Iowa Population By County in 2022

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2022, the population of Iowa was 3,199,693. Among all Iowa counties, Polk had the highest population (501,184), followed by Linn (228,940), and Scott (173,751). Adams was the least populated county (3,601).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

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Iowa Population By County in 2022
Iowa Population By County in 2022
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County Population % of State Population
Adair 7457 0.23
Adams 3601 0.11
Allamakee 14018 0.44
Appanoose 12141 0.38
Audubon 5575 0.17
Benton 25742 0.81
Black Hawk 130052 4.07
Boone 26579 0.83
Bremer 25254 0.79
Buchanan 20689 0.65
Buena Vista 20644 0.65
Butler 14246 0.45
Calhoun 9725 0.30
Carroll 20541 0.64
Cass 13137 0.41
Cedar 18353 0.57
Cerro Gordo 42426 1.33
Cherokee 11490 0.36
Chickasaw 11728 0.37
Clarke 9643 0.30
Clay 16507 0.52
Clayton 17057 0.53
Clinton 46255 1.45
Crawford 16129 0.50
Dallas 108146 3.38
Davis 9147 0.29
Decatur 7695 0.24
Delaware 17607 0.55
Des Moines 38242 1.20
Dickinson 18048 0.56
Dubuque 98715 3.09
Emmet 9214 0.29
Fayette 19266 0.60
Floyd 15348 0.48
Franklin 9946 0.31
Fremont 6475 0.20
Greene 8710 0.27
Grundy 12355 0.39
Guthrie 10681 0.33
Hamilton 14803 0.46
Hancock 10651 0.33
Hardin 16614 0.52
Harrison 14680 0.46
Henry 20253 0.63
Howard 9509 0.30
Humboldt 9521 0.30
Ida 6905 0.22
Iowa 16497 0.52
Jackson 19346 0.61
Jasper 37949 1.19
Jefferson 15668 0.49
Johnson 156915 4.90
Jones 20949 0.66
Keokuk 9883 0.31
Kossuth 14465 0.45
Lee 32829 1.03
Linn 228940 7.16
Louisa 10617 0.33
Lucas 8702 0.27
Lyon 12177 0.38
Madison 17040 0.53
Mahaska 21971 0.69
Marion 33630 1.05
Marshall 39821 1.25
Mills 14535 0.45
Mitchell 10544 0.33
Monona 8506 0.27
Monroe 7530 0.24
Montgomery 10210 0.32
Muscatine 42395 1.33
O'Brien 14085 0.44
Osceola 6072 0.19
Page 15176 0.47
Palo Alto 8790 0.28
Plymouth 25722 0.80
Pocahontas 7073 0.22
Polk 501184 15.66
Pottawattamie 93065 2.91
Poweshiek 18518 0.58
Ringgold 4688 0.15
Sac 9689 0.30
Scott 173751 5.43
Shelby 11711 0.37
Sioux 36127 1.13
Story 98257 3.07
Tama 16943 0.53
Taylor 5875 0.18
Union 11903 0.37
Van Buren 7252 0.23
Wapello 35081 1.10
Warren 54303 1.70
Washington 22542 0.71
Wayne 6490 0.20
Webster 36652 1.15
Winnebago 10639 0.33
Winneshiek 19902 0.62
Woodbury 105558 3.30
Worth 7311 0.23
Wright 12695 0.40