All counties in Iowa

County NamePopulationStateRank
Polk County430,640Iowa1
Linn County211,226Iowa2
Scott County165,224Iowa3
Black Hawk County131,090Iowa4
Johnson County130,882Iowa5
Woodbury County102,172Iowa6
Dubuque County93,653Iowa7
Pottawattamie County93,158Iowa8
Story County89,542Iowa9
Dallas County66,135Iowa10
Clinton County49,116Iowa11
Warren County46,225Iowa12
Cerro Gordo County44,151Iowa13
Muscatine County42,745Iowa14
Marshall County40,648Iowa15
Des Moines County40,325Iowa16
Webster County38,013Iowa17
Jasper County36,842Iowa18
Lee County35,862Iowa19
Wapello County35,625Iowa20
Sioux County33,704Iowa21
Marion County33,309Iowa22
Boone County26,306Iowa23
Benton County26,076Iowa24
Plymouth County24,986Iowa25
Bremer County24,276Iowa26
Mahaska County22,381Iowa27
Washington County21,704Iowa28
Winneshiek County21,056Iowa29
Buchanan County20,958Iowa30
Fayette County20,880Iowa31
Carroll County20,816Iowa32
Jones County20,638Iowa33
Buena Vista County20,260Iowa34
Henry County20,145Iowa35
Jackson County19,848Iowa36
Poweshiek County18,914Iowa37
Cedar County18,499Iowa38
Clayton County18,129Iowa39
Tama County17,767Iowa40
Delaware County17,764Iowa41
Hardin County17,534Iowa42
Crawford County17,096Iowa43
Jefferson County16,843Iowa44
Dickinson County16,667Iowa45
Clay County16,667Iowa46
Iowa County16,355Iowa47
Floyd County16,303Iowa48
Page County15,932Iowa49
Madison County15,679Iowa50
Hamilton County15,673Iowa51
Kossuth County15,543Iowa52
Mills County15,059Iowa53
Harrison County14,928Iowa54
Butler County14,867Iowa55
O'brien County14,398Iowa56
Allamakee County14,330Iowa57
Cass County13,956Iowa58
Wright County13,229Iowa59
Appanoose County12,887Iowa60
Union County12,534Iowa61
Grundy County12,453Iowa62
Chickasaw County12,439Iowa63
Shelby County12,167Iowa64
Cherokee County12,072Iowa65
Lyon County11,581Iowa66
Louisa County11,387Iowa67
Hancock County11,341Iowa68
Guthrie County10,954Iowa69
Winnebago County10,866Iowa70
Mitchell County10,776Iowa71
Montgomery County10,740Iowa72
Franklin County10,680Iowa73
Keokuk County10,511Iowa74
Sac County10,350Iowa75
Emmet County10,302Iowa76
Humboldt County9,815Iowa77
Calhoun County9,670Iowa78
Howard County9,566Iowa79
Palo Alto County9,421Iowa80
Greene County9,336Iowa81
Clarke County9,286Iowa82
Monona County9,243Iowa83
Lucas County8,898Iowa84
Davis County8,753Iowa85
Decatur County8,457Iowa86
Monroe County7,970Iowa87
Adair County7,682Iowa88
Worth County7,598Iowa89
Van Buren County7,570Iowa90
Fremont County7,441Iowa91
Pocahontas County7,310Iowa92
Ida County7,089Iowa93
Osceola County6,462Iowa94
Wayne County6,403Iowa95
Taylor County6,317Iowa96
Audubon County6,119Iowa97
Ringgold County5,131Iowa98
Adams County4,029Iowa99