First-level division
🇺🇸 Iowa
Subdivisions
Polk
Population 492,401
Linn
Population 230,299
Scott
Population 174,669
Johnson
Population 152,854
Black Hawk County
Population 131,090
Woodbury
Population 105,941
Dallas
Population 99,678
Dubuque
Population 99,266
Pottawattamie
Population 93,667
Story
Population 89,542
Clinton
Population 46,460
Warren
Population 46,225
Cerro Gordo
Population 44,151
Muscatine
Population 43,235
Des Moines
Population 40,325
Marshall
Population 40,105
Jasper
Population 37,813
Webster
Population 36,999
Sioux
Population 35,872
Wapello
Population 35,437
Lee
Population 33,555
Marion
Population 33,414
Boone
Population 26,715
Plymouth
Population 25,698
Benton
Population 25,575
Bremer
Population 24,988
Washington
Population 22,565
Mahaska
Population 22,190
Carroll
Population 20,760
Jones
Population 20,646
Buchanan
Population 20,565
Henry
Population 20,482
Buena Vista
Population 20,260
Winneshiek
Population 20,070
Fayette
Population 19,509
Jackson
Population 19,485
Poweshiek
Population 18,662
Cedar
Population 18,505
Dickinson
Population 17,703
Delaware
Population 17,488
Tama
Population 17,135
Clayton
Population 17,043
Hardin
Population 16,878
Iowa
Population 16,662
Crawford
Population 16,525
Clay
Population 16,384
Madison
Population 15,679
Jefferson
Population 15,663
Floyd
Population 15,627
Page
Population 15,211
Hamilton
Population 15,039
Butler
Population 14,867
Kossuth
Population 14,828
Harrison
Population 14,582
Mills
Population 14,484
O'Brien
Population 14,182
Allamakee
Population 14,061
Cass
Population 13,127
Wright
Population 12,943
Grundy
Population 12,329
Appanoose
Population 12,317
Union
Population 12,138
Chickasaw
Population 12,012
Lyon
Population 11,934
Shelby
Population 11,746
Cherokee
Population 11,658
Louisa
Population 10,837
Hancock
Population 10,795
Winnebago
Population 10,679
Guthrie
Population 10,623
Mitchell
Population 10,565
Montgomery
Population 10,330
Keokuk
Population 10,033
Franklin
Population 10,019
Calhoun
Population 9,927
Sac
Population 9,814
Clarke
Population 9,748
Humboldt
Population 9,597
Howard
Population 9,469
Palo Alto
Population 9,421
Emmet
Population 9,388
Davis
Population 9,110
Greene
Population 8,771
Monona
Population 8,751
Lucas
Population 8,634
Decatur
Population 7,645
Monroe
Population 7,577
Van Buren
Population 7,570
Adair
Population 7,496
Worth
Population 7,443
Pocahontas
Population 7,078
Ida
Population 7,005
Fremont
Population 6,605
Wayne
Population 6,497
Osceola
Population 6,192
Taylor
Population 5,896
Audubon
Population 5,674
Ringgold
Population 4,663
Adams
Population 3,704