Ranking of Iowa Counties By Black or African American Alone Population Aged 25 years and above with an Educational attainment of Less than High School Diploma in 2021 (ACS-5Yrs)

Updated on September 5, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the Iowa Black or African American Alone population (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 9,785. Among all Iowa counties, Polk County had the highest Black or African American Alone population (aged 25 years and above) with an educational attainment of Less than High School Diploma (2,836), followed by Linn County (1,097), and Black Hawk County (1,069).

The chart below shows the top 10 Iowa counties, and the table below shows the ranking of all Iowa counties.

You can see similar information for other educational attainments, and for other races and ethnicities.

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

Ranking of Iowa Counties By Black or African American Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
Polk County
Linn County
Black Hawk County
Scott County
Johnson County
Woodbury County
Clinton County
Des Moines County
Cerro Gordo County
Story County
Ranking of Iowa Counties By Black or African American Alone Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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Rank County Number of People
1 Polk County 2836
2 Linn County 1097
3 Black Hawk County 1069
4 Scott County 879
5 Johnson County 500
5 Woodbury County 500
6 Clinton County 317
7 Des Moines County 227
8 Cerro Gordo County 194
9 Story County 159
10 Crawford County 155
11 Wapello County 141
12 Lee County 131
13 Dallas County 128
14 Mahaska County 110
15 Buena Vista County 105
16 Cherokee County 100
17 Henry County 94
18 Jasper County 92
19 Warren County 91
20 Webster County 89
21 Dubuque County 81
22 Jones County 77
23 Marshall County 71
24 Plymouth County 66
25 Pottawattamie County 49
26 Page County 40
27 Adair County 33
27 Hardin County 33
28 Iowa County 29
29 Muscatine County 26
30 Washington County 25
31 Bremer County 19
32 Calhoun County 18
32 Tama County 18
33 Ida County 15
34 Allamakee County 14
34 Benton County 14
34 Pocahontas County 14
35 Palo Alto County 13
36 Hamilton County 12
37 Cass County 11
38 Mitchell County 10
39 Boone County 9
40 Cedar County 7
40 Sioux County 7
40 Wayne County 7
41 Fremont County 6
41 Greene County 6
42 Buchanan County 4
43 Clay County 3
43 Emmet County 3
43 Howard County 3
43 Madison County 3
44 Clayton County 2
44 Delaware County 2
44 Harrison County 2
44 Jackson County 2
44 Lucas County 2
44 Osceola County 2
44 Van Buren County 2
45 Butler County 1
45 Decatur County 1
45 Fayette County 1
45 Guthrie County 1
45 Humboldt County 1
45 Jefferson County 1
45 Kossuth County 1
45 Mills County 1
45 Poweshiek County 1
45 Sac County 1
45 Wright County 1
46 Adams County 0
46 Appanoose County 0
46 Audubon County 0
46 Carroll County 0
46 Chickasaw County 0
46 Clarke County 0
46 Dickinson County 0
46 Floyd County 0
46 Franklin County 0
46 Grundy County 0
46 Hancock County 0
46 Keokuk County 0
46 Louisa County 0
46 Lyon County 0
46 Marion County 0
46 Monona County 0
46 Monroe County 0
46 Montgomery County 0
46 O'Brien County 0
46 Shelby County 0
46 Union County 0
46 Winnebago County 0
46 Winneshiek County 0
46 Worth County 0