Iowa Citizen Population By County in 2014 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2014, the citizen population for Iowa was 2,988,425 and represented 97.09% of the total Iowa population.

Among all Iowa counties, Polk had the highest citizen population (422.40K), followed by Linn (211.02K), and Scott (165.84K).

In terms of percentages, Adams had the highest percentage of its population being citizens (100.00%), followed by Howard (99.95%), and Davis (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 2014

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

See this for other years:

Iowa Citizen Population By County in 2014

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County	Citizen Population	% of County Population
Polk	422400	94.89
Linn	211020	98.18
Scott	165840	98.30
Black Hawk	128395	97.31
Johnson	127750	93.39
Woodbury	96235	94.01
Dubuque	94070	98.85
Pottawattamie	91425	98.14
Story	85790	93.31
Dallas	68835	95.44
Clinton	48080	98.80
Warren	46830	99.51
Cerro Gordo	43200	98.85
Muscatine	41375	96.55
Des Moines	40010	99.37
Marshall	37010	90.45
Webster	36740	98.24
Jasper	36505	99.43
Lee	35185	98.97
Wapello	33450	94.48
Marion	33010	99.10
Sioux	32650	95.30
Boone	26245	99.70
Benton	25720	99.32
Plymouth	24615	98.86
Bremer	24310	99.31
Mahaska	22275	99.35
Washington	21555	98.40
Buchanan	20855	99.57
Carroll	20660	99.81
Winneshiek	20645	98.52
Fayette	20540	99.25
Jones	20425	99.13
Henry	19965	98.86
Jackson	19600	99.72
Poweshiek	18380	97.95
Cedar	18360	99.59
Buena Vista	18100	88.47
Clayton	17710	98.94
Delaware	17500	99.55
Tama	17225	98.04
Hardin	17170	98.65
Dickinson	16770	99.38
Clay	16365	98.85
Iowa	16240	99.54
Floyd	16045	99.32
Page	15545	98.79
Madison	15520	99.30
Crawford	15450	89.51
Kossuth	15280	99.58
Hamilton	15170	98.73
Jefferson	15160	88.66
Mills	14920	99.83
Butler	14895	99.53
Harrison	14525	99.49
O'Brien	13910	98.13
Allamakee	13715	96.93
Cass	13630	99.53
Appanoose	12715	99.69
Wright	12480	95.96
Union	12445	99.12
Grundy	12375	99.76
Chickasaw	12195	98.91
Cherokee	11910	99.42
Shelby	11900	98.88
Lyon	11590	99.23
Hancock	11025	98.66
Guthrie	10705	99.17
Mitchell	10690	99.49
Louisa	10620	93.94
Winnebago	10445	98.12
Montgomery	10435	98.91
Keokuk	10330	99.71
Franklin	10305	97.49
Sac	10075	99.16
Calhoun	9960	99.80
Emmet	9650	95.83
Humboldt	9560	98.25
Howard	9525	99.95
Greene	9165	99.30
Palo Alto	9085	98.06
Monona	9075	99.18
Clarke	8940	96.28
Davis	8760	99.94
Lucas	8345	94.99
Decatur	8185	98.79
Monroe	7870	98.13
Worth	7550	99.80
Adair	7495	99.34
Van Buren	7475	99.87
Fremont	7170	99.58
Pocahontas	7120	99.03
Ida	7080	99.93
Wayne	6375	99.84
Osceola	6050	96.34
Taylor	6045	97.11
Audubon	5930	99.92
Ringgold	5050	99.41
Adams	3935	100.00