical) | Milltown Post Office (historical) | Washington | Unknown | |
| Monsapec Post Office (historical) | Monsapec Post Office (historical) | Washington | Unknown | |
| North Baileyville Post Office (historical) | North Baileyville Post Office (historical) | Washington | Unknown | |
| North Columbia Post Office (historical) | North Columbia Post Office (historical) | Washington | Unknown | |
| North Cutler Post Office (historical) | North Cutler Post Office (historical) | Washington | Unknown | |
| North Lubec Post Office | North Lubec Post Office | Washington | Unknown | |
| North Perry Post Office (historical) | North Perry Post Office (historical) | Washington | Unknown | |
| Northfield Post Office (historical) | Northfield Post Office (historical) | Washington | Unknown | |
| Pembroke Post Office | Pembroke Post Office | Washington | Unknown | |
| Perry Post Office | Perry Post Office | Washington | Unknown | |
| Pike Post Office (historical) | Pike Post Office (historical) | Washington | Unknown | |
| Pines Post Office (historical) | Pines Post Office (historical) | Washington | Unknown | |
| Plantation Number Fourteen Post Office (historical) | Plantation Number Fourteen Post Office (historical) | Washington | Unknown | |
| Pokey Post Office (historical) | Pokey Post Office (historical) | Washington | Unknown | |
| Princeton Post Office | Princeton Post Office | Washington | 203 | Princeton |
| Red Beach Post Office | Red Beach Post Office | Washington | Unknown | |
| Robbinston Post Office | Robbinston Post Office | Washington | Unknown | |
| Roque Bluffs Post Office | Roque Bluffs Post Office | Washington | Unknown | |
| Sealand Post Office (historical) | Sealand Post Office (historical) | Washington | Unknown | |
| Seaside Post Office (historical) | Seaside Post Office (historical) | Washington | Unknown | |
| Smithville Post Office (historical) | Smithville Post Office (historical) | Washington | Unknown | |
| South Addison Post Office (historical) | South Addison Post Office (historical) | Washington | Unknown | |
| South Beddington Post Office (historical) | South Beddington Post Office (historical) | Washington | Unknown | |
| South Charlotte Post Office (historical) | South Charlotte Post Office (historical) | Washington | Unknown | |
| South Lubec Post Office (historical) | South Lubec Post Office (historical) | Washington | Unknown | |
| South Princeton Post Office (historical) | South Princeton Post Office (historical) | Washington | Unknown | |
| South Robbinston Post Office (historical) | South Robbinston Post Office (historical) | Washington | Unknown | |
| Sprague Falls Post Office (historical) | Sprague Falls Post Office (historical) | Washington | Unknown | |
| Starboard Post Office | Starboard Post Office | Washington | Unknown | |
| Steuben Post Office | Steuben Post Office | Washington | Unknown | |
| Technology Post Office (historical) | Technology Post Office (historical) | Washington | Unknown | |
| Thurlow Post Office (historical) | Thurlow Post Office (historical) | Washington | Unknown | |
| Topsfield Post Office | Topsfield Post Office | Washington | Unknown | |
| Tunk Post Office (historical) | Tunk Post Office (historical) | Washington | Unknown | |
| Unionville Post Office | Unionville Post Office | Washington | Unknown | |
| Vanceboro Post Office (historical) | Vanceboro Post Office (historical) | Washington | 427 | Vanceboro |
| Waite Post Office | Waite Post Office | Washington | Unknown | |
| Wesley Post Office (historical) | Wesley Post Office (historical) | Washington | Unknown | |
| West Lubec Post Office (historical) | West Lubec Post Office (historical) | Washington | Unknown | |
| West Pembroke Post Office | West Pembroke Post Office | Washington | Unknown | |
| Westcogus Post Office (historical) | Westcogus Post Office (historical) | Washington | Unknown | |
| West Jonesport Post Office | West Jonesport Post Office | Washington | Unknown | |
| West Harrington Post Office (historical) | West Harrington Post Office (historical) | Washington | Unknown | |
| Whiting Post Office | Whiting Post Office | Washington | Unknown | |
| Whitneyville Post Office | Whitneyville Post Office | Washington | Unknown | |
| Appleton Post Office | Appleton Post Office | Knox | Unknown | |
| Ashpoint Post Office | Ashpoint Post Office | Knox | Unknown | |
| Burkettville Post Office | Burkettville Post Office | Knox | Unknown | |
| Camden Post Office | Camden Post Office | Knox | 33 | Camden |
| Clark Island Post Office (historical) | Clark Island Post Office (historical) | Knox | Unknown | |
| Criehaven Post Office (historical) | Criehaven Post Office (historical) | Knox | Unknown | |
| Friendship Post Office (historical) | Friendship Post Office (historical) | Knox | Unknown | |
| Glen Cove Post Office (historical) | Glen Cove Post Office (historical) | Knox | Unknown | |
| Glenmere Post Office | Glenmere Post Office | Knox | Unknown | |
| Globe Post Office (historical) | Globe Post Office (historical) | Knox | Unknown | |
| Highland Post Office (historical) | Highland Post Office (historical) | Knox | Unknown | |
| Hope Post Office | Hope Post Office | Knox | Unknown | |
| Hurricane Island Post Office (historical) | Hurricane Island Post Office (historical) | Knox | Unknown | |
| Isle Au Haut Post Office | Isle Au Haut Post Office | Knox | Unknown | |
| Lawry Post Office | Lawry Post Office | Knox | Unknown | |
| Lond Cove Post Office (historical) | Lond Cove Post Office (historical) | Knox | Unknown | |
| Martin Post Office | Martin Post Office | Knox | Unknown | |
| Martinsville Post Office (historical) | Martinsville Post Office (historical) | Knox | Unknown | |
| Meduncook Post Office (historical) | Meduncook Post Office (historical) | Knox | Unknown | |
| North Appleton Post Office (historical) | North Appleton Post Office (historical) | Knox | Unknown | |
| North Cushing Post Office (historical) | North Cushing Post Office (historical) | Knox | Unknown | |
| North Haven Post Office | North Haven Post Office | Knox | Unknown | |
| North Hope Post Office (historical) | North Hope Post Office (historical) | Knox | Unknown | |
| North Union Post Office (historical) | North Union Post Office (historical) | Knox | Unknown | |
| North Warren Post Office (historical) | North Warren Post Office (historical) | Knox | Unknown | |
| North Washington Post Office (historical) | North Washington Post Office (historical) | Knox | Unknown | |
| Owls Head Post Office | Owls Head Post Office | Knox | Unknown | |
| Pleasant Point Post Office (historical) | Pleasant Point Post Office (historical) | Knox | Unknown | |
| Pleasantville Post Office (historical) | Pleasantville Post Office (historical) | Knox | Unknown | |
| Port Clyde Post Office | Port Clyde Post Office | Knox | Unknown | |
| Pulpit Harbor Post Office (historical) | Pulpit Harbor Post Office (historical) | Knox | Unknown | |
| Razorville Post Office (historical) | Razorville Post Office (historical) | Knox | Unknown | |
| Rockland Post Office | Rockland Post Office | Knox | 23 | Rockland |
| Rockport Post Office | Rockport Post Office | Knox | 125 | Camden |
| Rockville Post Office (historical) | Rockville Post Office (historical) | Knox | Unknown | |
| Saint George Post Office (historical) | Saint George Post Office (historical) | Knox | Unknown | |
| Simonton Post Office (historical) | Simonton Post Office (historical) | Knox | Unknown | |
| South Cushing Post Office | South Cushing Post Office | Knox | Unknown | |
| South Hope Post Office | South Hope Post Office | Knox | Unknown | |
| South Thomaston Post Office | South Thomaston Post Office | Knox | Unknown | |
| South Union Post Office | South Union Post Office | Knox | Unknown | |
| South Warren Post Office (historical) | South Warren Post Office (historical) | Knox | Unknown | |
| South Washington Post Office (historical) | South Washington Post Office (historical) | Knox | Unknown | |
| Spruce Head Post Office | Spruce Head Post Office | Knox | Unknown | |
| Stickney Corner Post Office (historical) | Stickney Corner Post Office (historical) | Knox | Unknown | |
| Tenants Harbor Post Office | Tenants Harbor Post Office | Knox | Unknown | |
| Thomaston Post Office | Thomaston Post Office | Knox | Unknown | |
| Union Post Office | Union Post Office | Knox | Unknown | |
| Vinalhaven Post Office | Vinalhaven Post Office | Knox | Unknown | |
| Warren Post Office (historical) | Warren Post Office (historical) | Knox | Unknown | |
| Washington Post Office | Washington Post Office | Knox | Unknown | |
| West Warren Post Office (historical) | West Warren Post Office (historical) | Knox | Unknown | |
| West Washington Post Office | West Washington Post Office | Knox | Unknown | |
| Matinicus Post Office | Matinicus Post Office | Knox | 0 | Matinicus OE W |
| Alna Post Office | Alna Post Office | Lincoln | Unknown | |
| Backriver Post Office (historical) | Backriver Post Office (historical) | Lincoln | Unknown | |
| Barters Island Post Office (historical) | Barters Island Post Office (historical) | Lincoln | Unknown | |
| Bayville Post Office | Bayville Post Office | Lincoln | Unknown | |
| Benner Post Office (historical) | Benner Post Office (historical) | Lincoln | Unknown | |
| Biscay Post Office (historical) | Biscay Post Office (historical) | Lincoln | Unknown | |
| Boothbay Centre Post Office (historical) | Boothbay Centre Post Office (historical) | Lincoln | Unknown | |
| Boothbay Harbor Post Office | Boothbay Harbor Post Office | Lincoln | 43 | Boothbay Harbor |
| Boothbay Post Office | Boothbay Post Office | Lincoln | 125 | Westport |
| Bremen Post Office (historical) | Bremen Post Office (historical) | Lincoln | Unknown | |
| Bristol Mills Post Office (historical) | Bristol Mills Post Office (historical) | Lincoln | Unknown | |
| Bristol Post Office | Bristol Post Office | Lincoln | Unknown | |
| Broad Bay Post Office (historical) | Broad Bay Post Office (historical) | Lincoln | Unknown | |
| Broad Cove Post Office (historical) | Broad Cove Post Office (historical) | Lincoln | Unknown | |
| Bunkerhill Post Office (historical) | Bunkerhill Post Office (historical) | Lincoln | Unknown | |
| Capitol Island Post Office | Capitol Island Post Office | Lincoln | Unknown | |
| Cedar Grove Post Office | Cedar Grove Post Office | Lincoln | Unknown | |
| Chamberlain Post Office | Chamberlain Post Office | Lincoln | Unknown | |
| Christmas Cove Post Office | Christmas Cove Post Office | Lincoln | Unknown | |
| Coopers Mills Post Office (historical) | Coopers Mills Post Office (historical) | Lincoln | Unknown | |
| Damariscotta Mills Post Office | Damariscotta Mills Post Office | Lincoln | Unknown | |
| Damariscotta Post Office | Damariscotta Post Office | Lincoln | Unknown | |
| Dresden Mills Post Office | Dresden Mills Post Office | Lincoln | Unknown | |
| Dresden Post Office (historical) | Dresden Post Office (historical) | Lincoln | Unknown | |
| Dyers Post Office (historical) | Dyers Post Office (historical) | Lincoln | Unknown | |
| Dyers River Post Office (historical) | Dyers River Post Office (historical) | Lincoln | Unknown | |
| East Alna Post Office (historical) | East Alna Post Office (historical) | Lincoln | Unknown | |
| East Boothbay Post Office | East Boothbay Post Office | Lincoln | 75 | Pemaquid Point |
| East Edgecomb Post Office (historical) | East Edgecomb Post Office (historical) | Lincoln | Unknown | |
| East Newcastle Post Office (historical) | East Newcastle Post Office (historical) | Lincoln | Unknown | |
