Iowa Population By County in 2012

Updated on January 29, 2024.

Based on the US Census Vintage data estimates, in 2012, the population of Iowa was 3,076,844. Among all Iowa counties, Polk had the highest population (444,753), followed by Linn (215,542), and Scott (168,433). Adams was the least populated county (3,910).

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 2012
Iowa Population By County in 2012
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County Population % of State Population
Adair 7466 0.24
Adams 3910 0.13
Allamakee 14150 0.46
Appanoose 12713 0.41
Audubon 5861 0.19
Benton 25829 0.84
Black Hawk 131904 4.29
Boone 26138 0.85
Bremer 24499 0.80
Buchanan 20995 0.68
Buena Vista 20558 0.67
Butler 14972 0.49
Calhoun 9912 0.32
Carroll 20653 0.67
Cass 13697 0.45
Cedar 18299 0.60
Cerro Gordo 43704 1.42
Cherokee 11954 0.39
Chickasaw 12289 0.40
Clarke 9339 0.30
Clay 16540 0.54
Clayton 17947 0.58
Clinton 48711 1.58
Crawford 17292 0.56
Dallas 72248 2.35
Davis 8705 0.28
Decatur 8241 0.27
Delaware 17568 0.57
Des Moines 40247 1.31
Dickinson 16929 0.55
Dubuque 95183 3.09
Emmet 9949 0.32
Fayette 20773 0.68
Floyd 16090 0.52
Franklin 10509 0.34
Fremont 7140 0.23
Greene 9181 0.30
Grundy 12437 0.40
Guthrie 10768 0.35
Hamilton 15321 0.50
Hancock 11180 0.36
Hardin 17360 0.56
Harrison 14474 0.47
Henry 20003 0.65
Howard 9550 0.31
Humboldt 9724 0.32
Ida 7045 0.23
Iowa 16183 0.53
Jackson 19684 0.64
Jasper 36583 1.19
Jefferson 17281 0.56
Johnson 137180 4.46
Jones 20602 0.67
Keokuk 10427 0.34
Kossuth 15407 0.50
Lee 35549 1.16
Linn 215542 7.01
Louisa 11364 0.37
Lucas 8777 0.28
Lyon 11761 0.38
Madison 15639 0.51
Mahaska 22407 0.73
Marion 33277 1.08
Marshall 41032 1.33
Mills 14874 0.48
Mitchell 10714 0.35
Monona 9090 0.30
Monroe 8070 0.26
Montgomery 10541 0.34
Muscatine 42922 1.40
O'Brien 14154 0.46
Osceola 6203 0.20
Page 15705 0.51
Palo Alto 9278 0.30
Plymouth 24836 0.81
Pocahontas 7143 0.23
Polk 444753 14.46
Pottawattamie 92965 3.02
Poweshiek 18734 0.61
Ringgold 5025 0.16
Sac 10161 0.33
Scott 168433 5.47
Shelby 12032 0.39
Sioux 34289 1.11
Story 92046 2.99
Tama 17500 0.57
Taylor 6259 0.20
Union 12585 0.41
Van Buren 7449 0.24
Wapello 35430 1.15
Warren 46906 1.52
Washington 21910 0.71
Wayne 6329 0.21
Webster 37335 1.21
Winnebago 10608 0.35
Winneshiek 21048 0.68
Woodbury 102351 3.33
Worth 7495 0.24
Wright 13019 0.42