Iowa Population By County in 2014

Updated on June 16, 2025.

Based on the US Census Vintage data estimates, in 2014, the population of Iowa was 3,110,643. Among all Iowa counties, Polk had the highest population (461,069), followed by Linn (218,223), and Scott (171,457).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

Related Topics: Iowa Census Vintage Data Topic List.

Data Source: US Census Bureau (Vintage).

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Iowa Population By County in 2014

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County	Population	% of State Population
Adair	7365	0.24
Adams	3874	0.13
Allamakee	14067	0.45
Appanoose	12678	0.41
Audubon	5768	0.19
Benton	25620	0.82
Black Hawk	133433	4.29
Boone	26303	0.85
Bremer	24678	0.79
Buchanan	21135	0.68
Buena Vista	20608	0.66
Butler	14958	0.48
Calhoun	9845	0.32
Carroll	20495	0.66
Cass	13394	0.43
Cedar	18278	0.59
Cerro Gordo	43224	1.39
Cherokee	11803	0.38
Chickasaw	12250	0.39
Clarke	9192	0.30
Clay	16483	0.53
Clayton	17771	0.57
Clinton	47921	1.54
Crawford	17156	0.55
Dallas	77758	2.50
Davis	8755	0.28
Decatur	8216	0.26
Delaware	17397	0.56
Des Moines	40127	1.29
Dickinson	16845	0.54
Dubuque	96544	3.10
Emmet	9830	0.32
Fayette	20288	0.65
Floyd	16008	0.52
Franklin	10433	0.34
Fremont	7029	0.23
Greene	9127	0.29
Grundy	12388	0.40
Guthrie	10690	0.34
Hamilton	15222	0.49
Hancock	11043	0.36
Hardin	17338	0.56
Harrison	14268	0.46
Henry	19846	0.64
Howard	9357	0.30
Humboldt	9641	0.31
Ida	6971	0.22
Iowa	16325	0.53
Jackson	19430	0.63
Jasper	36891	1.19
Jefferson	17795	0.57
Johnson	142874	4.59
Jones	20553	0.66
Keokuk	10282	0.33
Kossuth	15221	0.49
Lee	35077	1.13
Linn	218223	7.02
Louisa	11254	0.36
Lucas	8633	0.28
Lyon	11709	0.38
Madison	15620	0.50
Mahaska	22466	0.72
Marion	33280	1.07
Marshall	40712	1.31
Mills	14763	0.48
Mitchell	10694	0.34
Monona	8898	0.29
Monroe	7952	0.26
Montgomery	10386	0.33
Muscatine	43032	1.38
O'Brien	14045	0.45
Osceola	6231	0.20
Page	15487	0.50
Palo Alto	9120	0.29
Plymouth	24918	0.80
Pocahontas	7099	0.23
Polk	461069	14.82
Pottawattamie	93332	3.00
Poweshiek	18624	0.60
Ringgold	4961	0.16
Sac	10046	0.32
Scott	171457	5.51
Shelby	11886	0.38
Sioux	34648	1.11
Story	95894	3.08
Tama	17309	0.56
Taylor	6172	0.20
Union	12625	0.41
Van Buren	7390	0.24
Wapello	35421	1.14
Warren	47848	1.54
Washington	22040	0.71
Wayne	6375	0.21
Webster	37085	1.19
Winnebago	10567	0.34
Winneshiek	20708	0.67
Woodbury	102333	3.29
Worth	7558	0.24
Wright	12905	0.42