Iowa Citizen Population By County in 2011 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2011, the citizen population for Iowa was 2,951,200 and represented 97.33% of the total Iowa population.

Among all Iowa counties, Polk had the highest citizen population (404.30K), followed by Linn (206.69K), and Scott (160.73K).

In terms of percentages, Ida had the highest percentage of its population being citizens (100.00%), followed by Iowa (99.94%), and Van Buren (99.93%).

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 2011

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

See this for other years:

Iowa Citizen Population By County in 2011

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County	Citizen Population	% of County Population
Polk	404300	95.00
Linn	206690	98.42
Scott	160730	98.21
Black Hawk	126560	97.31
Johnson	121880	94.36
Woodbury	96560	95.07
Dubuque	92380	99.09
Pottawattamie	90720	98.11
Story	83425	94.19
Dallas	61730	95.88
Clinton	48890	99.40
Warren	45680	99.61
Cerro Gordo	43545	98.51
Muscatine	40935	96.01
Des Moines	39860	99.02
Webster	37535	98.50
Marshall	37020	91.63
Jasper	36720	99.51
Lee	35495	99.00
Wapello	34140	96.24
Marion	33035	99.00
Sioux	31870	95.01
Boone	26320	99.77
Benton	25885	99.21
Plymouth	24730	99.26
Bremer	24015	99.11
Mahaska	22235	99.11
Washington	21295	98.11
Buchanan	20980	99.81
Fayette	20815	99.40
Carroll	20780	99.86
Winneshiek	20760	98.69
Jones	20605	99.54
Jackson	19825	99.70
Henry	19610	96.82
Poweshiek	18745	98.84
Cedar	18315	99.40
Clayton	17930	98.79
Buena Vista	17725	88.27
Delaware	17690	99.35
Tama	17470	97.79
Hardin	17425	99.03
Dickinson	16665	99.73
Clay	16460	98.71
Iowa	16330	99.94
Floyd	16115	98.93
Page	15730	98.13
Kossuth	15575	99.71
Madison	15555	99.78
Jefferson	15500	92.70
Hamilton	15455	98.10
Crawford	15205	89.26
Mills	15020	99.40
Harrison	14930	99.73
Butler	14810	99.43
O'Brien	14130	98.47
Cass	13845	99.39
Allamakee	13750	96.09
Appanoose	12875	99.61
Wright	12755	96.05
Union	12440	99.76
Grundy	12380	99.80
Chickasaw	12355	99.08
Shelby	12210	99.76
Cherokee	11965	99.21
Lyon	11530	99.57
Hancock	11245	98.51
Louisa	11015	95.16
Guthrie	10905	99.23
Mitchell	10755	99.63
Winnebago	10705	98.30
Montgomery	10665	98.84
Keokuk	10525	99.76
Sac	10305	99.18
Franklin	10205	95.33
Emmet	10070	97.53
Calhoun	9735	99.80
Humboldt	9690	98.28
Howard	9550	99.58
Palo Alto	9405	99.21
Greene	9295	99.09
Monona	9245	99.41
Clarke	8780	94.92
Lucas	8740	96.90
Davis	8705	99.77
Decatur	8355	98.88
Monroe	7815	98.30
Adair	7680	99.74
Van Buren	7610	99.93
Worth	7570	99.54
Fremont	7435	99.47
Pocahontas	7375	99.60
Ida	7140	100.00
Wayne	6360	99.84
Osceola	6325	97.23
Taylor	6255	98.43
Audubon	6130	99.84
Ringgold	5080	98.64
Adams	4080	99.88