Iowa Citizen Population By County in 2016 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2016, the citizen population for Iowa was 3,012,100 and represented 96.96% of the total Iowa population.

Among all Iowa counties, Polk had the highest citizen population (435.95K), followed by Linn (213.77K), and Scott (167.59K).

In terms of percentages, Audubon had the highest percentage of its population being citizens (99.91%), followed by Davis (99.89%), and Howard (99.89%).

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 2016

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

See this for other years:

Iowa Citizen Population By County in 2016

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County	Citizen Population	% of County Population
Polk	435950	94.95
Linn	213770	98.03
Scott	167585	97.94
Johnson	131910	92.89
Black Hawk	128975	97.11
Woodbury	96665	94.38
Dubuque	95040	98.63
Pottawattamie	91180	97.83
Story	88200	93.00
Dallas	74455	95.36
Warren	47920	99.48
Clinton	47535	99.09
Cerro Gordo	42840	98.93
Muscatine	41395	96.38
Des Moines	39760	99.12
Marshall	36605	89.86
Jasper	36570	99.61
Webster	36280	97.92
Lee	34925	99.30
Wapello	33105	93.94
Marion	32975	99.34
Sioux	32940	95.15
Boone	26260	99.43
Benton	25660	99.77
Plymouth	24595	98.50
Bremer	24415	98.99
Mahaska	22070	98.86
Washington	21830	98.71
Buchanan	20920	99.48
Winneshiek	20475	98.49
Carroll	20470	99.59
Jones	20255	98.90
Fayette	20235	99.24
Henry	19630	98.45
Jackson	19470	99.69
Cedar	18320	99.62
Poweshiek	18155	97.50
Buena Vista	18055	88.31
Clayton	17570	99.07
Delaware	17315	99.26
Hardin	17050	98.41
Tama	17030	97.73
Dickinson	16940	99.38
Clay	16305	98.94
Iowa	16215	99.33
Floyd	15795	98.69
Jefferson	15780	89.35
Madison	15470	98.79
Crawford	15380	89.71
Page	15310	98.46
Kossuth	15115	99.28
Hamilton	14880	97.73
Butler	14855	99.46
Mills	14820	99.87
Harrison	14275	99.58
O'Brien	13815	98.29
Allamakee	13560	96.86
Cass	13390	99.67
Appanoose	12530	99.44
Union	12420	99.04
Grundy	12355	99.84
Wright	12340	95.73
Chickasaw	12030	98.89
Shelby	11775	98.58
Cherokee	11655	99.19
Lyon	11645	99.28
Hancock	10875	98.82
Mitchell	10715	99.63
Guthrie	10590	99.07
Louisa	10475	93.11
Winnebago	10440	98.68
Montgomery	10235	98.60
Keokuk	10175	99.41
Franklin	10165	97.79
Sac	9955	99.20
Calhoun	9840	99.65
Emmet	9575	97.51
Humboldt	9455	98.44
Howard	9420	99.89
Greene	9010	99.17
Palo Alto	8970	97.98
Monona	8935	99.11
Clarke	8875	95.69
Davis	8760	99.89
Lucas	8505	97.76
Decatur	8100	98.66
Monroe	7895	99.12
Worth	7545	99.80
Van Buren	7365	99.80
Adair	7260	99.05
Ida	7005	99.50
Fremont	6980	99.43
Pocahontas	6945	98.37
Wayne	6385	99.69
Taylor	6050	97.42
Osceola	5945	96.59
Audubon	5790	99.91
Ringgold	5030	99.51
Adams	3810	99.74