| Edgecomb Post Office (historical) | Edgecomb Post Office (historical) | Lincoln | Unknown | |
| Feylers Corner Post Office (historical) | Feylers Corner Post Office (historical) | Lincoln | Unknown | |
| Fishlake Post Office (historical) | Fishlake Post Office (historical) | Lincoln | Unknown | |
| Glendon Post Office (historical) | Glendon Post Office (historical) | Lincoln | Unknown | |
| Headtide Post Office | Headtide Post Office | Lincoln | Unknown | |
| Heron Island Post Office | Heron Island Post Office | Lincoln | Unknown | |
| Isle of Springs Post Office (historical) | Isle of Springs Post Office (historical) | Lincoln | Unknown | |
| Jefferson Post Office (historical) | Jefferson Post Office (historical) | Lincoln | Unknown | |
| Joice Post Office (historical) | Joice Post Office (historical) | Lincoln | Unknown | |
| Kings Mills Post Office (historical) | Kings Mills Post Office (historical) | Lincoln | Unknown | |
| Lincoln Post Office (historical) | Lincoln Post Office (historical) | Lincoln | Unknown | |
| Linekin Post Office (historical) | Linekin Post Office (historical) | Lincoln | Unknown | |
| Linwood Post Office (historical) | Linwood Post Office (historical) | Lincoln | Unknown | |
| Loudville Post Office | Loudville Post Office | Lincoln | Unknown | |
| Medomak Post Office | Medomak Post Office | Lincoln | Unknown | |
| Monhegan Island Post Office (historical) | Monhegan Island Post Office (historical) | Lincoln | Unknown | |
| Monhegan Post Office | Monhegan Post Office | Lincoln | Unknown | |
| Mouse Island Post Office (historical) | Mouse Island Post Office (historical) | Lincoln | Unknown | |
| Muscongus Post Office (historical) | Muscongus Post Office (historical) | Lincoln | Unknown | |
| New Harbor Post Office | New Harbor Post Office | Lincoln | Unknown | |
| Newagen Post Office | Newagen Post Office | Lincoln | 20 | Boothbay Harbor |
| Newcastle Post Office | Newcastle Post Office | Lincoln | Unknown | |
| Nobleboro Post Office | Nobleboro Post Office | Lincoln | Unknown | |
| North Edgecomb Post Office | North Edgecomb Post Office | Lincoln | Unknown | |
| North Jefferson Post Office (historical) | North Jefferson Post Office (historical) | Lincoln | Unknown | |
| North Newcastle Post Office | North Newcastle Post Office | Lincoln | Unknown | |
| North Nobleboro Post Office (historical) | North Nobleboro Post Office (historical) | Lincoln | Unknown | |
| North Waldoboro Post Office | North Waldoboro Post Office | Lincoln | Unknown | |
| North Whitefield Post Office | North Whitefield Post Office | Lincoln | Unknown | |
| Ocean Point Post Office (historical) | Ocean Point Post Office (historical) | Lincoln | Unknown | |
| Orffs Corner Post Office (historical) | Orffs Corner Post Office (historical) | Lincoln | Unknown | |
| Pemaquid Beach Post Office | Pemaquid Beach Post Office | Lincoln | Unknown | |
| Pemaquid Harbor Post Office | Pemaquid Harbor Post Office | Lincoln | Unknown | |
| Pemaquid Point Post Office | Pemaquid Point Post Office | Lincoln | Unknown | |
| Pemaquid Post Office | Pemaquid Post Office | Lincoln | Unknown | |
| Pleasant Pond Post Office (historical) | Pleasant Pond Post Office (historical) | Lincoln | Unknown | |
| Round Pond Post Office | Round Pond Post Office | Lincoln | Unknown | |
| Sawyers Post Office (historical) | Sawyers Post Office (historical) | Lincoln | Unknown | |
| Sheepscott Post Office | Sheepscott Post Office | Lincoln | Unknown | |
| South Bristol Post Office (historical) | South Bristol Post Office (historical) | Lincoln | Unknown | |
| South Dresden Post Office (historical) | South Dresden Post Office (historical) | Lincoln | Unknown | |
| South Jefferson Post Office (historical) | South Jefferson Post Office (historical) | Lincoln | Unknown | |
| South Newcastle Post Office (historical) | South Newcastle Post Office (historical) | Lincoln | Unknown | |
| South Somerville Post Office (historical) | South Somerville Post Office (historical) | Lincoln | Unknown | |
| South Waldoboro Post Office (historical) | South Waldoboro Post Office (historical) | Lincoln | Unknown | |
| Southport Post Office | Southport Post Office | Lincoln | Unknown | |
| Somerville Post Office (historical) | Somerville Post Office (historical) | Lincoln | Unknown | |
| Squirrel Island Post Office | Squirrel Island Post Office | Lincoln | Unknown | |
| Trevettt Post Office (historical) | Trevettt Post Office (historical) | Lincoln | Unknown | |
| Waldoboro Post Office | Waldoboro Post Office | Lincoln | Unknown | |
| Walpole Post Office (historical) | Walpole Post Office (historical) | Lincoln | Unknown | |
| West Boothbay Harbor Post Office (historical) | West Boothbay Harbor Post Office (historical) | Lincoln | 13 | Boothbay Harbor |
| West Bristol Post Office (historical) | West Bristol Post Office (historical) | Lincoln | Unknown | |
| West Dresden Post Office (historical) | West Dresden Post Office (historical) | Lincoln | Unknown | |
| West Jefferson Post Office (historical) | West Jefferson Post Office (historical) | Lincoln | Unknown | |
| West Southport Post Office | West Southport Post Office | Lincoln | 69 | Boothbay Harbor |
| West Waldoboro Post Office (historical) | West Waldoboro Post Office (historical) | Lincoln | Unknown | |
| Westport Post Office (historical) | Westport Post Office (historical) | Lincoln | Unknown | |
| Whitefield Post Office | Whitefield Post Office | Lincoln | 92 | East Pittston |
| Winslows Mills Post Office | Winslows Mills Post Office | Lincoln | Unknown | |
| Wiscasset Post Office (historical) | Wiscasset Post Office (historical) | Lincoln | 66 | Wiscasset |
| Abbot Post Office (historical) | Abbot Post Office (historical) | Piscataquis | Unknown | |
| Abbot Village Post Office | Abbot Village Post Office | Piscataquis | Unknown | |
| Atkinson Post Office (historical) | Atkinson Post Office (historical) | Piscataquis | Unknown | |
| Barnard Post Office (historical) | Barnard Post Office (historical) | Piscataquis | Unknown | |
| Blanchard Post Office | Blanchard Post Office | Piscataquis | Unknown | |
| Borestone Post Office (historical) | Borestone Post Office (historical) | Piscataquis | Unknown | |
| Bowerbank Post Office | Bowerbank Post Office | Piscataquis | Unknown | |
| Boyd Lake Post Office (historical) | Boyd Lake Post Office (historical) | Piscataquis | Unknown | |
| Brockways Mills Post Office (historical) | Brockways Mills Post Office (historical) | Piscataquis | Unknown | |
| Brownville Junction Post Office | Brownville Junction Post Office | Piscataquis | 381 | Brownville Junction |
| Brownville Post Office | Brownville Post Office | Piscataquis | 361 | Brownville Junction |
| Burdin Post Office (historical) | Burdin Post Office (historical) | Piscataquis | Unknown | |
| Capens Post Office | Capens Post Office | Piscataquis | Unknown | |
| Center Guilford Post Office (historical) | Center Guilford Post Office (historical) | Piscataquis | Unknown | |
| Chandler Post Office (historical) | Chandler Post Office (historical) | Piscataquis | Unknown | |
| Chesuncook Post Office | Chesuncook Post Office | Piscataquis | Unknown | |
| Cole Post Office (historical) | Cole Post Office (historical) | Piscataquis | Unknown | |
| Debsconeag Post Office (historical) | Debsconeag Post Office (historical) | Piscataquis | Unknown | |
| Derby Post Office | Derby Post Office | Piscataquis | Unknown | |
| Dover South Mills Post Office (historical) | Dover South Mills Post Office (historical) | Piscataquis | Unknown | |
| Dover-Foxcroft Menick Square Station Post Office | Dover-Foxcroft Menick Square Station Post Office | Piscataquis | Unknown | |
| Dover-Foxcroft Post Office | Dover-Foxcroft Post Office | Piscataquis | Unknown | |
| East Dover Post Office | East Dover Post Office | Piscataquis | Unknown | |
| East Milo Post Office (historical) | East Milo Post Office (historical) | Piscataquis | Unknown | |
| East Sangerville Post Office (historical) | East Sangerville Post Office (historical) | Piscataquis | Unknown | |
| Ebeemee Post Office (historical) | Ebeemee Post Office (historical) | Piscataquis | Unknown | |
| Elliottsville Post Office (historical) | Elliottsville Post Office (historical) | Piscataquis | Unknown | |
| Gilman Post Office (historical) | Gilman Post Office (historical) | Piscataquis | Unknown | |
| Grant Farm Post Office (historical) | Grant Farm Post Office (historical) | Piscataquis | Unknown | |
| Greeley Post Office (historical) | Greeley Post Office (historical) | Piscataquis | Unknown | |
| Greenville Junction Post Office | Greenville Junction Post Office | Piscataquis | 1063 | Greenville |
| Greenville Post Office (historical) | Greenville Post Office (historical) | Piscataquis | 1040 | Greenville |
| Guilford Post Office | Guilford Post Office | Piscataquis | Unknown | |
| Haymock Post Office (historical) | Haymock Post Office (historical) | Piscataquis | Unknown | |
| Howard Post Office (historical) | Howard Post Office (historical) | Piscataquis | Unknown | |
| Katahdin Iron Works Post Office (historical) | Katahdin Iron Works Post Office (historical) | Piscataquis | Unknown | |
| Kidney Pond Post Office (historical) | Kidney Pond Post Office (historical) | Piscataquis | Unknown | |
| Kineo Post Office (historical) | Kineo Post Office (historical) | Piscataquis | Unknown | |
| Kingsbury Post Office | Kingsbury Post Office | Piscataquis | Unknown | |
| Kokadjo Post Office (historical) | Kokadjo Post Office (historical) | Piscataquis | Unknown | |
| Lake View Post Office (historical) | Lake View Post Office (historical) | Piscataquis | Unknown | |
| Lily Bay Post Office (historical) | Lily Bay Post Office (historical) | Piscataquis | Unknown | |
| Maple Post Office (historical) | Maple Post Office (historical) | Piscataquis | Unknown | |
| Medford Center Post Office (historical) | Medford Center Post Office (historical) | Piscataquis | Unknown | |
| Medford Post Office | Medford Post Office | Piscataquis | Unknown | |
| Medford Post Office (historical) | Medford Post Office (historical) | Piscataquis | Unknown | |
| Milo Junction Post Office (historical) | Milo Junction Post Office (historical) | Piscataquis | Unknown | |
| Milo Post Office | Milo Post Office | Piscataquis | 341 | Milo North |
| Milton Post Office (historical) | Milton Post Office (historical) | Piscataquis | Unknown | |
| Monson Post Office | Monson Post Office | Piscataquis | Unknown | |
| Moosehead Post Office (historical) | Moosehead Post Office (historical) | Piscataquis | Unknown | |
| Mount Kineo Post Office (historical) | Mount Kineo Post Office (historical) | Piscataquis | Unknown | |
| North Atkinson Post Office (historical) | North Atkinson Post Office (historical) | Piscataquis | Unknown | |
| North Blanchard Post Office (historical) | North Blanchard Post Office (historical) | Piscataquis | Unknown | |
| North Brownville Post Office (historical) | North Brownville Post Office (historical) | Piscataquis | Unknown | |
| North Guilford Post Office (historical) | North Guilford Post Office (historical) | Piscataquis | Unknown | |
| Northeast Carry Post Office | Northeast Carry Post Office | Piscataquis | Unknown | |
| Norton Post Office (historical) | Norton Post Office (historical) | Piscataquis | Unknown | |
| Oakdale Post Office (historical) | Oakdale Post Office (historical) | Piscataquis | Unknown | |
| Onawa Post Office | Onawa Post Office | Piscataquis | Unknown | |
| Orneville Post Office (historical) | Orneville Post Office (historical) | Piscataquis | Unknown | |
