Iowa Citizen Population By County in 2012 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2012, the citizen population for Iowa was 2,964,950 and represented 97.29% of the total Iowa population.

Among all Iowa counties, Polk had the highest citizen population (410.72K), followed by Linn (208.73K), and Scott (162.35K).

In terms of percentages, Adams had the highest percentage of its population being citizens (100.00%), followed by Audubon (100.00%), and Ida (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 2012

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

See this for other years:

Iowa Citizen Population By County in 2012

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County	Citizen Population	% of County Population
Polk	410720	95.12
Linn	208730	98.48
Scott	162345	98.14
Black Hawk	127515	97.46
Johnson	123400	93.75
Woodbury	96650	94.80
Dubuque	92805	98.97
Pottawattamie	90980	98.04
Story	84195	93.83
Dallas	64695	96.57
Clinton	48780	99.40
Warren	46075	99.64
Cerro Gordo	43425	98.50
Muscatine	40990	95.93
Des Moines	39920	99.13
Webster	37330	98.51
Marshall	36805	90.72
Jasper	36635	99.48
Lee	35385	99.01
Wapello	33975	95.84
Marion	33030	98.92
Sioux	32155	95.20
Boone	26260	99.75
Benton	25830	99.18
Plymouth	24695	99.14
Bremer	24170	99.49
Mahaska	22215	99.04
Washington	21385	98.25
Buchanan	20910	99.62
Fayette	20800	99.55
Winneshiek	20795	98.86
Carroll	20720	99.86
Jones	20600	99.59
Jackson	19750	99.72
Henry	19555	96.62
Poweshiek	18660	98.78
Cedar	18315	99.30
Buena Vista	18010	89.09
Clayton	17875	99.00
Delaware	17640	99.55
Tama	17370	97.89
Hardin	17280	98.86
Dickinson	16710	99.58
Clay	16430	98.68
Iowa	16280	99.76
Floyd	16035	98.95
Page	15665	98.52
Madison	15545	99.46
Jefferson	15505	92.35
Kossuth	15440	99.55
Hamilton	15280	97.86
Crawford	15200	88.89
Mills	14965	99.57
Butler	14840	99.60
Harrison	14810	99.80
O'Brien	14105	98.64
Cass	13770	99.32
Allamakee	13735	96.15
Appanoose	12820	99.69
Wright	12615	95.75
Union	12430	99.24
Grundy	12405	99.80
Chickasaw	12290	99.03
Shelby	12145	99.88
Cherokee	11955	99.54
Lyon	11550	99.36
Hancock	11200	98.94
Louisa	10890	95.11
Guthrie	10835	99.27
Mitchell	10715	99.58
Winnebago	10640	98.52
Montgomery	10565	98.65
Keokuk	10455	99.76
Franklin	10230	96.06
Sac	10225	99.22
Calhoun	9915	99.80
Emmet	9890	96.35
Humboldt	9645	98.22
Howard	9550	99.79
Palo Alto	9305	98.99
Greene	9200	98.87
Monona	9170	99.24
Clarke	8970	96.61
Davis	8700	99.77
Lucas	8555	95.96
Decatur	8275	98.75
Monroe	7795	97.68
Adair	7595	99.54
Van Buren	7545	99.74
Worth	7540	99.47
Fremont	7355	99.73
Pocahontas	7255	99.32
Ida	7110	99.93
Wayne	6360	99.84
Osceola	6220	96.96
Taylor	6135	97.54
Audubon	6075	100.00
Ringgold	5095	99.42
Adams	4025	100.00