Iowa Citizen Population By County in 2023 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2023, the citizen population for Iowa was 3,095,590 and represented 96.86% of the total Iowa population.

Among all Iowa counties, Polk had the highest citizen population (471.07K), followed by Linn (223.97K), and Scott (171.04K).

In terms of percentages, Adams had the highest percentage of its population being citizens (100.00%), followed by Monroe (100.00%), and Monona (99.94%).

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 2023

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

See this for other years:

Iowa Citizen Population By County in 2023

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County	Citizen Population	% of County Population
Polk	471065	94.70
Linn	223970	97.61
Scott	171040	98.13
Johnson	145765	94.12
Black Hawk	126340	96.67
Woodbury	99565	94.14
Dallas	99000	95.07
Dubuque	96875	97.90
Story	93375	94.71
Pottawattamie	91540	98.00
Warren	53180	99.43
Clinton	46030	99.24
Cerro Gordo	42290	98.84
Muscatine	41020	95.99
Des Moines	37965	98.37
Jasper	37145	98.10
Marshall	36485	91.28
Webster	35865	97.33
Sioux	34335	95.42
Wapello	33370	94.63
Marion	33260	99.14
Lee	33125	99.85
Boone	26615	99.79
Benton	25635	99.75
Plymouth	25055	97.49
Bremer	25015	99.58
Washington	21995	97.58
Mahaska	21800	98.89
Jones	20700	99.52
Carroll	20525	99.27
Buchanan	20415	98.89
Henry	19925	98.49
Winneshiek	19650	98.40
Jackson	19380	99.74
Fayette	19145	98.71
Cedar	18255	99.08
Poweshiek	18125	97.55
Buena Vista	17890	86.49
Dickinson	17590	98.57
Delaware	17530	99.89
Clayton	16910	99.06
Madison	16695	99.61
Tama	16480	97.06
Iowa	16465	99.52
Hardin	16390	97.97
Clay	16345	99.39
Floyd	15435	99.58
Crawford	15100	92.70
Page	15085	99.44
Harrison	14600	99.69
Mills	14475	99.38
Jefferson	14315	91.32
Kossuth	14270	97.67
Butler	14150	98.95
Hamilton	14145	94.97
O'Brien	13725	97.31
Allamakee	13485	96.05
Cass	13085	99.77
Grundy	12265	99.31
Wright	12170	94.97
Appanoose	12145	99.22
Lyon	11975	99.09
Union	11965	99.38
Chickasaw	11650	98.15
Shelby	11650	99.11
Cherokee	11355	98.02
Hancock	10570	98.60
Guthrie	10500	98.64
Winnebago	10490	98.50
Mitchell	10440	98.96
Montgomery	10185	99.32
Louisa	10180	95.05
Keokuk	9905	99.40
Calhoun	9810	99.49
Sac	9575	98.11
Clarke	9490	97.94
Franklin	9430	94.54
Howard	9370	99.05
Humboldt	9285	96.97
Emmet	9110	97.80
Davis	9040	99.07
Palo Alto	8815	99.05
Greene	8645	99.14
Monona	8615	99.94
Lucas	8590	98.91
Decatur	7550	98.44
Monroe	7545	100.00
Adair	7425	99.40
Worth	7340	99.46
Van Buren	7205	99.59
Pocahontas	6895	97.94
Ida	6870	98.92
Fremont	6510	99.09
Wayne	6475	99.31
Osceola	5925	96.89
Taylor	5765	97.71
Audubon	5590	99.47
Ringgold	4645	99.57
Adams	3640	100.00