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Iowa Counties
Iowa County map
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Iowa Counties

There are ninety-nine counties in Iowa. The first two counties, Des Moines County and Dubuque County, were created in 1834 when Iowa was still part of the Michigan Territory. In preparation for Michigan's statehood, part of Michigan Territory was formed into Wisconsin Territory in 1836]. Two years later, the western portion was split off to become Iowa Territory. The south-eastern part of Iowa Territory became Iowa, the 29th state in the union, on 28 December 1846, by which point 44 Counties had been created. Counties continued to be created by the state government until 1857, when the last county, Humboldt County, was created.

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Iowa Counties: History and Information

Focused on the histories of Iowa countiesBrief history of Iowa Counties: Flags of Our Nation

Iowa is a state in the Midwestern region of the United States of America. It is the 29th state of the United States, having joined the Union on December 28, 1846. The state is named for the Ioway people, a Siouan tribe of Native Americans that formerly lived there.

There are 99 counties in the state of Iowa. The first two counties, Des Moines County and Dubuque County, were created in 1834 when Iowa was still part of the Michigan Territory. In preparation for Michigan's statehood, part of Michigan Territory was formed into Wisconsin Territory in 1836. Two years later, the western portion was split off to become Iowa Territory. The south-eastern part of Iowa Territory became Iowa, the 29th state in the union, on 28 December 1846, by which point 44 counties had been created. Counties continued to be created by the state government until 1857, when the last county, Humboldt County, was created. One of the most significant days in Iowa county history was January 15, 1851, on which 49 counties were created.

Focused on the histories of Iowa counties
County 2000
Population
Square
Miles
County Seat Created
Adair County 8,243 569 Greenfield 1851
Adams County 4,482 424 Corning 1851
Allamakee County 14,675 640 Waukon 1847
Appanoose County 13,721 496 Centerville 1843
Audubon County 6,830 443 Audubon 1851
Benton County 25,308 716 Vinton 1837
Black Hawk County 128,012 567 Waterloo 1843
Boone County 26,224 572 Boone 1846
Bremer County 23,325 438 Waverly 1851
Buchanan County 21,093 571 Independence 1837
Buena Vista County 20,411 575 Storm Lake 1851
Butler County 15,305 580 Allison 1851
Calhoun County 11,115 570 Rockwell City 1851
Carroll County 21,421 569 Carroll 1851
Cass County 14,684 564 Atlantic 1851
Cedar County 18,187 580 Tipton 1837
Cerro Gordo County 46,447 568 Mason City 1851
Cherokee County 13,035 577 Cherokee 1851
Chickasaw County 13,095 505 New Hampton 1851
Clarke County 9,133 431 Osceola 1846
Clay County 17,372 569 Spencer 1851
Clayton County 18,678 779 Elkader 1837
Clinton County 50,149 695 Clinton 1837
Crawford County 16,942 714 Denison 1851
Dallas County 40,750 586 Adel 1846
Davis County 8,541 503 Bloomfield 1843
Decatur County 8,689 532 Leon 1846
Delaware County 18,404 578 Manchester 1837
Des Moines County 42,351 416 Burlington 1834
Dickinson County 16,424 381 Spirit Lake 1851
Dubuque County 89,143 608 Dubuque 1834
Emmet County 11,027 396 Estherville 1851
Fayette County 22,008 731 West Union 1837
Floyd County 16,900 501 Charles City 1851
Franklin County 10,704 582 Hampton 1851
Fremont County 8,010 511 Sidney 1847
Greene County 10,366 568 Jefferson 1851
Grundy County 12,369 503 Grundy Center 1851
Guthrie County 11,353 591 Guthrie Center 1851
Hamilton County 16,438 577 Webster City 1856
Hancock County 12,100 571 Garner 1851
Hardin County 18,812 569 Eldora 1851
Harrison County 15,666 697 Logan 1851
Henry County 20,336 434 Mount Pleasant 1836
Howard County 9,932 473 Cresco 1851
Humboldt County 10,381 434 Dakota City 1851
Ida County 7,837 432 Ida Grove 1851
Iowa County 15,671 586 Marengo 1843
Jackson County 20,296 636 Maquoketa 1837
Jasper County 37,213 730 Newton 1846
Jefferson County 16,181 435 Fairfield 1839
Johnson County 111,006 614 Iowa City 1837
Jones County 20,221 575 Anamosa 1837
Keokuk County 11,400 579 Sigourney 1837
Kossuth County 17,163 973 Algona 1851
Lee County 38,052 517 Fort Madison 1836
Linn County 191,701 718 Cedar Rapids 1837
Louisa County 12,183 402 Wapello 1836
Lucas County 9,422 431 Chariton 1846
Lyon County 11,763 588 Rock Rapids 1851
Madison County 14,019 561 Winterset 1844
Mahaska County 22,335 571 Oskaloosa 1843
Marion County 32,052 554 Knoxville 1845
Marshall County 39,311 572 Marshalltown 1846
Mills County 14,547 437 Glenwood 1851
Mitchell County 10,874 469 Osage 1851
Monona County 10,020 693 Onawa 1851
Monroe County 8,016 433 Albia 1843
Montgomery County 11,771 424 Red Oak 1851
Muscatine County 41,722 439 Muscatine 1836
O'Brien County 15,102 573 Primghar 1851
Osceola County 7,003 399 Sibley 1851
Page County 16,976 535 Clarinda 1847
Palo Alto County 10,147 564 Emmetsburg 1851
Plymouth County 24,849 864 Le Mars 1851
Pocahontas County 8,662 578 Pocahontas 1851
Polk County 374,601 570 Des Moines 1846
Pottawattamie County 87,704 954 Council Bluffs 1848
Poweshiek County 18,815 585 Montezuma 1843
Ringgold County 5,469 538 Mount Ayr 1855
Sac County 11,529 576 Sac City 1851
Scott County 158,668 458 Davenport 1837
Shelby County 13,173 591 Harlan 1851
Sioux County 31,589 768 Orange City 1851
Story County 79,981 573 Nevada 1846
Tama County 18,103 721 Toledo 1843
Taylor County 6,958 534 Bedford 1847
Union County 12,309 424 Creston 1851
Van Buren County 7,809 485 Keosauqua 1836
Wapello County 36,051 432 Ottumwa 1843
Warren County 40,671 572 Indianola 1846
Washington County 20,670 569 Washington 1837
Wayne County 6,730 526 Corydon 1846
Webster County 40,235 715 Fort Dodge 1853
Winnebago County 11,723 400 Forest City 1847
Winneshiek County 21,310 690 Decorah 1847
Woodbury County 103,877 873 Sioux City 1851
Worth County 7,909 400 Northwood 1851
Wright County 14,334 581 Clarion 1851
County Resources
US Counties
Names given the counties, our most locally based jurisdictions, reflects the "characteristic features of this country!"
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