| Parkman Centre Post Office (historical) | Parkman Centre Post Office (historical) | Piscataquis | Unknown | |
| Parkman Post Office (historical) | Parkman Post Office (historical) | Piscataquis | Unknown | |
| Rand Cove Post Office (historical) | Rand Cove Post Office (historical) | Piscataquis | Unknown | |
| Ray Post Office (historical) | Ray Post Office (historical) | Piscataquis | Unknown | |
| Sangerville Post Office (historical) | Sangerville Post Office (historical) | Piscataquis | Unknown | |
| Schoodic Post Office (historical) | Schoodic Post Office (historical) | Piscataquis | Unknown | |
| Sebec Lake Post Office (historical) | Sebec Lake Post Office (historical) | Piscataquis | Unknown | |
| Sebec Post Office | Sebec Post Office | Piscataquis | Unknown | |
| Sebec Station Post Office (historical) | Sebec Station Post Office (historical) | Piscataquis | Unknown | |
| Shirley Mills Post Office | Shirley Mills Post Office | Piscataquis | Unknown | |
| South Atkinson Post Office (historical) | South Atkinson Post Office (historical) | Piscataquis | Unknown | |
| South Dover Post Office (historical) | South Dover Post Office (historical) | Piscataquis | Unknown | |
| South Parkman Post Office (historical) | South Parkman Post Office (historical) | Piscataquis | Unknown | |
| South Sangerville Post Office (historical) | South Sangerville Post Office (historical) | Piscataquis | Unknown | |
| South Sebec Post Office (historical) | South Sebec Post Office (historical) | Piscataquis | Unknown | |
| Sugar Island Post Office (historical) | Sugar Island Post Office (historical) | Piscataquis | Unknown | |
| Summit Post Office (historical) | Summit Post Office (historical) | Piscataquis | Unknown | |
| Thorofare Post Office (historical) | Thorofare Post Office (historical) | Piscataquis | Unknown | |
| Wellington Post Office | Wellington Post Office | Piscataquis | 574 | Wellington |
| West Dover Post Office (historical) | West Dover Post Office (historical) | Piscataquis | Unknown | |
| Williamsburg Post Office (historical) | Williamsburg Post Office (historical) | Piscataquis | Unknown | |
| Willimantic Post Office (historical) | Willimantic Post Office (historical) | Piscataquis | Unknown | |
| Acadia Post Office (historical) | Acadia Post Office (historical) | Aroostook | Unknown | |
| Allagash Post Office (historical) | Allagash Post Office (historical) | Aroostook | Unknown | |
| Amity Post Office (historical) | Amity Post Office (historical) | Aroostook | Unknown | |
| Army Air Field Post Office | Army Air Field Post Office | Aroostook | Unknown | |
| Ashland Post Office | Ashland Post Office | Aroostook | Unknown | |
| Bancroft Mills Post Office (historical) | Bancroft Mills Post Office (historical) | Aroostook | Unknown | |
| Bathurst Post Office (historical) | Bathurst Post Office (historical) | Aroostook | Unknown | |
| Benedicta Post Office | Benedicta Post Office | Aroostook | Unknown | |
| Blaine Post Office | Blaine Post Office | Aroostook | Unknown | |
| Bouchard Post Office (historical) | Bouchard Post Office (historical) | Aroostook | Unknown | |
| Boundary Post Office (historical) | Boundary Post Office (historical) | Aroostook | Unknown | |
| Bridgewater Post Office (historical) | Bridgewater Post Office (historical) | Aroostook | Unknown | |
| Bradbury Post Office (historical) | Bradbury Post Office (historical) | Aroostook | Unknown | |
| Burleigh Post Office (historical) | Burleigh Post Office (historical) | Aroostook | Unknown | |
| Caribou Post Office | Caribou Post Office | Aroostook | 440 | Caribou |
| Carson Post Office (historical) | Carson Post Office (historical) | Aroostook | Unknown | |
| Cary Post Office (historical) | Cary Post Office (historical) | Aroostook | Unknown | |
| Castle Hill Post Office (historical) | Castle Hill Post Office (historical) | Aroostook | Unknown | |
| Caswell Post Office (historical) | Caswell Post Office (historical) | Aroostook | Unknown | |
| Chapman Post Office (historical) | Chapman Post Office (historical) | Aroostook | Unknown | |
| Clayton Lake Post Office | Clayton Lake Post Office | Aroostook | 1040 | Clayton Lake |
| Cleveland Post Office (historical) | Cleveland Post Office (historical) | Aroostook | Unknown | |
| Clyde Post Office (historical) | Clyde Post Office (historical) | Aroostook | Unknown | |
| Colbath Post Office (historical) | Colbath Post Office (historical) | Aroostook | Unknown | |
| College Grant Post Office (historical) | College Grant Post Office (historical) | Aroostook | Unknown | |
| Conner Post Office (historical) | Conner Post Office (historical) | Aroostook | Unknown | |
| Coral Post Office (historical) | Coral Post Office (historical) | Aroostook | Unknown | |
| Crouseville Post Office | Crouseville Post Office | Aroostook | Unknown | |
| Crystal Post Office (historical) | Crystal Post Office (historical) | Aroostook | Unknown | |
| Daigle Post Office (historical) | Daigle Post Office (historical) | Aroostook | Unknown | |
| Dickey Post Office (historical) | Dickey Post Office (historical) | Aroostook | Unknown | |
| Dyerbrook Post Office (historical) | Dyerbrook Post Office (historical) | Aroostook | Unknown | |
| Eagle Lake Mills Post Office (historical) | Eagle Lake Mills Post Office (historical) | Aroostook | Unknown | |
| Eagle Lake Post Office | Eagle Lake Post Office | Aroostook | 801 | Eagle Lake |
| East Caribou Post Office (historical) | East Caribou Post Office (historical) | Aroostook | Unknown | |
| East Maysville Post Office (historical) | East Maysville Post Office (historical) | Aroostook | Unknown | |
| East Perham Post Office | East Perham Post Office | Aroostook | Unknown | |
| East Sherman Post Office (historical) | East Sherman Post Office (historical) | Aroostook | Unknown | |
| East Washburn Post Office (historical) | East Washburn Post Office (historical) | Aroostook | Unknown | |
| Easton Post Office | Easton Post Office | Aroostook | Unknown | |
| Eaton Grant Post Office (historical) | Eaton Grant Post Office (historical) | Aroostook | Unknown | |
| Fort Fairfield Post Office | Fort Fairfield Post Office | Aroostook | 367 | Fort Fairfield |
| Fort Kent Mills Post Office | Fort Kent Mills Post Office | Aroostook | Unknown | |
| Fort Kent Post Office (historical) | Fort Kent Post Office (historical) | Aroostook | 518 | Fort Kent South |
| Fremont Post Office (historical) | Fremont Post Office (historical) | Aroostook | Unknown | |
| Frenchville Post Office | Frenchville Post Office | Aroostook | 505 | Frenchville |
| Glenwood Post Office (historical) | Glenwood Post Office (historical) | Aroostook | Unknown | |
| Goldenridge Post Office (historical) | Goldenridge Post Office (historical) | Aroostook | Unknown | |
| Goodrich Post Office (historical) | Goodrich Post Office (historical) | Aroostook | Unknown | |
| Grand Isle Post Office | Grand Isle Post Office | Aroostook | 499 | Grand Isle |
| Grimes Post Office (historical) | Grimes Post Office (historical) | Aroostook | Unknown | |
| Griswold Post Office (historical) | Griswold Post Office (historical) | Aroostook | Unknown | |
| Guerette Post Office | Guerette Post Office | Aroostook | Unknown | |
| Hamlin Post Office (historical) | Hamlin Post Office (historical) | Aroostook | Unknown | |
| Harvey Post Office (historical) | Harvey Post Office (historical) | Aroostook | Unknown | |
| Haywood Post Office (historical) | Haywood Post Office (historical) | Aroostook | Unknown | |
| Hersey Post Office (historical) | Hersey Post Office (historical) | Aroostook | Unknown | |
| Hillman Post Office (historical) | Hillman Post Office (historical) | Aroostook | Unknown | |
| Hodgdon Post Office | Hodgdon Post Office | Aroostook | Unknown | |
| Houlton Post Office | Houlton Post Office | Aroostook | 358 | Houlton South |
| Howe Brook Post Office (historical) | Howe Brook Post Office (historical) | Aroostook | Unknown | |
| Island Falls Post Office | Island Falls Post Office | Aroostook | 469 | Island Falls |
| Jemtland Post Office (historical) | Jemtland Post Office (historical) | Aroostook | Unknown | |
| Jewell Post Office (historical) | Jewell Post Office (historical) | Aroostook | Unknown | |
| Keegan Post Office | Keegan Post Office | Aroostook | Unknown | |
| Lille Post Office (historical) | Lille Post Office (historical) | Aroostook | 486 | Lille |
| Limestone Post Office | Limestone Post Office | Aroostook | Unknown | |
| Limestone River Post Office (historical) | Limestone River Post Office (historical) | Aroostook | Unknown | |
| Linneus Post Office | Linneus Post Office | Aroostook | Unknown | |
| Littleton Post Office (historical) | Littleton Post Office (historical) | Aroostook | Unknown | |
| Logan Post Office (historical) | Logan Post Office (historical) | Aroostook | Unknown | |
| Lower Madawaska Post Office (historical) | Lower Madawaska Post Office (historical) | Aroostook | Unknown | |
| Ludlow Post Office | Ludlow Post Office | Aroostook | Unknown | |
| Lyndon Post Office (historical) | Lyndon Post Office (historical) | Aroostook | Unknown | |
| Macwahoc Post Office (historical) | Macwahoc Post Office (historical) | Aroostook | Unknown | |
| Madawaska Centre Post Office (historical) | Madawaska Centre Post Office (historical) | Aroostook | Unknown | |
| Madawaska Post Office | Madawaska Post Office | Aroostook | 518 | Madawaska |
| Maplegrove Post Office (historical) | Maplegrove Post Office (historical) | Aroostook | Unknown | |
| Mapleton Post Office | Mapleton Post Office | Aroostook | Unknown | |
| Mars Hill Post Office | Mars Hill Post Office | Aroostook | Unknown | |
| Masardis Post Office | Masardis Post Office | Aroostook | 561 | Scopan Lake West |
| Maysville Center Post Office (historical) | Maysville Center Post Office (historical) | Aroostook | Unknown | |
| Michaud Post Office (historical) | Michaud Post Office (historical) | Aroostook | Unknown | |
| Molunkus Post Office (historical) | Molunkus Post Office (historical) | Aroostook | Unknown | |
| Monarda Post Office | Monarda Post Office | Aroostook | Unknown | |
| Monticello Post Office | Monticello Post Office | Aroostook | Unknown | |
| Moro Post Office (historical) | Moro Post Office (historical) | Aroostook | Unknown | |
| Morris Post Office (historical) | Morris Post Office (historical) | Aroostook | Unknown | |
| Murray Post Office (historical) | Murray Post Office (historical) | Aroostook | Unknown | |
| Nelson Post Office (historical) | Nelson Post Office (historical) | Aroostook | Unknown | |
| New Limerick Post Office | New Limerick Post Office | Aroostook | Unknown | |
| New Sweden Post Office | New Sweden Post Office | Aroostook | Unknown | |
| North Amity Post Office | North Amity Post Office | Aroostook | Unknown | |
| North Bancroft Post Office | North Bancroft Post Office | Aroostook | Unknown | |
| North Linneus Post Office (historical) | North Linneus Post Office (historical) | Aroostook | Unknown | |
| North Lyndon Post Office (historical) | North Lyndon Post Office (historical) | Aroostook | Unknown | |
| North Perham Post Office (historical) | North Perham Post Office (historical) | Aroostook | Unknown | |
| Number Eleven Post Office (historical) | Number Eleven Post Office (historical) | Aroostook | Unknown | |
| Number One Post Office (historical) | Number One Post Office (historical) | Aroostook | Unknown | |
| Oakfield Post Office | Oakfield Post Office | Aroostook | Unknown | |
| Orient Post Office | Orient Post Office | Aroostook | Unknown | |
