County Census Records
Iowa Counties
99 counties with population data from the decennial US Census, 1790 to 2020.
99 counties
Population as of 2020 census
Adair
7,496
Adams
3,704
Allamakee
14,061
Appanoose
12,317
Audubon
5,674
Benton
25,575
Black Hawk
131,144
Boone
26,715
Bremer
24,988
Buchanan
20,565
Buena Vista
20,823
Butler
14,334
Calhoun
9,927
Carroll
20,760
Cass
13,127
Cedar
18,505
Cerro Gordo
43,127
Cherokee
11,658
Chickasaw
12,012
Clarke
9,748
Clay
16,384
Clayton
17,043
Clinton
46,460
Crawford
16,525
Dallas
99,678
Davis
9,110
Decatur
7,645
Delaware
17,488
Des Moines
38,910
Dickinson
17,703
Dubuque
99,266
Emmet
9,388
Fayette
19,509
Floyd
15,627
Franklin
10,019
Fremont
6,605
Greene
8,771
Grundy
12,329
Guthrie
10,623
Hamilton
15,039
Hancock
10,795
Hardin
16,878
Harrison
14,582
Henry
20,482
Howard
9,469
Humboldt
9,597
Ida
7,005
Iowa
16,662
Jackson
19,485
Jasper
37,813
Jefferson
15,663
Johnson
152,854
Jones
20,646
Keokuk
10,033
Kossuth
14,828
Lee
33,555
Linn
230,299
Louisa
10,837
Lucas
8,634
Lyon
11,934
Madison
16,548
Mahaska
22,190
Marion
33,414
Marshall
40,105
Mills
14,484
Mitchell
10,565
Monona
8,751
Monroe
7,577
Montgomery
10,330
Muscatine
43,235
O'Brien
14,182
Osceola
6,192
Page
15,211
Palo Alto
8,996
Plymouth
25,698
Pocahontas
7,078
Polk
492,401
Pottawattamie
93,667
Poweshiek
18,662
Ringgold
4,663
Sac
9,814
Scott
174,669
Shelby
11,746
Sioux
35,872
Story
98,537
Tama
17,135
Taylor
5,896
Union
12,138
Van Buren
7,203
Wapello
35,437
Warren
52,403
Washington
22,565
Wayne
6,497
Webster
36,999
Winnebago
10,679
Winneshiek
20,070
Woodbury
105,941
Worth
7,443
Wright
12,943
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