Population of Iowa 2021

Population

Iowa has 3,002,555 residents (as of 2008), of which 93.0 percent are white, 2.3 percent black or African-American, 3.8 percent Hispanic or Latino, 1.5 percent Asian-American and 0.3 percent Indian.

Most of the residents of Iowa have European ancestry. With 41 percent, people of German origin form by far the largest group.

Leading the way in civil rights

Iowa has always been a pioneer in the granting of civil rights. As early as 1839, the Iowa Supreme Court, the highest court in the state, declared slavery unlawful, decades before it was resolved nationally in the wake of the Civil War.

In 1868 the court ruled that forms of segregation, such as racial segregation in schools, were not permitted in Iowa, while the US Supreme Court did not pass a corresponding judgment until 1953. In 1873 the Iowa Supreme Court ruled that racial discrimination in public institutions was against the law, nearly a hundred years before the national court ruled.

In 1869, Iowa became the first state to allow women access to law professions.

In 2009, the Iowa Supreme Court unanimously ruled that a state law prohibiting homosexual marriage violates the constitutional principle of equality and is therefore void. This made Iowa the third state after Massachusetts and Connecticut in which same-sex partners are allowed to marry.

Top Counties by Population in Iowa

Rank County Name Population Population Density (per kmĀ²)
1 Polk County 430,651 291.77
2 Linn County 211,237 113.57
3 Scott County 165,235 139.32
4 Black Hawk County 131,101 89.25
5 Johnson County 130,893 82.32
6 Woodbury County 102,183 45.19
7 Dubuque County 93,664 59.47
8 Pottawattamie County 93,169 37.70
9 Story County 89,553 60.35
10 Dallas County 66,146 43.57
11 Clinton County 49,127 27.29
12 Warren County 46,236 31.22
13 Cerro Gordo County 44,162 30.02
14 Muscatine County 42,756 37.60
15 Marshall County 40,659 27.45
16 Des Moines County 40,336 37.45
17 Webster County 38,024 20.53
18 Jasper County 36,853 19.49
19 Lee County 35,873 26.79
20 Wapello County 35,636 31.85
21 Sioux County 33,715 16.95
22 Marion County 33,320 23.22
23 Boone County 26,317 17.77
24 Benton County 26,087 14.07
25 Plymouth County 24,997 11.17
26 Bremer County 24,287 21.90
27 Mahaska County 22,392 15.14
28 Washington County 21,715 14.73
29 Winneshiek County 21,067 11.79
30 Buchanan County 20,969 14.18
31 Fayette County 20,891 11.04
32 Carroll County 20,827 14.13
33 Jones County 20,649 13.87
34 Buena Vista County 20,271 13.61
35 Henry County 20,156 17.93
36 Jackson County 19,859 12.06
37 Poweshiek County 18,925 12.49
38 Cedar County 18,510 12.32
39 Clayton County 18,140 8.99
40 Tama County 17,778 9.52
41 Delaware County 17,775 11.87
42 Hardin County 17,545 11.90
43 Crawford County 17,107 9.25
44 Jefferson County 16,854 14.95
45 Clay County 16,678 11.31
46 Dickinson County 16,678 16.90
47 Iowa County 16,366 10.78
48 Floyd County 16,314 12.57
49 Page County 15,943 11.50
50 Madison County 15,690 10.80
51 Hamilton County 15,684 10.50
52 Kossuth County 15,554 6.17
53 Mills County 15,070 13.31
54 Harrison County 14,939 8.28
55 Butler County 14,878 9.91
56 O’Brien County 14,409 9.71
57 Allamakee County 14,341 8.65
58 Cass County 13,967 9.56
59 Wright County 13,240 8.80
60 Appanoose County 12,895 10.04
61 Union County 12,545 11.43
62 Grundy County 12,464 9.57
63 Chickasaw County 12,450 9.52
64 Shelby County 12,178 7.95
65 Cherokee County 12,083 8.09
66 Lyon County 11,592 7.61
67 Louisa County 11,398 10.95
68 Hancock County 11,352 7.68
69 Guthrie County 10,965 7.16
70 Winnebago County 10,877 10.50
71 Mitchell County 10,787 8.88
72 Montgomery County 10,751 9.79
73 Franklin County 10,691 7.09
74 Keokuk County 10,522 7.01
75 Sac County 10,361 6.94
76 Emmet County 10,313 10.05
77 Humboldt County 9,826 8.74
78 Calhoun County 9,681 6.56
79 Howard County 9,577 7.82
80 Palo Alto County 9,432 6.46
81 Greene County 9,347 6.35
82 Clarke County 9,297 8.33
83 Monona County 9,254 5.16
84 Lucas County 8,909 7.98
85 Davis County 8,764 6.73
86 Decatur County 8,468 6.15
87 Monroe County 7,981 7.12
88 Adair County 7,693 5.22
89 Worth County 7,609 7.34
90 Van Buren County 7,581 6.04
91 Fremont County 7,452 5.63
92 Pocahontas County 7,321 4.89
93 Ida County 7,100 6.34
94 Osceola County 6,473 6.27
95 Wayne County 6,414 4.71
96 Taylor County 6,328 4.58
97 Audubon County 6,130 5.34
98 Ringgold County 5,142 3.69
99 Adams County 4,040 3.68

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