| Ouellette Post Office (historical) | Ouellette Post Office (historical) | Aroostook | Unknown | |
| Oxbow Post Office (historical) | Oxbow Post Office (historical) | Aroostook | Unknown | |
| Perham Post Office | Perham Post Office | Aroostook | Unknown | |
| Phair Post Office | Phair Post Office | Aroostook | Unknown | |
| Plaisted Post Office | Plaisted Post Office | Aroostook | 571 | Eagle Lake |
| Portage Post Office | Portage Post Office | Aroostook | 650 | Portage Lake East |
| Presque Isle Post Office | Presque Isle Post Office | Aroostook | 466 | Presque Isle |
| Quimby Post Office | Quimby Post Office | Aroostook | 646 | Winterville |
| Rawson Post Office (historical) | Rawson Post Office (historical) | Aroostook | Unknown | |
| Reed Plantation Post Office (historical) | Reed Plantation Post Office (historical) | Aroostook | Unknown | |
| Reynolds Post Office (historical) | Reynolds Post Office (historical) | Aroostook | Unknown | |
| Robie Post Office (historical) | Robie Post Office (historical) | Aroostook | Unknown | |
| Robinsons Post Office (historical) | Robinsons Post Office (historical) | Aroostook | Unknown | |
| Rockabema Post Office (historical) | Rockabema Post Office (historical) | Aroostook | Unknown | |
| Roxie Post Office (historical) | Roxie Post Office (historical) | Aroostook | Unknown | |
| Saint Agatha Post Office | Saint Agatha Post Office | Aroostook | 659 | Saint Agatha |
| Saint Croix Post Office (historical) | Saint Croix Post Office (historical) | Aroostook | Unknown | |
| Saint David Post Office (historical) | Saint David Post Office (historical) | Aroostook | Unknown | |
| Saint Francis Post Office | Saint Francis Post Office | Aroostook | Unknown | |
| Saint John Post Office (historical) | Saint John Post Office (historical) | Aroostook | Unknown | |
| Selden Post Office (historical) | Selden Post Office (historical) | Aroostook | Unknown | |
| Sheridan Post Office | Sheridan Post Office | Aroostook | 581 | Ashland |
| Sherman Mills Post Office (historical) | Sherman Mills Post Office (historical) | Aroostook | 459 | Benedicta |
| Sherman Post Office | Sherman Post Office | Aroostook | 502 | Monarda |
| Sinclair Post Office (historical) | Sinclair Post Office (historical) | Aroostook | 600 | Saint Agatha |
| Smyrna Mills Post Office | Smyrna Mills Post Office | Aroostook | Unknown | |
| Smyrna Post Office (historical) | Smyrna Post Office (historical) | Aroostook | Unknown | |
| Soldier Pond Post Office | Soldier Pond Post Office | Aroostook | 571 | Fort Kent South |
| South Bancroft Post Office | South Bancroft Post Office | Aroostook | Unknown | |
| South Hodgdon Post Office (historical) | South Hodgdon Post Office (historical) | Aroostook | Unknown | |
| South Linneus Post Office (historical) | South Linneus Post Office (historical) | Aroostook | Unknown | |
| South Moluncus Post Office (historical) | South Moluncus Post Office (historical) | Aroostook | Unknown | |
| South Presque Isle Post Office (historical) | South Presque Isle Post Office (historical) | Aroostook | Unknown | |
| South Weston Post Office (historical) | South Weston Post Office (historical) | Aroostook | Unknown | |
| Spaulding Post Office (historical) | Spaulding Post Office (historical) | Aroostook | Unknown | |
| Square Lake Post Office (historical) | Square Lake Post Office (historical) | Aroostook | Unknown | |
| Stockholm Post Office | Stockholm Post Office | Aroostook | 551 | Stockholm |
| Titcomb Post Office (historical) | Titcomb Post Office (historical) | Aroostook | Unknown | |
| Umcolcus Post Office (historical) | Umcolcus Post Office (historical) | Aroostook | Unknown | |
| Upper Frenchville Post Office | Upper Frenchville Post Office | Aroostook | 528 | Frenchville |
| Upper Van Buren Post Office (historical) | Upper Van Buren Post Office (historical) | Aroostook | Unknown | |
| Van Buren Post Office | Van Buren Post Office | Aroostook | 495 | Van Buren |
| Wallagrass Post Office (historical) | Wallagrass Post Office (historical) | Aroostook | Unknown | |
| Washburn Post Office | Washburn Post Office | Aroostook | Unknown | |
| Weeksboro Post Office (historical) | Weeksboro Post Office (historical) | Aroostook | Unknown | |
| West Houlton Post Office (historical) | West Houlton Post Office (historical) | Aroostook | Unknown | |
| West Madawaska Post Office (historical) | West Madawaska Post Office (historical) | Aroostook | Unknown | |
| Westfield Post Office | Westfield Post Office | Aroostook | Unknown | |
| Weston Post Office (historical) | Weston Post Office (historical) | Aroostook | Unknown | |
| Wheelock Post Office (historical) | Wheelock Post Office (historical) | Aroostook | Unknown | |
| Winterville Post Office (historical) | Winterville Post Office (historical) | Aroostook | 928 | Winterville |
| Wytopitlock Post Office | Wytopitlock Post Office | Aroostook | Unknown | |
| Dudley Post Office (historical) | Dudley Post Office (historical) | Aroostook | Unknown | |
| Acton Post Office (historical) | Acton Post Office (historical) | York | Unknown | |
| Alewive Post Office (historical) | Alewive Post Office (historical) | York | Unknown | |
| Alfred Post Office | Alfred Post Office | York | Unknown | |
| Bar Mills Post Office | Bar Mills Post Office | York | Unknown | |
| Bartletts Post Office (historical) | Bartletts Post Office (historical) | York | Unknown | |
| Bauneg-Beg Post Office (historical) | Bauneg-Beg Post Office (historical) | York | Unknown | |
| Bayview Post Office (historical) | Bayview Post Office (historical) | York | Unknown | |
| Beachwood Post Office (historical) | Beachwood Post Office (historical) | York | Unknown | |
| Berwick Branch Post Office (historical) | Berwick Branch Post Office (historical) | York | Unknown | |
| Biddeford Pool Post Office | Biddeford Pool Post Office | York | Unknown | |
| Biddeford Post Office | Biddeford Post Office | York | 79 | Biddeford |
| Blackberry Hill Post Office | Blackberry Hill Post Office | York | Unknown | |
| Brixham Post Office | Brixham Post Office | York | Unknown | |
| Buxton Center Post Office (historical) | Buxton Center Post Office (historical) | York | Unknown | |
| Buxton Post Office | Buxton Post Office | York | Unknown | |
| Cape Neddick Post Office | Cape Neddick Post Office | York | 39 | York Beach |
| Cape Porpoise Post Office | Cape Porpoise Post Office | York | Unknown | |
| Center Lebanon Post Office (historical) | Center Lebanon Post Office (historical) | York | Unknown | |
| Chicopee Post Office (historical) | Chicopee Post Office (historical) | York | Unknown | |
| Clarks Mill Post Office (historical) | Clarks Mill Post Office (historical) | York | Unknown | |
| Cornish Post Office | Cornish Post Office | York | Unknown | |
| Cornish Post Office (historical) | Cornish Post Office (historical) | York | Unknown | |
| East Parsonfield Post Office | East Parsonfield Post Office | York | Unknown | |
| East Waterboro Post Office (historical) | East Waterboro Post Office (historical) | York | Unknown | |
| Eliot Post Office (historical) | Eliot Post Office (historical) | York | Unknown | |
| Eliot Post Office | Eliot Post Office | York | 33 | Dover East |
| Elms Post Office (historical) | Elms Post Office (historical) | York | Unknown | |
| Emerys Mills Post Office | Emerys Mills Post Office | York | Unknown | |
| Foreside Post Office (historical) | Foreside Post Office (historical) | York | Unknown | |
| Fortune Rock Post Office (historical) | Fortune Rock Post Office (historical) | York | Unknown | |
| Goodwins Mills Post Office (historical) | Goodwins Mills Post Office (historical) | York | Unknown | |
| Gore Post Office (historical) | Gore Post Office (historical) | York | Unknown | |
| Groveville Post Office (historical) | Groveville Post Office (historical) | York | Unknown | |
| Haines Meadow Post Office (historical) | Haines Meadow Post Office (historical) | York | Unknown | |
| Highpine Post Office (historical) | Highpine Post Office (historical) | York | Unknown | |
| Hollis Center Post Office | Hollis Center Post Office | York | Unknown | |
| Hollis Post Office (historical) | Hollis Post Office (historical) | York | Unknown | |
| Kennebunk Beach Post Office (historical) | Kennebunk Beach Post Office (historical) | York | Unknown | |
| Kennebunk Landing Post Office (historical) | Kennebunk Landing Post Office (historical) | York | Unknown | |
| Kennebunk Port Post Office | Kennebunk Port Post Office | York | Unknown | |
| Kennebunk Post Office | Kennebunk Post Office | York | 56 | Kennebunk |
| Kennebunkport Post Office | Kennebunkport Post Office | York | 10 | Kennebunkport |
| Kezar Falls Post Office | Kezar Falls Post Office | York | Unknown | |
| Kittery Depot Post Office (historical) | Kittery Depot Post Office (historical) | York | Unknown | |
| Kittery Point Post Office | Kittery Point Post Office | York | Unknown | |
| Lebanon Post Office (historical) | Lebanon Post Office (historical) | York | Unknown | |
| Limerick Post Office | Limerick Post Office | York | Unknown | |
| Limington Post Office | Limington Post Office | York | Unknown | |
| Long Beach Post Office (historical) | Long Beach Post Office (historical) | York | Unknown | |
| Lyman Post Office (historical) | Lyman Post Office (historical) | York | Unknown | |
| Maplewood Post Office | Maplewood Post Office | York | Unknown | |
| Moody Post Office | Moody Post Office | York | Unknown | |
| Nasons Mills Post Office (historical) | Nasons Mills Post Office (historical) | York | Unknown | |
| North Acton Post Office (historical) | North Acton Post Office (historical) | York | Unknown | |
| North Alfred Post Office (historical) | North Alfred Post Office (historical) | York | Unknown | |
| North Berwick Post Office | North Berwick Post Office | York | Unknown | |
| North Buxton Post Office (historical) | North Buxton Post Office (historical) | York | Unknown | |
| North Hollis Post Office (historical) | North Hollis Post Office (historical) | York | Unknown | |
| North Kennebunk Post Office (historical) | North Kennebunk Post Office (historical) | York | Unknown | |
| North Kennebunkport Post Office (historical) | North Kennebunkport Post Office (historical) | York | Unknown | |
| North Lebanon Post Office (historical) | North Lebanon Post Office (historical) | York | Unknown | |
| North Limington Post Office (historical) | North Limington Post Office (historical) | York | Unknown | |
| North Parsonfield Post Office | North Parsonfield Post Office | York | Unknown | |
| North Shapleigh Post Office (historical) | North Shapleigh Post Office (historical) | York | Unknown | |
| North Waterboro Post Office | North Waterboro Post Office | York | Unknown | |
| Ocean Park Post Office | Ocean Park Post Office | York | Unknown | |
| Ogunquit Post Office | Ogunquit Post Office | York | 33 | York Beach |
| Old Orchard Beach Post Office | Old Orchard Beach Post Office | York | Unknown | |
| Ossipee Mills Post Office (historical) | Ossipee Mills Post Office (historical) | York | Unknown | |
| Parsonfield Post Office | Parsonfield Post Office | York | Unknown | |
| Rapids Post Office (historical) | Rapids Post Office (historical) | York | Unknown | |
| Ross Corners Post Office (historical) | Ross Corners Post Office (historical) | York | Unknown | |
| Saco Post Office | Saco Post Office | York | Unknown | |
| Sanford Post Office (historical) | Sanford Post Office (historical) | York | 308 | Sanford |
| Scotland Post Office (historical) | Scotland Post Office (historical) | York | Unknown | |
