Iowa Population By County in 2016

Updated on January 29, 2024.

Based on the US Census Vintage data estimates, in 2016, the population of Iowa was 3,133,210. Among all Iowa counties, Polk had the highest population (474,593), followed by Linn (222,299), and Scott (172,361). Adams was the least populated county (3,690).

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 2016
Iowa Population By County in 2016
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County Population % of State Population
Adair 7006 0.22
Adams 3690 0.12
Allamakee 13847 0.44
Appanoose 12515 0.40
Audubon 5625 0.18
Benton 25634 0.82
Black Hawk 133144 4.25
Boone 26434 0.84
Bremer 24796 0.79
Buchanan 20999 0.67
Buena Vista 20327 0.65
Butler 14694 0.47
Calhoun 9808 0.31
Carroll 20362 0.65
Cass 13198 0.42
Cedar 18351 0.59
Cerro Gordo 43107 1.38
Cherokee 11386 0.36
Chickasaw 12098 0.39
Clarke 9293 0.30
Clay 16301 0.52
Clayton 17657 0.56
Clinton 47285 1.51
Crawford 17107 0.55
Dallas 84278 2.69
Davis 8893 0.28
Decatur 8061 0.26
Delaware 17289 0.55
Des Moines 39719 1.27
Dickinson 17135 0.55
Dubuque 96819 3.09
Emmet 9588 0.31
Fayette 19858 0.63
Floyd 15870 0.51
Franklin 10173 0.33
Fremont 6945 0.22
Greene 9011 0.29
Grundy 12303 0.39
Guthrie 10661 0.34
Hamilton 15090 0.48
Hancock 10887 0.35
Hardin 17193 0.55
Harrison 14051 0.45
Henry 19842 0.63
Howard 9261 0.30
Humboldt 9530 0.30
Ida 6960 0.22
Iowa 16202 0.52
Jackson 19406 0.62
Jasper 36722 1.17
Jefferson 18027 0.57
Johnson 147167 4.70
Jones 20385 0.65
Keokuk 10171 0.33
Kossuth 15104 0.48
Lee 34441 1.10
Linn 222299 7.10
Louisa 11219 0.36
Lucas 8565 0.27
Lyon 11800 0.38
Madison 15800 0.50
Mahaska 22325 0.71
Marion 33157 1.06
Marshall 40122 1.28
Mills 15041 0.48
Mitchell 10650 0.34
Monona 8779 0.28
Monroe 7835 0.25
Montgomery 10135 0.32
Muscatine 42942 1.37
O'Brien 13921 0.44
Osceola 6089 0.19
Page 15343 0.49
Palo Alto 9032 0.29
Plymouth 25207 0.81
Pocahontas 6845 0.22
Polk 474593 15.15
Pottawattamie 93649 2.99
Poweshiek 18297 0.58
Ringgold 4994 0.16
Sac 9804 0.31
Scott 172361 5.50
Shelby 11662 0.37
Sioux 34955 1.12
Story 97012 3.10
Tama 17212 0.55
Taylor 6219 0.20
Union 12366 0.40
Van Buren 7243 0.23
Wapello 35270 1.13
Warren 49383 1.58
Washington 22147 0.71
Wayne 6438 0.21
Webster 36813 1.18
Winnebago 10599 0.34
Winneshiek 20432 0.65
Woodbury 102654 3.28
Worth 7470 0.24
Wright 12825 0.41