Iowa Citizen Population By County in 2017 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2017, the citizen population for Iowa was 3,020,835 and represented 96.88% of the total Iowa population.

Among all Iowa counties, Polk had the highest citizen population (443.34K), followed by Linn (214.58K), and Scott (168.12K).

In terms of percentages, Cedar had the highest percentage of its population being citizens (99.95%), followed by Howard (99.95%), 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 2017

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

See this for other years:

Iowa Citizen Population By County in 2017

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County	Citizen Population	% of County Population
Polk	443340	94.89
Linn	214580	97.53
Scott	168115	98.03
Johnson	134055	92.82
Black Hawk	128885	96.94
Woodbury	97095	94.82
Dubuque	95090	98.47
Pottawattamie	91140	97.70
Story	88815	92.62
Dallas	77010	95.23
Warren	48375	99.48
Clinton	47080	98.94
Cerro Gordo	42665	98.91
Muscatine	41410	96.47
Des Moines	39470	98.98
Marshall	36770	90.85
Jasper	36575	99.42
Webster	36160	97.88
Lee	34645	99.60
Wapello	33425	94.64
Sioux	33060	95.30
Marion	32930	99.41
Boone	26195	99.30
Benton	25550	99.63
Plymouth	24715	98.76
Bremer	24460	98.87
Mahaska	21995	98.63
Washington	21780	98.57
Buchanan	20980	99.43
Jones	20325	99.29
Carroll	20320	99.46
Winneshiek	20240	98.37
Fayette	19965	99.13
Henry	19590	98.62
Jackson	19345	99.67
Cedar	18360	99.95
Poweshiek	17980	97.56
Buena Vista	17775	87.26
Clayton	17540	99.04
Delaware	17215	99.37
Hardin	16965	98.41
Dickinson	16910	99.47
Tama	16805	97.51
Jefferson	16255	90.58
Clay	16230	99.05
Iowa	16135	99.42
Floyd	15705	98.74
Madison	15615	99.33
Page	15200	98.73
Kossuth	15080	99.44
Crawford	14950	87.27
Hamilton	14940	98.29
Mills	14865	99.53
Butler	14755	99.56
Harrison	14155	99.72
O'Brien	13675	98.06
Allamakee	13500	96.84
Cass	13255	99.48
Appanoose	12470	99.40
Union	12360	98.92
Wright	12350	96.00
Grundy	12335	99.84
Chickasaw	11985	98.72
Lyon	11630	99.02
Shelby	11595	98.51
Cherokee	11475	99.14
Hancock	10840	98.82
Mitchell	10630	99.67
Guthrie	10570	99.11
Winnebago	10390	98.53
Louisa	10385	92.39
Keokuk	10160	99.36
Montgomery	10105	98.68
Franklin	10050	97.34
Sac	9850	99.14
Calhoun	9775	99.59
Humboldt	9370	97.76
Emmet	9315	96.43
Howard	9315	99.95
Greene	8905	98.45
Palo Alto	8855	97.20
Monona	8830	99.61
Davis	8815	99.77
Clarke	8795	94.93
Lucas	8445	98.20
Decatur	7970	98.33
Monroe	7810	98.74
Worth	7480	99.73
Van Buren	7305	99.93
Adair	7120	99.03
Fremont	6920	99.07
Ida	6910	99.21
Pocahontas	6845	98.21
Wayne	6390	99.77
Taylor	6110	98.31
Osceola	5930	96.42
Audubon	5695	99.74
Ringgold	4955	99.40
Adams	3780	99.87