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Iowa Census: County Populations

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County 2010 Population 2000 Population Percent Change
Adair 7,682 8,243 -6.8%
Adams 4,029 4,482 -10.1%
Allamakee 14,330 14,675 -2.4%
Appanoose 12,887 13,721 -6.1%
Audubon 6,119 6,830 -10.4%
Benton 26,076 25,308 3.0%
Black Hawk 131,090 128,012 2.4%
Boone 26,306 26,224 0.3%
Bremer 24,276 23,325 4.1%
Buchanan 20,958 21,093 -0.6%
Buena Vista 20,260 20,411 -0.7%
Butler 14,867 15,305 -2.9%
Calhoun 9,670 11,115 -13.0%
Carroll 20,816 21,421 -2.8%
Cass 13,956 14,684 -5.0%
Cedar 18,499 18,187 1.7%
Cerro Gordo 44,151 46,447 -4.9%
Cherokee 12,072 13,035 -7.4%
Chickasaw 12,439 13,095 -5.0%
Clarke 9,286 9,133 1.7%
Clay 16,667 17,372 -4.1%
Clayton 18,129 18,678 -2.9%
Clinton 49,116 50,149 -2.1%
Crawford 17,096 16,942 0.9%
Dallas 66,135 40,750 62.3%
Davis 8,753 8,541 2.5%
Decatur 8,457 8,689 -2.7%
Delaware 17,764 18,404 -3.5%
Des Moines 40,325 42,351 -4.8%
Dickinson 16,667 16,424 1.5%
Dubuque 93,653 89,143 5.1%
Emmet 10,302 11,027 -6.6%
Fayette 20,880 22,008 -5.1%
Floyd 16,303 16,900 -3.5%
Franklin 10,680 10,704 -0.2%
Fremont 7,441 8,010 -7.1%
Greene 9,336 10,366 -9.9%
Grundy 12,453 12,369 0.7%
Guthrie 10,954 11,353 -3.5%
Hamilton 15,673 16,438 -4.7%
Hancock 11,341 12,100 -6.3%
Hardin 17,534 18,812 -6.8%
Harrison 14,928 15,666 -4.7%
Henry 20,145 20,336 -0.9%
Howard 9,566 9,932 -3.7%
Humboldt 9,815 10,381 -5.5%
Ida 7,089 7,837 -9.5%
Iowa 16,355 15,671 4.4%
Jackson 19,848 20,296 -2.2%
Jasper 36,842 37,213 -1.0%
Jefferson 16,843 16,181 4.1%
Johnson 130,882 111,006 17.9%
Jones 20,638 20,221 2.1%
Keokuk 10,511 11,400 -7.8%
Kossuth 15,543 17,163 -9.4%
Lee 35,862 38,052 -5.8%
Linn 211,226 191,701 10.2%
Louisa 11,387 12,183 -6.5%
Lucas 8,898 9,422 -5.6%
Lyon 11,581 11,763 -1.5%
Madison 15,679 14,019 11.8%
Mahaska 22,381 22,335 0.2%
Marion 33,309 32,052 3.9%
Marshall 40,648 39,311 3.4%
Mills 15,059 14,547 3.5%
Mitchell 10,776 10,874 -0.9%
Monona 9,243 10,020 -7.8%
Monroe 7,970 8,016 -0.6%
Montgomery 10,740 11,771 -8.8%
Muscatine 42,745 41,722 2.5%
O'Brien 14,398 15,102 -4.7%
Osceola 6,462 7,003 -7.7%
Page 15,932 16,976 -6.1%
Palo Alto 9,421 10,147 -7.2%
Plymouth 24,986 24,849 0.6%
Pocahontas 7,310 8,662 -15.6%
Polk 430,640 374,601 15.0%
Pottawattamie 93,158 87,704 6.2%
Poweshiek 18,914 18,815 0.5%
Ringgold 5,131 5,469 -6.2%
Sac 10,350 11,529 -10.2%
Scott 165,224 158,668 4.1%
Shelby 12,167 13,173 -7.6%
Sioux 33,704 31,589 6.7%
Story 89,542 79,981 12.0%
Tama 17,767 18,103 -1.9%
Taylor 6,317 6,958 -9.2%
Union 12,534 12,309 1.8%
Van Buren 7,570 7,809 -3.1%
Wapello 35,625 36,051 -1.2%
Warren 46,225 40,671 13.7%
Washington 21,704 20,670 5.0%
Wayne 6,403 6,730 -4.9%
Webster 38,013 40,235 -5.5%
Winnebago 10,866 11,723 -7.3%
Winneshiek 21,056 21,310 -1.2%
Woodbury 102,172 103,877 -1.6%
Worth 7,598 7,909 -3.9%
Wright 13,229 14,334 -7.7%