| Shapleigh Post Office (historical) | Shapleigh Post Office (historical) | York | Unknown | |
| South Acton Post Office | South Acton Post Office | York | Unknown | |
| South Berwick Post Office | South Berwick Post Office | York | Unknown | |
| South Buxton Post Office (historical) | South Buxton Post Office (historical) | York | Unknown | |
| South Hollis Post Office (historical) | South Hollis Post Office (historical) | York | Unknown | |
| South Limington Post Office (historical) | South Limington Post Office (historical) | York | Unknown | |
| South Parsonfield Post Office (historical) | South Parsonfield Post Office (historical) | York | Unknown | |
| South Sanford Post Office (historical) | South Sanford Post Office (historical) | York | Unknown | |
| Springvale Post Office | Springvale Post Office | York | 344 | Sanford |
| Union Bluff Post Office (historical) | Union Bluff Post Office (historical) | York | Unknown | |
| Waterboro Center Post Office (historical) | Waterboro Center Post Office (historical) | York | Unknown | |
| Waterboro Post Office | Waterboro Post Office | York | Unknown | |
| Webhannet Post Office (historical) | Webhannet Post Office (historical) | York | Unknown | |
| Wells Branch Post Office (historical) | Wells Branch Post Office (historical) | York | Unknown | |
| Wells Post Office | Wells Post Office | York | Unknown | |
| West Buxton Post Office | West Buxton Post Office | York | Unknown | |
| West Hollis Post Office (historical) | West Hollis Post Office (historical) | York | Unknown | |
| West Kennebunk Post Office | West Kennebunk Post Office | York | Unknown | |
| West Lebanon Post Office (historical) | West Lebanon Post Office (historical) | York | Unknown | |
| West Limington Post Office (historical) | West Limington Post Office (historical) | York | Unknown | |
| West Newfield Post Office | West Newfield Post Office | York | Unknown | |
| West Parsonfield Post Office (historical) | West Parsonfield Post Office (historical) | York | Unknown | |
| York Beach Post Office | York Beach Post Office | York | Unknown | |
| York Cliffs Post Office (historical) | York Cliffs Post Office (historical) | York | Unknown | |
| York Corner Post Office (historical) | York Corner Post Office (historical) | York | Unknown | |
| York Harbor Post Office | York Harbor Post Office | York | 43 | York Harbor |
| York Village Post Office | York Village Post Office | York | 66 | York Harbor |
| Appledore Post Office (historical) | Appledore Post Office (historical) | York | Unknown | |
| Amherst Post Office | Amherst Post Office | Hancock | Unknown | |
| Ashville Post Office | Ashville Post Office | Hancock | Unknown | |
| Asticou Post Office (historical) | Asticou Post Office (historical) | Hancock | Unknown | |
| Atlantic Post Office | Atlantic Post Office | Hancock | Unknown | |
| Aurora Post Office | Aurora Post Office | Hancock | 331 | Amherst |
| Bar Harbor Post Office | Bar Harbor Post Office | Hancock | 43 | Bar Harbor |
| Bass Harbor Post Office | Bass Harbor Post Office | Hancock | 36 | Bass Harbor |
| Bayside Post Office (historical) | Bayside Post Office (historical) | Hancock | Unknown | |
| Bernard Post Office | Bernard Post Office | Hancock | 36 | Bass Harbor |
| Birch Harbor Post Office | Birch Harbor Post Office | Hancock | Unknown | |
| Bluehill Falls Post Office | Bluehill Falls Post Office | Hancock | Unknown | |
| Bluehill Post Office | Bluehill Post Office | Hancock | Unknown | |
| Brooklin Post Office | Brooklin Post Office | Hancock | Unknown | |
| Brooksville Post Office | Brooksville Post Office | Hancock | Unknown | |
| Bucks Mills Post Office (historical) | Bucks Mills Post Office (historical) | Hancock | Unknown | |
| Bucksport Center Post Office (historical) | Bucksport Center Post Office (historical) | Hancock | Unknown | |
| Bucksport Post Office | Bucksport Post Office | Hancock | Unknown | |
| Cape Rosier Post Office | Cape Rosier Post Office | Hancock | Unknown | |
| Castine Post Office | Castine Post Office | Hancock | Unknown | |
| Center Post Office (historical) | Center Post Office (historical) | Hancock | Unknown | |
| Corea Post Office | Corea Post Office | Hancock | 30 | Petit Manan Point |
| Cranberry Island Post Office | Cranberry Island Post Office | Hancock | 13 | Southwest Harbor |
| Cranberry Isles Post Office | Cranberry Isles Post Office | Hancock | Unknown | |
| Crosby Post Office (historical) | Crosby Post Office (historical) | Hancock | Unknown | |
| Dedham Post Office (historical) | Dedham Post Office (historical) | Hancock | Unknown | |
| Deer Isle Post Office | Deer Isle Post Office | Hancock | Unknown | |
| Dirigo Island Post Office (historical) | Dirigo Island Post Office (historical) | Hancock | Unknown | |
| Dirigo Post Office (historical) | Dirigo Post Office (historical) | Hancock | Unknown | |
| Eagle Post Office | Eagle Post Office | Hancock | Unknown | |
| East Bluehill Post Office | East Bluehill Post Office | Hancock | Unknown | |
| East Bucksport Post Office (historical) | East Bucksport Post Office (historical) | Hancock | Unknown | |
| East Dedham Post Office (historical) | East Dedham Post Office (historical) | Hancock | Unknown | |
| East Orland Post Office | East Orland Post Office | Hancock | Unknown | |
| East Sullivan Post Office | East Sullivan Post Office | Hancock | Unknown | |
| East Surry Post Office (historical) | East Surry Post Office (historical) | Hancock | Unknown | |
| East Trenton Post Office (historical) | East Trenton Post Office (historical) | Hancock | Unknown | |
| Eastbrook Post Office (historical) | Eastbrook Post Office (historical) | Hancock | Unknown | |
| Eden Post Office (historical) | Eden Post Office (historical) | Hancock | Unknown | |
| Eggemoggin Post Office (historical) | Eggemoggin Post Office (historical) | Hancock | Unknown | |
| Egypt Post Office (historical) | Egypt Post Office (historical) | Hancock | Unknown | |
| Ellsworth Falls Post Office | Ellsworth Falls Post Office | Hancock | Unknown | |
| Ellsworth Post Office | Ellsworth Post Office | Hancock | 66 | Ellsworth |
| Flye Point Post Office (historical) | Flye Point Post Office (historical) | Hancock | Unknown | |
| Franklin Post Office | Franklin Post Office | Hancock | Unknown | |
| Franklin Road Post Office (historical) | Franklin Road Post Office (historical) | Hancock | Unknown | |
| Frenchboro Post Office | Frenchboro Post Office | Hancock | Unknown | |
| Goose Cove Post Office (historical) | Goose Cove Post Office (historical) | Hancock | Unknown | |
| Gotts Island Post Office (historical) | Gotts Island Post Office (historical) | Hancock | Unknown | |
| Gouldsboro Post Office | Gouldsboro Post Office | Hancock | Unknown | |
| Granite Post Office (historical) | Granite Post Office (historical) | Hancock | Unknown | |
| Great Pond Post Office | Great Pond Post Office | Hancock | Unknown | |
| Green Lake Post Office | Green Lake Post Office | Hancock | Unknown | |
| Hall Quarry Post Office | Hall Quarry Post Office | Hancock | Unknown | |
| Hancock Point Post Office (historical) | Hancock Point Post Office (historical) | Hancock | Unknown | |
| Hancock Post Office (historical) | Hancock Post Office (historical) | Hancock | Unknown | |
| Harborside Post Office | Harborside Post Office | Hancock | Unknown | |
| Haven Post Office (historical) | Haven Post Office (historical) | Hancock | Unknown | |
| Herricks Post Office (historical) | Herricks Post Office (historical) | Hancock | Unknown | |
| Hulls Cove Post Office | Hulls Cove Post Office | Hancock | 16 | Salsbury Cove |
| Indian Point Post Office (historical) | Indian Point Post Office (historical) | Hancock | Unknown | |
| Islesford Post Office | Islesford Post Office | Hancock | 49 | Seal Harbor |
| Lakewood Post Office (historical) | Lakewood Post Office (historical) | Hancock | Unknown | |
| Lamoine Beach Post Office (historical) | Lamoine Beach Post Office (historical) | Hancock | Unknown | |
| Lamoine Post Office (historical) | Lamoine Post Office (historical) | Hancock | Unknown | |
| Little Deer Isle Post Office | Little Deer Isle Post Office | Hancock | Unknown | |
| Long Pond Post Office | Long Pond Post Office | Hancock | 30 | Southwest Harbor |
| Lucerne-In-Maine Post Office (historical) | Lucerne-In-Maine Post Office (historical) | Hancock | Unknown | |
| Mariaville Post Office (historical) | Mariaville Post Office (historical) | Hancock | Unknown | |
| Manset Post Office | Manset Post Office | Hancock | Unknown | |
| Marlboro Post Office (historical) | Marlboro Post Office (historical) | Hancock | Unknown | |
| McKinley Post Office | McKinley Post Office | Hancock | Unknown | |
| Millvale Post Office (historical) | Millvale Post Office (historical) | Hancock | Unknown | |
| Minturn Post Office (historical) | Minturn Post Office (historical) | Hancock | Unknown | |
| Mount Desert Ferry Post Office (historical) | Mount Desert Ferry Post Office (historical) | Hancock | Unknown | |
| Mount Desert Post Office | Mount Desert Post Office | Hancock | 33 | Southwest Harbor |
| Mountainville Post Office (historical) | Mountainville Post Office (historical) | Hancock | Unknown | |
| Naskeag Post Office (historical) | Naskeag Post Office (historical) | Hancock | Unknown | |
| Newville Post Office (historical) | Newville Post Office (historical) | Hancock | Unknown | |
| Nicolin Post Office (historical) | Nicolin Post Office (historical) | Hancock | Unknown | |
| North Bluehill Post Office (historical) | North Bluehill Post Office (historical) | Hancock | Unknown | |
| North Brooklin Post Office (historical) | North Brooklin Post Office (historical) | Hancock | Unknown | |
| North Brooksville Post Office (historical) | North Brooksville Post Office (historical) | Hancock | Unknown | |
| North Bucksport Post Office (historical) | North Bucksport Post Office (historical) | Hancock | Unknown | |
| North Castine Post Office | North Castine Post Office | Hancock | Unknown | |
| North Deer Isle Post Office | North Deer Isle Post Office | Hancock | Unknown | |
| North Ellsworth Post Office (historical) | North Ellsworth Post Office (historical) | Hancock | Unknown | |
| North Lamoine Post Office (historical) | North Lamoine Post Office (historical) | Hancock | Unknown | |
| North Orland Post Office (historical) | North Orland Post Office (historical) | Hancock | Unknown | |
| North Penobscot Post Office | North Penobscot Post Office | Hancock | Unknown | |
| North Sedgewick Post Office (historical) | North Sedgewick Post Office (historical) | Hancock | Unknown | |
| North Sullivan Post Office | North Sullivan Post Office | Hancock | Unknown | |
| Northeast Harbor Post Office (historical) | Northeast Harbor Post Office (historical) | Hancock | 56 | Southwest Harbor |
| Oak Point Post Office (historical) | Oak Point Post Office (historical) | Hancock | Unknown | |
| Oceanville Post Office | Oceanville Post Office | Hancock | Unknown | |
| Orland Post Office | Orland Post Office | Hancock | Unknown | |
| Osborn Post Office (historical) | Osborn Post Office (historical) | Hancock | Unknown | |
| Otis Post Office (historical) | Otis Post Office (historical) | Hancock | Unknown | |
| Otter Creek Post Office (historical) | Otter Creek Post Office (historical) | Hancock | 131 | Seal Harbor |
| Penobscot Centre Post Office (historical) | Penobscot Centre Post Office (historical) | Hancock | Unknown | |
| Pretty Marsh Post Office (historical) | Pretty Marsh Post Office (historical) | Hancock | Unknown | |
