Iowa

List of Counties in Iowa

The state of Iowa has a total of 99 counties. Des Moines County is the oldest (founded in 1834), while Humboldt County is the youngest (established in 1857).

Polk County is the most populous, with a population of 430,640 people. Kossuth County (2,520 km2) has the largest land area, while Dickinson County has the smallest (987 km2).

Please find a list of all Iowa counties sorted alphabetically below.

  • Adait County, IA
  • Adams County, IA
  • Allamakee County, IA
  • Appanoose County, IA
  • Audubon County, IA
  • Benton County, IA
  • Black Hawk County, IA
  • Boone County, IA
  • Bremer County, IA
  • Buchanan County, IA
  • Buena Vista County, IA
  • Butler County, IA
  • Calhoun County, IA
  • Carroll County, IA
  • Cass County, IA
  • Cedar County, IA
  • Cerro Gordo County, IA
  • Cherokee County, IA
  • Chichasaw County, IA
  • Clarke County, IA
  • Clay County, IA
  • Clayton County, IA
  • Clinton County, IA
  • Crawford County, IA
  • Dallas County, IA
  • Davis County, IA
  • Decatur County, IA
  • Delaware County, IA
  • Des Moines County, IA
  • Dickinson County, IA
  • Dubuque County, IA
  • Emmett County, IA
  • Fayette County, IA
  • Floyd County, IA
  • Franklin County, IA
  • Fremont County, IA
  • Greene County, IA
  • Grundy County, IA
  • Guthrie County, IA
  • Hamilton County, IA
  • Hancock County, IA
  • Hardin County, IA
  • Harrison County, IA
  • Henry County, IA
  • Howard County, IA
  • Humboldt County, IA
  • Ida County, IA
  • Iowa County, IA
  • Jackson County, IA
  • Jasper County, IA
  • Jefferson County, IA
  • Johnson County, IA
  • Jones County, IA
  • Keokuk County, IA
  • Kossuth County, IA
  • Lee County, IA
  • Linn County, IA
  • Louisa County, IA
  • Lucas County, IA
  • Lyon County, IA
  • Madison County, IA
  • Mahaska County, IA
  • Marion County, IA
  • Marshall County, IA
  • Mills County, IA
  • Mitchell County, IA
  • Monona County, IA
  • Monroe County, IA
  • Montgomery County, IA
  • Muscatine County, IA
  • O’Brien County, IA
  • Osceola County, IA
  • Page County, IA
  • Palo Alto County, IA
  • Plymouth County, IA
  • Pocahontas County, IA
  • Polk County, IA
  • Pottawattamie County, IA
  • Poweshiek County, IA
  • Ringgold County, IA
  • Sac County, IA
  • Scott County, IA
  • Shelby County, IA
  • Sioux County, IA
  • Story County, IA
  • Tama County, IA
  • Taylor County, IA
  • Union County, IA
  • Van Buren County, IA
  • Wapello County, IA
  • Warren County, IA
  • Washington County, IA
  • Wayne County, IA
  • Webster County, IA
  • Wineshiek County, IA
  • Winnebago County, IA
  • Woodbury County, IA
  • Worth County, IA
  • Wright County, IA

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