Iowa library
Iowa Counties
99 counties, each with its judicial district and prosecuting office.
- Polk County, Iowapop. 492,401
- Linn County, Iowapop. 230,299
- Scott County, Iowapop. 174,669
- Johnson County, Iowapop. 152,854
- Black Hawk County, Iowapop. 131,144
- Woodbury County, Iowapop. 105,941
- Dallas County, Iowapop. 99,678
- Dubuque County, Iowapop. 99,266
- Story County, Iowapop. 98,537
- Pottawattamie County, Iowapop. 93,667
- Warren County, Iowapop. 52,403
- Clinton County, Iowapop. 46,460
- Muscatine County, Iowapop. 43,235
- Cerro Gordo County, Iowapop. 43,127
- Marshall County, Iowapop. 40,105
- Des Moines County, Iowapop. 38,910
- Jasper County, Iowapop. 37,813
- Webster County, Iowapop. 36,999
- Sioux County, Iowapop. 35,872
- Wapello County, Iowapop. 35,437
- Lee County, Iowapop. 33,555
- Marion County, Iowapop. 33,414
- Boone County, Iowapop. 26,715
- Plymouth County, Iowapop. 25,698
- Benton County, Iowapop. 25,575
- Bremer County, Iowapop. 24,988
- Washington County, Iowapop. 22,565
- Mahaska County, Iowapop. 22,190
- Buena Vista County, Iowapop. 20,823
- Carroll County, Iowapop. 20,760
- Jones County, Iowapop. 20,646
- Buchanan County, Iowapop. 20,565
- Henry County, Iowapop. 20,482
- Winneshiek County, Iowapop. 20,070
- Fayette County, Iowapop. 19,509
- Jackson County, Iowapop. 19,485
- Poweshiek County, Iowapop. 18,662
- Cedar County, Iowapop. 18,505
- Dickinson County, Iowapop. 17,703
- Delaware County, Iowapop. 17,488
- Tama County, Iowapop. 17,135
- Clayton County, Iowapop. 17,043
- Hardin County, Iowapop. 16,878
- Iowa County, Iowapop. 16,662
- Madison County, Iowapop. 16,548
- Crawford County, Iowapop. 16,525
- Clay County, Iowapop. 16,384
- Jefferson County, Iowapop. 15,663
- Floyd County, Iowapop. 15,627
- Page County, Iowapop. 15,211
- Hamilton County, Iowapop. 15,039
- Kossuth County, Iowapop. 14,828
- Harrison County, Iowapop. 14,582
- Mills County, Iowapop. 14,484
- Butler County, Iowapop. 14,334
- O'Brien County, Iowapop. 14,182
- Allamakee County, Iowapop. 14,061
- Cass County, Iowapop. 13,127
- Wright County, Iowapop. 12,943
- Grundy County, Iowapop. 12,329
- Appanoose County, Iowapop. 12,317
- Union County, Iowapop. 12,138
- Chickasaw County, Iowapop. 12,012
- Lyon County, Iowapop. 11,934
- Shelby County, Iowapop. 11,746
- Cherokee County, Iowapop. 11,658
- Louisa County, Iowapop. 10,837
- Hancock County, Iowapop. 10,795
- Winnebago County, Iowapop. 10,679
- Guthrie County, Iowapop. 10,623
- Mitchell County, Iowapop. 10,565
- Montgomery County, Iowapop. 10,330
- Keokuk County, Iowapop. 10,033
- Franklin County, Iowapop. 10,019
- Calhoun County, Iowapop. 9,927
- Sac County, Iowapop. 9,814
- Clarke County, Iowapop. 9,748
- Humboldt County, Iowapop. 9,597
- Howard County, Iowapop. 9,469
- Emmet County, Iowapop. 9,388
- Davis County, Iowapop. 9,110
- Palo Alto County, Iowapop. 8,996
- Greene County, Iowapop. 8,771
- Monona County, Iowapop. 8,751
- Lucas County, Iowapop. 8,634
- Decatur County, Iowapop. 7,645
- Monroe County, Iowapop. 7,577
- Adair County, Iowapop. 7,496
- Worth County, Iowapop. 7,443
- Van Buren County, Iowapop. 7,203
- Pocahontas County, Iowapop. 7,078
- Ida County, Iowapop. 7,005
- Fremont County, Iowapop. 6,605
- Wayne County, Iowapop. 6,497
- Osceola County, Iowapop. 6,192
- Taylor County, Iowapop. 5,896
- Audubon County, Iowapop. 5,674
- Ringgold County, Iowapop. 4,663
- Adams County, Iowapop. 3,704