| Prospect Harbor Post Office | Prospect Harbor Post Office | Hancock | Unknown | |
| Reach Post Office (historical) | Reach Post Office (historical) | Hancock | Unknown | |
| Riceville Post Office (historical) | Riceville Post Office (historical) | Hancock | Unknown | |
| Salsbury Cove Post Office (historical) | Salsbury Cove Post Office (historical) | Hancock | 20 | Salsbury Cove |
| Santiago Post Office (historical) | Santiago Post Office (historical) | Hancock | Unknown | |
| Sargentville Post Office | Sargentville Post Office | Hancock | Unknown | |
| Saunders Post Office (historical) | Saunders Post Office (historical) | Hancock | Unknown | |
| Sea Port Post Office (historical) | Sea Port Post Office (historical) | Hancock | Unknown | |
| Seal Cove Post Office | Seal Cove Post Office | Hancock | 62 | Bartlett Island |
| Seal Harbor Post Office | Seal Harbor Post Office | Hancock | 138 | Seal Harbor |
| Seaville Post Office (historical) | Seaville Post Office (historical) | Hancock | Unknown | |
| Seawall Post Office (historical) | Seawall Post Office (historical) | Hancock | Unknown | |
| Sedgwick Post Office (historical) | Sedgwick Post Office (historical) | Hancock | Unknown | |
| Smalls Mills Post Office (historical) | Smalls Mills Post Office (historical) | Hancock | Unknown | |
| Sorrento Post Office | Sorrento Post Office | Hancock | 30 | Bar Harbor |
| Sound Post Office (historical) | Sound Post Office (historical) | Hancock | Unknown | |
| South Bluehill Post Office (historical) | South Bluehill Post Office (historical) | Hancock | Unknown | |
| South Brooksville Post Office | South Brooksville Post Office | Hancock | Unknown | |
| South Deer Isle Post Office (historical) | South Deer Isle Post Office (historical) | Hancock | Unknown | |
| South Gouldsboro Post Office | South Gouldsboro Post Office | Hancock | Unknown | |
| South Hancock Post Office (historical) | South Hancock Post Office (historical) | Hancock | Unknown | |
| South Penobscot Post Office | South Penobscot Post Office | Hancock | Unknown | |
| South Surry Post Office (historical) | South Surry Post Office (historical) | Hancock | Unknown | |
| South West Harbor Post Office | South West Harbor Post Office | Hancock | Unknown | |
| Stonington Post Office | Stonington Post Office | Hancock | Unknown | |
| Sullivan Post Office | Sullivan Post Office | Hancock | Unknown | |
| Sunset Post Office | Sunset Post Office | Hancock | Unknown | |
| Sunshine Post Office (historical) | Sunshine Post Office (historical) | Hancock | Unknown | |
| Surry Post Office | Surry Post Office | Hancock | Unknown | |
| Sutton Post Office | Sutton Post Office | Hancock | Unknown | |
| Swans Island Post Office | Swans Island Post Office | Hancock | 92 | Swans Island |
| Tremont Post Office (historical) | Tremont Post Office (historical) | Hancock | Unknown | |
| Trenton Post Office (historical) | Trenton Post Office (historical) | Hancock | Unknown | |
| Verona Post Office (historical) | Verona Post Office (historical) | Hancock | Unknown | |
| Waltham Post Office (historical) | Waltham Post Office (historical) | Hancock | Unknown | |
| West Brooklin Post Office (historical) | West Brooklin Post Office (historical) | Hancock | Unknown | |
| West Brooksville Post Office | West Brooksville Post Office | Hancock | Unknown | |
| West Deer Isle Post Office (historical) | West Deer Isle Post Office (historical) | Hancock | Unknown | |
| West Eden Post Office (historical) | West Eden Post Office (historical) | Hancock | Unknown | |
| West Ellsworth Post Office (historical) | West Ellsworth Post Office (historical) | Hancock | Unknown | |
| West Franklin Post Office | West Franklin Post Office | Hancock | Unknown | |
| West Gouldsboro Post Office (historical) | West Gouldsboro Post Office (historical) | Hancock | Unknown | |
| West Hancock Post Office (historical) | West Hancock Post Office (historical) | Hancock | Unknown | |
| West Penobscot Post Office (historical) | West Penobscot Post Office (historical) | Hancock | Unknown | |
| West Sedgwick Post Office (historical) | West Sedgwick Post Office (historical) | Hancock | Unknown | |
| West Sullivan Post Office | West Sullivan Post Office | Hancock | Unknown | |
| West Tremont Post Office | West Tremont Post Office | Hancock | 46 | Bartlett Island |
| West Trenton Post Office (historical) | West Trenton Post Office (historical) | Hancock | Unknown | |
| Winter Harbor Post Office | Winter Harbor Post Office | Hancock | Unknown | |
| Allens Corner Post Office (historical) | Allens Corner Post Office (historical) | Cumberland | Unknown | |
| Birch Island Post Office | Birch Island Post Office | Cumberland | Unknown | |
| Bolsters Mills Post Office (historical) | Bolsters Mills Post Office (historical) | Cumberland | Unknown | |
| Bonny Eagle Post Office (historical) | Bonny Eagle Post Office (historical) | Cumberland | Unknown | |
| Bowery Beach Post Office (historical) | Bowery Beach Post Office (historical) | Cumberland | Unknown | |
| Bridgton Post Office (historical) | Bridgton Post Office (historical) | Cumberland | Unknown | |
| Bridgton Valley Post Office (historical) | Bridgton Valley Post Office (historical) | Cumberland | Unknown | |
| Briggs Corner Post Office (historical) | Briggs Corner Post Office (historical) | Cumberland | Unknown | |
| Brunswick Post Office | Brunswick Post Office | Cumberland | 66 | Brunswick |
| Bunganuc Post Office (historical) | Bunganuc Post Office (historical) | Cumberland | Unknown | |
| Bustins Island Post Office | Bustins Island Post Office | Cumberland | Unknown | |
| Cape Cottage Post Office | Cape Cottage Post Office | Cumberland | Unknown | |
| Cape Elizabeth Post Office (historical) | Cape Elizabeth Post Office (historical) | Cumberland | Unknown | |
| Casco Post Office | Casco Post Office | Cumberland | Unknown | |
| Cashs Corner Post Office (historical) | Cashs Corner Post Office (historical) | Cumberland | Unknown | |
| Chebeague Island Post Office | Chebeague Island Post Office | Cumberland | Unknown | |
| Chebeague Post Office (historical) | Chebeague Post Office (historical) | Cumberland | Unknown | |
| Cliff Island Post Office | Cliff Island Post Office | Cumberland | Unknown | |
| Convene Post Office | Convene Post Office | Cumberland | Unknown | |
| Cooks Post Office (historical) | Cooks Post Office (historical) | Cumberland | Unknown | |
| Cousins Island Post Office (historical) | Cousins Island Post Office (historical) | Cumberland | Unknown | |
| Crescent Lake Post Office | Crescent Lake Post Office | Cumberland | Unknown | |
| Cumberland Mills Post Office (historical) | Cumberland Mills Post Office (historical) | Cumberland | Unknown | |
| Cumberland Post Office (historical) | Cumberland Post Office (historical) | Cumberland | Unknown | |
| Cundys Harbor Post Office (historical) | Cundys Harbor Post Office (historical) | Cumberland | Unknown | |
| Cushings Island Post Office | Cushings Island Post Office | Cumberland | Unknown | |
| Deering Center Post Office (historical) | Deering Center Post Office (historical) | Cumberland | Unknown | |
| Deering Post Office (historical) | Deering Post Office (historical) | Cumberland | Unknown | |
| Diamond Post Office (historical) | Diamond Post Office (historical) | Cumberland | Unknown | |
| Douglas Hill Post Office | Douglas Hill Post Office | Cumberland | Unknown | |
| Dry Mills Post Office | Dry Mills Post Office | Cumberland | Unknown | |
| East Baldwin Post Office | East Baldwin Post Office | Cumberland | Unknown | |
| East Deering Post Office (historical) | East Deering Post Office (historical) | Cumberland | Unknown | |
| East North Yarmouth Post Office (historical) | East North Yarmouth Post Office (historical) | Cumberland | Unknown | |
| East Raymond Post Office (historical) | East Raymond Post Office (historical) | Cumberland | Unknown | |
| East Sebago Post Office | East Sebago Post Office | Cumberland | Unknown | |
| East Yarmouth Post Office (historical) | East Yarmouth Post Office (historical) | Cumberland | Unknown | |
| Edes Falls Post Office (historical) | Edes Falls Post Office (historical) | Cumberland | Unknown | |
| Falmouth Foreside Post Office (historical) | Falmouth Foreside Post Office (historical) | Cumberland | Unknown | |
| Falmouth Post Office (historical) | Falmouth Post Office (historical) | Cumberland | Unknown | |
| Freeport Post Office | Freeport Post Office | Cumberland | 148 | Freeport |
| Gorham Post Office | Gorham Post Office | Cumberland | Unknown | |
| Gray Post Office | Gray Post Office | Cumberland | Unknown | |
| Harding Post Office (historical) | Harding Post Office (historical) | Cumberland | Unknown | |
| Harpswell Center Post Office (historical) | Harpswell Center Post Office (historical) | Cumberland | Unknown | |
| Harrison Post Office | Harrison Post Office | Cumberland | Unknown | |
| Higgins Beach Post Office (historical) | Higgins Beach Post Office (historical) | Cumberland | Unknown | |
| Higgins Post Office (historical) | Higgins Post Office (historical) | Cumberland | Unknown | |
| Highland Lake Post Office (historical) | Highland Lake Post Office (historical) | Cumberland | Unknown | |
| Hillside Post Office | Hillside Post Office | Cumberland | Unknown | |
| Intervale Post Office | Intervale Post Office | Cumberland | Unknown | |
| Knightsville Post Office (historical) | Knightsville Post Office (historical) | Cumberland | Unknown | |
| Little Chebeague Post Office (historical) | Little Chebeague Post Office (historical) | Cumberland | Unknown | |
| Little John Island Post Office | Little John Island Post Office | Cumberland | Unknown | |
| Long Island Post Office (historical) | Long Island Post Office (historical) | Cumberland | Unknown | |
| Mariner Post Office (historical) | Mariner Post Office (historical) | Cumberland | Unknown | |
| Mere Point Post Office | Mere Point Post Office | Cumberland | Unknown | |
| Mericoneag Post Office (historical) | Mericoneag Post Office (historical) | Cumberland | Unknown | |
| Mountain Post Office (historical) | Mountain Post Office (historical) | Cumberland | Unknown | |
| Naples Post Office (historical) | Naples Post Office (historical) | Cumberland | Unknown | |
| New Casco Post Office (historical) | New Casco Post Office (historical) | Cumberland | Unknown | |
| New Gloucester Post Office | New Gloucester Post Office | Cumberland | Unknown | |
| Newhall Post Office | Newhall Post Office | Cumberland | Unknown | |
| North Baldwin Post Office | North Baldwin Post Office | Cumberland | Unknown | |
| North Bridgton Post Office | North Bridgton Post Office | Cumberland | Unknown | |
| North Deering Post Office (historical) | North Deering Post Office (historical) | Cumberland | Unknown | |
| North Falmouth Post Office (historical) | North Falmouth Post Office (historical) | Cumberland | Unknown | |
| North Gorham Post Office (historical) | North Gorham Post Office (historical) | Cumberland | Unknown | |
| North Gray Post Office (historical) | North Gray Post Office (historical) | Cumberland | Unknown | |
| North Harpswell Post Office (historical) | North Harpswell Post Office (historical) | Cumberland | Unknown | |
| North Pownal Post Office (historical) | North Pownal Post Office (historical) | Cumberland | Unknown | |
| North Raymond Post Office | North Raymond Post Office | Cumberland | Unknown | |
| North Scarboro Post Office (historical) | North Scarboro Post Office (historical) | Cumberland | Unknown | |
| North Sebago Post Office | North Sebago Post Office | Cumberland | Unknown | |
