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Total Population in Iowa, by County

Total Population for every county in Iowa, ranked. The highest is Polk County at 503,175 and the lowest is Adams County at 3,622.

Iowa: 3,210,507 · United States: 334,922,499 · median county in Iowa: 15,131

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#County Total Population
1Polk County503,175
2Linn County230,004
3Scott County174,608
4Johnson County156,639
5Black Hawk County131,049
6Dallas County107,968
7Woodbury County106,247
8Story County100,466
9Dubuque County99,030
10Pottawattamie County93,424
11Warren County54,409
12Clinton County46,268
13Cerro Gordo County42,632
14Muscatine County42,559
15Marshall County40,114
16Des Moines County38,487
17Jasper County37,954
18Webster County36,886
19Sioux County36,212
20Wapello County35,362
21Marion County33,642
22Lee County32,893
23Boone County26,668
24Plymouth County25,747
25Benton County25,724
26Bremer County25,204
27Washington County22,561
28Mahaska County22,021
29Jones County20,896
30Buena Vista County20,753
31Buchanan County20,694
32Carroll County20,594
33Henry County20,004
34Winneshiek County19,873
35Jackson County19,390
36Fayette County19,288
37Poweshiek County18,545
38Cedar County18,349
39Dickinson County17,990
40Delaware County17,558
41Clayton County17,013
42Madison County16,926
43Tama County16,868
44Hardin County16,639
45Iowa County16,507
46Clay County16,461
47Crawford County16,277
48Jefferson County15,705
49Floyd County15,328
50Page County15,131
51Hamilton County14,886
52Harrison County14,632
53Mills County14,568
54Kossuth County14,516
55Butler County14,268
56O'Brien County14,126
57Allamakee County14,092
58Cass County13,096
59Wright County12,791
60Grundy County12,384
61Appanoose County12,184
62Lyon County12,162
63Union County11,993
64Chickasaw County11,807
65Shelby County11,778
66Cherokee County11,600
67Guthrie County10,688
68Louisa County10,678
69Hancock County10,671
70Winnebago County10,583
71Mitchell County10,575
72Montgomery County10,214
73Franklin County9,956
74Keokuk County9,924
75Calhoun County9,803
76Sac County9,689
77Clarke County9,662
78Humboldt County9,591
79Howard County9,445
80Emmet County9,262
81Davis County9,157
82Palo Alto County8,863
83Lucas County8,716
84Greene County8,688
85Monona County8,557
86Decatur County7,759
87Monroe County7,513
88Adair County7,460
89Worth County7,350
90Van Buren County7,241
91Pocahontas County7,046
92Ida County6,911
93Wayne County6,532
94Fremont County6,514
95Osceola County6,100
96Taylor County5,868
97Audubon County5,599
98Ringgold County4,645
99Adams County3,622

Everyone living in the area, from the 5-year American Community Survey.

Source: ACS 2020-2024 5-Year Estimates, 2024.

Iowa ranks 32nd of 52 states for total population.

Total Population in other states

Other statistics for Iowa by county