Iowa Citizen Population By County in 2010 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2010, the citizen population for Iowa was 2,936,340 and represented 97.35% of the total Iowa population.

Among all Iowa counties, Polk had the highest citizen population (398.57K), followed by Linn (204.43K), and Scott (159.07K).

In terms of percentages, Adams had the highest percentage of its population being citizens (100.00%), followed by Ida (99.93%), and Iowa (99.91%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

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

You may also be interested in:
Iowa Citizen Voting-age Population By County in 2010

Data Source: US Census - ACS 5-Year (CVAP).

See this for other years:

Iowa Citizen Population By County in 2010

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County	Citizen Population	% of County Population
Polk	398565	95.06
Linn	204430	98.40
Scott	159070	98.08
Black Hawk	125815	97.34
Johnson	120265	94.70
Woodbury	96210	95.06
Dubuque	91665	99.05
Pottawattamie	90005	97.91
Story	82425	94.10
Dallas	59125	95.80
Clinton	49050	99.54
Warren	45135	99.54
Cerro Gordo	43655	98.49
Muscatine	40380	95.01
Des Moines	39830	98.92
Webster	37695	98.46
Marshall	37150	92.57
Jasper	36860	99.49
Lee	35620	98.97
Wapello	34510	97.06
Marion	33150	99.31
Sioux	31890	95.55
Boone	26325	99.62
Benton	25910	99.27
Plymouth	24770	99.34
Bremer	24000	99.24
Mahaska	22215	99.26
Washington	21210	98.08
Buchanan	20975	99.76
Fayette	20815	99.17
Winneshiek	20790	98.86
Carroll	20750	99.74
Jones	20605	99.49
Jackson	19905	99.82
Henry	19445	95.95
Poweshiek	18725	98.50
Cedar	18265	99.19
Clayton	17960	98.68
Delaware	17815	99.78
Buena Vista	17550	87.84
Tama	17540	97.72
Hardin	17535	99.15
Dickinson	16625	99.76
Clay	16460	98.45
Iowa	16340	99.91
Floyd	16230	98.99
Page	15840	98.42
Kossuth	15710	99.75
Hamilton	15560	98.02
Madison	15470	99.87
Jefferson	15345	92.19
Crawford	15330	90.44
Mills	15080	99.51
Harrison	15010	99.57
Butler	14810	99.46
O'Brien	14200	98.47
Cass	13825	98.96
Allamakee	13790	96.23
Appanoose	12995	99.73
Wright	12945	96.71
Chickasaw	12390	99.12
Grundy	12365	99.72
Union	12360	99.60
Shelby	12300	99.76
Cherokee	12000	99.30
Lyon	11520	99.61
Hancock	11355	98.70
Louisa	11075	94.78
Guthrie	10960	99.28
Mitchell	10775	99.77
Montgomery	10770	98.81
Winnebago	10715	97.77
Keokuk	10595	99.81
Sac	10370	98.95
Franklin	10295	96.26
Emmet	10095	97.16
Calhoun	9820	99.75
Humboldt	9765	98.59
Howard	9560	99.48
Palo Alto	9460	99.47
Greene	9370	99.15
Monona	9260	99.09
Lucas	8900	97.64
Clarke	8790	95.34
Davis	8670	99.83
Decatur	8320	97.77
Monroe	7825	98.80
Adair	7760	99.74
Van Buren	7625	99.74
Worth	7595	99.54
Fremont	7475	99.27
Pocahontas	7470	99.47
Ida	7165	99.93
Osceola	6405	97.41
Wayne	6310	98.52
Taylor	6295	98.36
Audubon	6170	99.76
Ringgold	5095	98.55
Adams	4125	100.00