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IOWA COUNTIES (by size)
There are 99 administrative divisions, referred to as counties, in the state of Iowa. The population figures given below are from the 2000 census. You may list the counties by county name, by area in square miles, by year organized or by population by clicking on the column headings or using the pull-down list box.
County Area (sq miles) County Seat Established Population (2000) Search
Dickinson County 381 Spirit Lake [ Map ] 1851 16,424 Search
Emmet County 396 Estherville [ Map ] 1851 11,027 Search
Osceola County 399 Sibley [ Map ] 1851 7,003 Search
Winnebago County 400 Forest City [ Map ] 1847 11,723 Search
Worth County 400 Northwood [ Map ] 1851 7,909 Search
Louisa County 402 Wapello [ Map ] 1836 12,183 Search
Des Moines County 416 Burlington [ Map ] 1834 42,351 Search
Adams County 424 Corning [ Map ] 1851 4,482 Search
Montgomery County 424 Red Oak [ Map ] 1851 11,771 Search
Union County 424 Creston [ Map ] 1851 12,309 Search
Clarke County 431 Osceola [ Map ] 1846 9,133 Search
Lucas County 431 Chariton [ Map ] 1846 9,422 Search
Wapello County 432 Ottumwa [ Map ] 1843 36,051 Search
Monroe County 433 Albia [ Map ] 1843 8,016 Search
Henry County 434 Mount Pleasant [ Map ] 1836 20,336 Search
Jefferson County 435 Fairfield [ Map ] 1839 16,181 Search
Mills County 437 Glenwood [ Map ] 1851 14,547 Search
Bremer County 438 Waverly [ Map ] 1851 23,325 Search
Muscatine County 439 Muscatine [ Map ] 1836 41,722 Search
Audubon County 443 Audubon [ Map ] 1851 6,830 Search
Scott County 458 Davenport [ Map ] 1837 158,668 Search
Mitchell County 469 Osage [ Map ] 1851 10,874 Search
Van Buren County 485 Keosauqua [ Map ] 1836 7,809 Search
Appanoose County 496 Centerville [ Map ] 1843 13,721 Search
Floyd County 501 Charles City [ Map ] 1851 16,900 Search
Davis County 503 Bloomfield [ Map ] 1843 8,541 Search
Grundy County 503 Grundy Center [ Map ] 1851 12,369 Search
Chickasaw County 505 New Hampton [ Map ] 1851 13,095 Search
Fremont County 511 Sidney [ Map ] 1847 8,010 Search
Lee County 517 Fort Madison [ Map ] 1836 38,052 Search
Wayne County 526 Corydon [ Map ] 1846 6,730 Search
Decatur County 532 Leon [ Map ] 1846 8,689 Search
Taylor County 534 Bedford [ Map ] 1847 6,958 Search
Page County 535 Clarinda [ Map ] 1847 16,976 Search
Ringgold County 538 Mount Ayr [ Map ] 1855 5,469 Search
Marion County 554 Knoxville [ Map ] 1845 32,052 Search
Madison County 561 Winterset [ Map ] 1844 14,019 Search
Cass County 564 Atlantic [ Map ] 1851 14,684 Search
Palo Alto County 564 Emmetsburg [ Map ] 1851 10,147 Search
Black Hawk County 567 Waterloo [ Map ] 1843 128,012 Search
Cerro Gordo County 568 Mason City [ Map ] 1851 46,447 Search
Greene County 568 Jefferson [ Map ] 1851 10,366 Search
Adair County 569 Greenfield [ Map ] 1851 8,243 Search
Carroll County 569 Carroll [ Map ] 1851 21,421 Search
Clay County 569 Spencer [ Map ] 1851 17,372 Search
Hardin County 569 Eldora [ Map ] 1851 18,812 Search
Washington County 569 Washington [ Map ] 1837 20,670 Search
Calhoun County 570 Rockwell City [ Map ] 1851 11,115 Search
Polk County 570 Des Moines [ Map ] 1846 374,601 Search
Buchanan County 571 Independence [ Map ] 1837 21,093 Search
Mahaska County 571 Oskaloosa [ Map ] 1843 22,335 Search
Boone County 572 Boone [ Map ] 1846 26,224 Search
Marshall County 572 Marshalltown [ Map ] 1846 39,311