| North Windham Post Office | North Windham Post Office | Cumberland | Unknown | |
| North Yarmouth Post Office (historical) | North Yarmouth Post Office (historical) | Cumberland | 98 | Yarmouth |
| North Yarmouth Post Office (historical) | North Yarmouth Post Office (historical) | Cumberland | Unknown | |
| North Yarmouth West Post Office (historical) | North Yarmouth West Post Office (historical) | Cumberland | Unknown | |
| Oak Hill Station Post Office (historical) | Oak Hill Station Post Office (historical) | Cumberland | Unknown | |
| Oaks Post Office (historical) | Oaks Post Office (historical) | Cumberland | Unknown | |
| Orrs Island Post Office (historical) | Orrs Island Post Office (historical) | Cumberland | Unknown | |
| Ottawa Post Office (historical) | Ottawa Post Office (historical) | Cumberland | Unknown | |
| Peak Island Post Office (historical) | Peak Island Post Office (historical) | Cumberland | 30 | Portland East |
| Pearl Street Station Post Office | Pearl Street Station Post Office | Cumberland | Unknown | |
| Pine Point Post Office (historical) | Pine Point Post Office (historical) | Cumberland | Unknown | |
| Pleasantdale Post Office (historical) | Pleasantdale Post Office (historical) | Cumberland | Unknown | |
| Pond Cove Post Office (historical) | Pond Cove Post Office (historical) | Cumberland | Unknown | |
| Portland Post Office | Portland Post Office | Cumberland | 52 | Portland West |
| Pownal Post Office (historical) | Pownal Post Office (historical) | Cumberland | Unknown | |
| Presumpscot Post Office (historical) | Presumpscot Post Office (historical) | Cumberland | Unknown | |
| Prides Corner Post Office (historical) | Prides Corner Post Office (historical) | Cumberland | Unknown | |
| Prouts Neck Post Office | Prouts Neck Post Office | Cumberland | Unknown | |
| Raymond Post Office | Raymond Post Office | Cumberland | Unknown | |
| Sabbathday Lake Post Office | Sabbathday Lake Post Office | Cumberland | Unknown | |
| Sandy Beach Post Office (historical) | Sandy Beach Post Office (historical) | Cumberland | Unknown | |
| Sandy Creek Post Office (historical) | Sandy Creek Post Office (historical) | Cumberland | Unknown | |
| Scarboro Post Office (historical) | Scarboro Post Office (historical) | Cumberland | Unknown | |
| Sebago Lake Post Office | Sebago Lake Post Office | Cumberland | Unknown | |
| Sebago Post Office (historical) | Sebago Post Office (historical) | Cumberland | Unknown | |
| Songo Lock Post Office (historical) | Songo Lock Post Office (historical) | Cumberland | Unknown | |
| South Bridgton Post Offfice (historical) | South Bridgton Post Offfice (historical) | Cumberland | Unknown | |
| South Casco Post Office (historical) | South Casco Post Office (historical) | Cumberland | Unknown | |
| South Freeport Post Office | South Freeport Post Office | Cumberland | 72 | Freeport |
| South Harpswell Post Office (historical) | South Harpswell Post Office (historical) | Cumberland | Unknown | |
| South Naples Post Office (historical) | South Naples Post Office (historical) | Cumberland | Unknown | |
| South Portland Station Post Office | South Portland Station Post Office | Cumberland | Unknown | |
| South Standish Post Office (historical) | South Standish Post Office (historical) | Cumberland | Unknown | |
| South Windham Post Office | South Windham Post Office | Cumberland | Unknown | |
| Standish Post Office | Standish Post Office | Cumberland | Unknown | |
| Steep Falls Post Office (historical) | Steep Falls Post Office (historical) | Cumberland | Unknown | |
| Stroudwater Post Office (historical) | Stroudwater Post Office (historical) | Cumberland | Unknown | |
| West End Station Post Office | West End Station Post Office | Cumberland | Unknown | |
| West Falmouth Post Office (historical) | West Falmouth Post Office (historical) | Cumberland | Unknown | |
| West Gorham Post Office (historical) | West Gorham Post Office (historical) | Cumberland | Unknown | |
| West Gray Post Office (historical) | West Gray Post Office (historical) | Cumberland | Unknown | |
| West Harpswell Post Office (historical) | West Harpswell Post Office (historical) | Cumberland | Unknown | |
| West Scarboro Post Office (historical) | West Scarboro Post Office (historical) | Cumberland | Unknown | |
| Westbrook Post Office (historical) | Westbrook Post Office (historical) | Cumberland | 62 | Portland West |
| White Rock Post Office (historical) | White Rock Post Office (historical) | Cumberland | Unknown | |
| Willard Post Office (historical) | Willard Post Office (historical) | Cumberland | Unknown | |
| Windham Center Post Office (historical) | Windham Center Post Office (historical) | Cumberland | Unknown | |
| Windham Center Post Office (historical) | Windham Center Post Office (historical) | Cumberland | Unknown | |
| Woodfords Station Post Office (historical) | Woodfords Station Post Office (historical) | Cumberland | Unknown | |
| Yarmouth Post Office | Yarmouth Post Office | Cumberland | Unknown | |
| Yarmouthville Post Office (historical) | Yarmouthville Post Office (historical) | Cumberland | Unknown | |
| Trefethen Post Office (historical) | Trefethen Post Office (historical) | Cumberland | Unknown | |
| Upper Gloucester Post Office | Upper Gloucester Post Office | Cumberland | Unknown | |
| Upper Yarmouth Post Office (historical) | Upper Yarmouth Post Office (historical) | Cumberland | Unknown | |
| Walnut Hill Post Office (historical) | Walnut Hill Post Office (historical) | Cumberland | Unknown | |
| West Bridgton Post Office (historical) | West Bridgton Post Office (historical) | Cumberland | Unknown | |
| West Brunswick Post Office (historical) | West Brunswick Post Office (historical) | Cumberland | Unknown | |
| West Cumberland Post Office (historical) | West Cumberland Post Office (historical) | Cumberland | Unknown | |
| Air Base Post Office | Air Base Post Office | Penobscot | Unknown | |
| Alton Post Office (historical) | Alton Post Office (historical) | Penobscot | Unknown | |
| Alton Village Post Office (historical) | Alton Village Post Office (historical) | Penobscot | Unknown | |
| Argyle Post Office (historical) | Argyle Post Office (historical) | Penobscot | Unknown | |
| Arnold Post Office (historical) | Arnold Post Office (historical) | Penobscot | Unknown | |
| Bangor Post Office | Bangor Post Office | Penobscot | Unknown | |
| Birch Stream Post Office (historical) | Birch Stream Post Office (historical) | Penobscot | Unknown | |
| Birchville Post Office (historical) | Birchville Post Office (historical) | Penobscot | Unknown | |
| Bradford Centre Post Office | Bradford Centre Post Office | Penobscot | Unknown | |
| Bradford Post Office | Bradford Post Office | Penobscot | Unknown | |
| Bradley Post Office | Bradley Post Office | Penobscot | Unknown | |
| Brewer Station Post Office | Brewer Station Post Office | Penobscot | Unknown | |
| Burlington Post Office | Burlington Post Office | Penobscot | Unknown | |
| Cardville Post Office | Cardville Post Office | Penobscot | Unknown | |
| Carmel Post Office | Carmel Post Office | Penobscot | Unknown | |
| Carroll Post Office | Carroll Post Office | Penobscot | Unknown | |
| Charleston Post Office | Charleston Post Office | Penobscot | 463 | Charleston |
| Chester Mills Post Office (historical) | Chester Mills Post Office (historical) | Penobscot | Unknown | |
| Chester Post Office (historical) | Chester Post Office (historical) | Penobscot | Unknown | |
| Clifton Post Office (historical) | Clifton Post Office (historical) | Penobscot | Unknown | |
| Corinna Center Post Office (historical) | Corinna Center Post Office (historical) | Penobscot | Unknown | |
| Corinna Post Office | Corinna Post Office | Penobscot | Unknown | |
| Corinth Post Office (historical) | Corinth Post Office (historical) | Penobscot | Unknown | |
| Costigan Post Office (historical) | Costigan Post Office (historical) | Penobscot | Unknown | |
| Costigan Station Post Office (historical) | Costigan Station Post Office (historical) | Penobscot | Unknown | |
| Damascus Post Office (historical) | Damascus Post Office (historical) | Penobscot | Unknown | |
| Davidson Post Office (historical) | Davidson Post Office (historical) | Penobscot | Unknown | |
| Dexter Post Office | Dexter Post Office | Penobscot | Unknown | |
| Dixmont Centre Post Office | Dixmont Centre Post Office | Penobscot | Unknown | |
| Dixmont Post Office | Dixmont Post Office | Penobscot | Unknown | |
| Eagle Post Office (historical) | Eagle Post Office (historical) | Penobscot | Unknown | |
| East Bangor Post Office (historical) | East Bangor Post Office (historical) | Penobscot | Unknown | |
| East Bradford Post Office (historical) | East Bradford Post Office (historical) | Penobscot | Unknown | |
| East Corinna Post Office (historical) | East Corinna Post Office (historical) | Penobscot | Unknown | |
| East Corinth Post Office | East Corinth Post Office | Penobscot | Unknown | |
| East Dixmont Post Office (historical) | East Dixmont Post Office (historical) | Penobscot | Unknown | |
| East Eddington Post Office | East Eddington Post Office | Penobscot | Unknown | |
| East Exeter Post Office (historical) | East Exeter Post Office (historical) | Penobscot | Unknown | |
| East Holden Post Office (historical) | East Holden Post Office (historical) | Penobscot | Unknown | |
| East Millinocket Post Office | East Millinocket Post Office | Penobscot | 348 | East Millinocket |
| East Newport Post Office | East Newport Post Office | Penobscot | Unknown | |
| East Orrington Post Office (historical) | East Orrington Post Office (historical) | Penobscot | Unknown | |
| East Stetson Post Office (historical) | East Stetson Post Office (historical) | Penobscot | Unknown | |
| East Winn Post Office (historical) | East Winn Post Office (historical) | Penobscot | Unknown | |
| Eddington Post Office (historical) | Eddington Post Office (historical) | Penobscot | Unknown | |
| Edinburgh Post Office (historical) | Edinburgh Post Office (historical) | Penobscot | Unknown | |
| Enfield Post Office | Enfield Post Office | Penobscot | Unknown | |
| Estes Mills Post Office (historical) | Estes Mills Post Office (historical) | Penobscot | Unknown | |
| Etna Center Post Office (historical) | Etna Center Post Office (historical) | Penobscot | Unknown | |
| Etna Post Office (historical) | Etna Post Office (historical) | Penobscot | Unknown | |
| Exeter Mills Post Office (historical) | Exeter Mills Post Office (historical) | Penobscot | Unknown | |
| Exeter Post Office (historical) | Exeter Post Office (historical) | Penobscot | Unknown | |
| Fitz Mills Post Office (historical) | Fitz Mills Post Office (historical) | Penobscot | Unknown | |
| Fleming Post Office (historical) | Fleming Post Office (historical) | Penobscot | Unknown | |
| Garland Post Office | Garland Post Office | Penobscot | Unknown | |
| Gerry Post Office (historical) | Gerry Post Office (historical) | Penobscot | Unknown | |
| Glenburn Post Office (historical) | Glenburn Post Office (historical) | Penobscot | Unknown | |
| Glenville Post Office (historical) | Glenville Post Office (historical) | Penobscot | Unknown | |
| Goodales Corner Post Office (historical) | Goodales Corner Post Office (historical) | Penobscot | Unknown | |
| Great Works Post Office | Great Works Post Office | Penobscot | Unknown | |
| Greenbush Post Office (historical) | Greenbush Post Office (historical) | Penobscot | Unknown | |
| Greenfield Post Office (historical) | Greenfield Post Office (historical) | Penobscot | Unknown | |
