Iowa Citizen Population By County in 2019 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2019, the citizen population for Iowa was 3,039,680 and represented 96.82% of the total Iowa population.

Among all Iowa counties, Polk had the highest citizen population (454.58K), followed by Linn (218.10K), and Scott (168.63K).

In terms of percentages, Monona had the highest percentage of its population being citizens (99.94%), followed by Monroe (99.94%), and Grundy (99.84%).

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 2019

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

See this for other years:

Iowa Citizen Population By County in 2019

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County	Citizen Population	% of County Population
Polk	454580	94.78
Linn	218100	97.43
Scott	168625	97.79
Johnson	136175	91.65
Black Hawk	127460	96.27
Woodbury	98745	96.26
Dubuque	95355	98.32
Pottawattamie	91240	97.69
Story	89990	92.83
Dallas	83605	95.99
Warren	49800	99.45
Clinton	46595	99.33
Cerro Gordo	42385	98.95
Muscatine	41455	96.65
Des Moines	38980	98.97
Jasper	36715	99.31
Marshall	36245	90.69
Webster	35900	98.24
Lee	34105	99.65
Wapello	33415	95.09
Sioux	33320	95.68
Marion	32940	99.31
Boone	26205	99.37
Benton	25535	99.61
Bremer	24675	99.24
Plymouth	24570	98.01
Mahaska	21895	98.78
Washington	21610	97.78
Buchanan	21045	99.65
Jones	20420	99.32
Carroll	20120	99.21
Winneshiek	20000	98.72
Fayette	19685	99.39
Henry	19575	98.17
Jackson	19255	99.25
Cedar	18345	99.40
Poweshiek	18020	97.99
Clayton	17385	98.64
Buena Vista	17275	86.12
Delaware	17110	99.56
Dickinson	16955	99.01
Hardin	16800	98.48
Jefferson	16800	92.56
Tama	16560	97.24
Iowa	16110	99.51
Clay	15955	98.43
Madison	15880	99.19
Floyd	15655	99.18
Page	15040	98.49
Mills	14930	99.30
Kossuth	14855	99.17
Crawford	14735	86.50
Hamilton	14685	97.93
Butler	14605	99.83
Harrison	14045	99.68
O'Brien	13670	98.81
Allamakee	13405	97.03
Cass	12935	98.82
Appanoose	12385	99.48
Grundy	12280	99.84
Wright	12265	96.27
Union	12220	98.87
Chickasaw	11875	98.75
Lyon	11630	98.77
Shelby	11485	98.97
Cherokee	11255	99.21
Hancock	10680	98.89
Mitchell	10540	99.34
Guthrie	10500	98.41
Louisa	10465	93.61
Winnebago	10435	99.05
Keokuk	10105	99.17
Montgomery	9915	98.61
Franklin	9845	96.90
Sac	9710	99.08
Calhoun	9690	99.44
Humboldt	9375	98.12
Howard	9185	99.57
Emmet	9180	97.25
Clarke	8940	95.51
Davis	8895	99.72
Greene	8885	99.27
Palo Alto	8810	97.84
Monona	8725	99.94
Lucas	8445	98.37
Decatur	7845	98.31
Monroe	7800	99.94
Worth	7425	99.73
Van Buren	7135	99.79
Adair	7000	98.80
Fremont	6885	99.14
Ida	6850	99.28
Pocahontas	6625	97.50
Wayne	6395	99.46
Taylor	5990	97.16
Osceola	5830	96.36
Audubon	5560	99.82
Ringgold	4900	98.69
Adams	3660	99.73