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| General Information: | |
| Name: | Polk |
| Land Area: | 591.9 |
| State Name: | Iowa |
| Males: | 181739 |
| Females : | 192862 |
| Total Population 2004: | 394693 |
| Total Population 2000: | 374601 |
| 2004 Population per Sq. Miles: | 666.8 |
| 2004 Population per Sq. Miles: | 632.9 |
Map of Polk County:
| Races in Polk County: | |
| White: | 330917 |
| Black/African American: | 18113 |
| Hispanic: | 16490 |
| Asian: | 9858 |
| American Indian & Alaska Native: | 1001 |
| Native Hawaian Pacific Islander: | 209 |
| Multi Race: | 6204 |
| Ohter Race: | 8299 |
| Population by Age in Polk County: | |
| Under 5 years: | 27955 |
| 5 to 17 Years: | 68345 |
| 18 to 21 years: | 19743 |
| 22 to 29 years: | 44750 |
| 30 to 39 yeras: | 61393 |
| 40 to 49 years: | 57097 |
| 50 to 64 years: | 53566 |
| 64 and over: | 41752 |
| Median Age in Polk County: | |
| Average Median Age: | 34.4 |
| Male Median Age: | 33.2 |
| Female Median Age: | 35.5 |
Cities in Iowa (With population 10,000 or more):
| Altoona (10345) | Ames (50731) | Ankeny (27117) | Bettendorf (31275) | Boone (12803) |
| Burlington (26839) | Carroll (10106) | Cedar Falls (36145) | Cedar Rapids (120758) | Clinton (27772) |
| Clive (12855) | Coralville (15123) | Council Bluffs (58268) | Davenport (98359) | Des Moines (198682) |
| Dubuque (57686) | Fort Dodge (25136) | Fort Madison (10715) | Indianola (12998) | Iowa City (62220) |
| Keokuk (11427) | Marion (26294) | Marshalltown (26009) | Mason City (29172) | Muscatine (22697) |
| Newton (15579) | Oskaloosa (10938) | Ottumwa (24998) | Sioux City (85013) | Spencer (11317) |
| Storm Lake (10076) | Urbandale (29072) | Waterloo (68747) | West Des Moines (46403) |