| Grindstone Post Office | Grindstone Post Office | Penobscot | Unknown | |
| Hampden Center Post Office (historical) | Hampden Center Post Office (historical) | Penobscot | Unknown | |
| Hampden Highlands Post Office (historical) | Hampden Highlands Post Office (historical) | Penobscot | Unknown | |
| Hampden Post Office | Hampden Post Office | Penobscot | Unknown | |
| Hermon Center Post Office (historical) | Hermon Center Post Office (historical) | Penobscot | Unknown | |
| Hermon Lake Post Office (historical) | Hermon Lake Post Office (historical) | Penobscot | Unknown | |
| Hermon Post Office (historical) | Hermon Post Office (historical) | Penobscot | Unknown | |
| Holts Mills Post Office (historical) | Holts Mills Post Office (historical) | Penobscot | Unknown | |
| Howland Post Office | Howland Post Office | Penobscot | 161 | Howland |
| Hudson Post Office (historical) | Hudson Post Office (historical) | Penobscot | Unknown | |
| Hudson Post Office | Hudson Post Office | Penobscot | Unknown | |
| Kenduskeag Post Office (historical) | Kenduskeag Post Office (historical) | Penobscot | Unknown | |
| Kingman Post Office | Kingman Post Office | Penobscot | Unknown | |
| La Grange Post Office | La Grange Post Office | Penobscot | Unknown | |
| Lee Post Office | Lee Post Office | Penobscot | Unknown | |
| Lincoln Center Post Office | Lincoln Center Post Office | Penobscot | Unknown | |
| Lincoln Post Office | Lincoln Post Office | Penobscot | 207 | Lincoln West |
| Lowell Post Office (historical) | Lowell Post Office (historical) | Penobscot | Unknown | |
| Matagamon Post Office (historical) | Matagamon Post Office (historical) | Penobscot | Unknown | |
| Mattawamkeag Post Office | Mattawamkeag Post Office | Penobscot | Unknown | |
| Maxfield Post Office (historical) | Maxfield Post Office (historical) | Penobscot | Unknown | |
| Maxfield Post Office (historical) | Maxfield Post Office (historical) | Penobscot | Unknown | |
| Milford Post Office | Milford Post Office | Penobscot | Unknown | |
| Millinocket Post Office | Millinocket Post Office | Penobscot | 364 | Millinocket |
| Myra Post Office (historical) | Myra Post Office (historical) | Penobscot | Unknown | |
| Myrick Post Office (historical) | Myrick Post Office (historical) | Penobscot | Unknown | |
| Nealeys Corner Post Office (historical) | Nealeys Corner Post Office (historical) | Penobscot | Unknown | |
| Newburg Center Post Office (historical) | Newburg Center Post Office (historical) | Penobscot | Unknown | |
| Newburg Post Office (historical) | Newburg Post Office (historical) | Penobscot | Unknown | |
| Newburg Village Post Office (historical) | Newburg Village Post Office (historical) | Penobscot | Unknown | |
| Newport Post Office | Newport Post Office | Penobscot | Unknown | |
| Norcross Post Office | Norcross Post Office | Penobscot | Unknown | |
| North Bangor Post Office (historical) | North Bangor Post Office (historical) | Penobscot | Unknown | |
| North Bradford Post Office (historical) | North Bradford Post Office (historical) | Penobscot | Unknown | |
| North Carmel Post Office (historical) | North Carmel Post Office (historical) | Penobscot | Unknown | |
| North Corinna Post Office (historical) | North Corinna Post Office (historical) | Penobscot | Unknown | |
| North Dexter Post Office (historical) | North Dexter Post Office (historical) | Penobscot | Unknown | |
| North Dixmont Post Office (historical) | North Dixmont Post Office (historical) | Penobscot | Unknown | |
| North Hampden Post Office (historical) | North Hampden Post Office (historical) | Penobscot | Unknown | |
| North Hermon Post Office (historical) | North Hermon Post Office (historical) | Penobscot | Unknown | |
| North Howland Post Office (historical) | North Howland Post Office (historical) | Penobscot | Unknown | |
| North Lakeville Post Office (historical) | North Lakeville Post Office (historical) | Penobscot | Unknown | |
| North Lee Post Office (historical) | North Lee Post Office (historical) | Penobscot | Unknown | |
| North Lincoln Post Office (historical) | North Lincoln Post Office (historical) | Penobscot | Unknown | |
| North Newburg Post Office (historical) | North Newburg Post Office (historical) | Penobscot | Unknown | |
| North Newport Post Office (historical) | North Newport Post Office (historical) | Penobscot | Unknown | |
| North Orrington Post Office (historical) | North Orrington Post Office (historical) | Penobscot | Unknown | |
| North Woodville Post Office (historical) | North Woodville Post Office (historical) | Penobscot | Unknown | |
| Number Six Post Office (historical) | Number Six Post Office (historical) | Penobscot | Unknown | |
| Olamon Post Office | Olamon Post Office | Penobscot | 148 | Olamon |
| Old Town Post Office | Old Town Post Office | Penobscot | 115 | Old Town |
| Oraomo Post Office (historical) | Oraomo Post Office (historical) | Penobscot | Unknown | |
| Orono Post Office | Orono Post Office | Penobscot | Unknown | |
| Orrington Center Post Office (historical) | Orrington Center Post Office (historical) | Penobscot | Unknown | |
| Owen Post Office (historical) | Owen Post Office (historical) | Penobscot | Unknown | |
| Passadumkeag Post Office | Passadumkeag Post Office | Penobscot | Unknown | |
| Pattagumpus Post Office (historical) | Pattagumpus Post Office (historical) | Penobscot | Unknown | |
| Patten Post Office (historical) | Patten Post Office (historical) | Penobscot | 610 | Patten |
| Pea Cove Post Office (historical) | Pea Cove Post Office (historical) | Penobscot | Unknown | |
| Perkins Post Office (historical) | Perkins Post Office (historical) | Penobscot | Unknown | |
| Pleasantville Post Office (historical) | Pleasantville Post Office (historical) | Penobscot | Unknown | |
| Plymouth Post Office | Plymouth Post Office | Penobscot | Unknown | |
| Powersville Post Office (historical) | Powersville Post Office (historical) | Penobscot | Unknown | |
| Prentiss Post Office | Prentiss Post Office | Penobscot | Unknown | |
| Robyville Post Office (historical) | Robyville Post Office (historical) | Penobscot | Unknown | |
| Riverton Post Office (historical) | Riverton Post Office (historical) | Penobscot | Unknown | |
| Rocky Rips Post Office (historical) | Rocky Rips Post Office (historical) | Penobscot | Unknown | |
| Saponac Post Office | Saponac Post Office | Penobscot | Unknown | |
| Seboeis Post Office | Seboeis Post Office | Penobscot | Unknown | |
| Sherman Station Post Office | Sherman Station Post Office | Penobscot | 486 | Patten |
| Shin Pond Post Office | Shin Pond Post Office | Penobscot | Unknown | |
| Silver Mills Post Office (historical) | Silver Mills Post Office (historical) | Penobscot | Unknown | |
| Simpsons Corner Post Office (historical) | Simpsons Corner Post Office (historical) | Penobscot | Unknown | |
| Six Mile Falls Post Office (historical) | Six Mile Falls Post Office (historical) | Penobscot | Unknown | |
| Snow Corner Post Office (historical) | Snow Corner Post Office (historical) | Penobscot | Unknown | |
| South Argyle Post Office (historical) | South Argyle Post Office (historical) | Penobscot | Unknown | |
| South Brewer Post Office | South Brewer Post Office | Penobscot | Unknown | |
| South Charleston Post Office (historical) | South Charleston Post Office (historical) | Penobscot | Unknown | |
| South Corinth Post Office (historical) | South Corinth Post Office (historical) | Penobscot | Unknown | |
| South Dexter Post Office (historical) | South Dexter Post Office (historical) | Penobscot | Unknown | |
| South Dutton Post Office (historical) | South Dutton Post Office (historical) | Penobscot | Unknown | |
| South Etna Post Office (historical) | South Etna Post Office (historical) | Penobscot | Unknown | |
| South Exeter Post Office (historical) | South Exeter Post Office (historical) | Penobscot | Unknown | |
| South Hudson Post Office (historical) | South Hudson Post Office (historical) | Penobscot | Unknown | |
| South Lagrange Post Office (historical) | South Lagrange Post Office (historical) | Penobscot | Unknown | |
| South Lincoln Post Office (historical) | South Lincoln Post Office (historical) | Penobscot | Unknown | |
| South Medway Post Office (historical) | South Medway Post Office (historical) | Penobscot | Unknown | |
| South Newburg Post Office (historical) | South Newburg Post Office (historical) | Penobscot | Unknown | |
| South Orrington Post Office | South Orrington Post Office | Penobscot | Unknown | |
| South Springfield Post Office (historical) | South Springfield Post Office (historical) | Penobscot | Unknown | |
| South Stetson Post Office (historical) | South Stetson Post Office (historical) | Penobscot | Unknown | |
| South Winn Post Office (historical) | South Winn Post Office (historical) | Penobscot | Unknown | |
| South Woodville Post Office (historical) | South Woodville Post Office (historical) | Penobscot | Unknown | |
| Springfield Post Office | Springfield Post Office | Penobscot | Unknown | |
| Stacyville Post Office (historical) | Stacyville Post Office (historical) | Penobscot | Unknown | |
| Stetson Post Office (historical) | Stetson Post Office (historical) | Penobscot | Unknown | |
| Stillwater Post Office | Stillwater Post Office | Penobscot | Unknown | |
| Sunkhaze Post Office (historical) | Sunkhaze Post Office (historical) | Penobscot | Unknown | |
| Twin Lakes Post Office (historical) | Twin Lakes Post Office (historical) | Penobscot | Unknown | |
| Veazie Post Office (historical) | Veazie Post Office (historical) | Penobscot | Unknown | |
| West Baldwin Post Office | West Baldwin Post Office | Penobscot | Unknown | |
| West Bangor Post Office (historical) | West Bangor Post Office (historical) | Penobscot | Unknown | |
| West Charleston Post Office (historical) | West Charleston Post Office (historical) | Penobscot | Unknown | |
| West Corinna Post Office (historical) | West Corinna Post Office (historical) | Penobscot | Unknown | |
| West Corinth Post Office (historical) | West Corinth Post Office (historical) | Penobscot | Unknown | |
| West Enfield Post Office | West Enfield Post Office | Penobscot | Unknown | |
| West Garland Post Office (historical) | West Garland Post Office (historical) | Penobscot | Unknown | |
| West Glenburn Post Office (historical) | West Glenburn Post Office (historical) | Penobscot | Unknown | |
| West Hampden Post Office (historical) | West Hampden Post Office (historical) | Penobscot | Unknown | |
| West Howland Post Office (historical) | West Howland Post Office (historical) | Penobscot | Unknown | |
| West Levant Post Office (historical) | West Levant Post Office (historical) | Penobscot | Unknown | |
| West Newburg Post Office (historical) | West Newburg Post Office (historical) | Penobscot | Unknown | |
| West Oldtown Post Office (historical) | West Oldtown Post Office (historical) | Penobscot | Unknown | |
| West Seboois Post Office | West Seboois Post Office | Penobscot | Unknown | |
| Winn Post Office | Winn Post Office | Penobscot | Unknown | |
| Woodville Post Office (historical) | Woodville Post Office (historical) | Penobscot | Unknown | |
| Medway Post Office | Medway Post Office | Penobscot | Unknown | |
| Sherman Mills Post Office (historical) | Sherman Mills Post Office (historical) | Penobscot | Unknown | |
| Sherman Station Post Office (historical) | Sherman Station Post Office (historical) | Aroostook | Unknown | |
| China Village Post Office | China Village Post Office | Kennebec | 249 | China Lake |