Ranking of Iowa Counties By Percentage of Population Aged 25 years and above with an Educational attainment of Less than High School Diploma in 2021 (ACS-5Yrs)
Updated on September 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the percentage of the population of Iowa (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 7.19%. Among all Iowa counties, Buena Vista County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (20.63%), followed by Davis County (20.51%), and Crawford County (18.70%).
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.
You can also see similar information for other states and for the United States.
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Related Topics: Iowa ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Iowa Counties By Percentage of Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Buena Vista County | 20.63 |
| 2 | Davis County | 20.51 |
| 3 | Crawford County | 18.70 |
| 4 | Clarke County | 15.49 |
| 5 | Louisa County | 15.46 |
| 6 | Marshall County | 14.73 |
| 7 | Woodbury County | 12.26 |
| 8 | Van Buren County | 12.19 |
| 9 | Wapello County | 12.01 |
| 10 | Osceola County | 11.43 |
| 11 | Cass County | 10.67 |
| 12 | Wayne County | 10.52 |
| 13 | Pocahontas County | 10.48 |
| 14 | Muscatine County | 10.39 |
| 15 | Emmet County | 10.25 |
| 16 | Decatur County | 10.10 |
| 17 | Pottawattamie County | 10.04 |
| 18 | Allamakee County | 9.65 |
| 19 | Tama County | 9.30 |
| 20 | Franklin County | 9.19 |
| 20 | Taylor County | 9.19 |
| 21 | Appanoose County | 9.13 |
| 22 | Clayton County | 9.07 |
| 23 | Union County | 8.93 |
| 24 | Webster County | 8.50 |
| 25 | Howard County | 8.42 |
| 26 | O'Brien County | 8.41 |
| 27 | Hancock County | 8.24 |
| 28 | Audubon County | 8.22 |
| 29 | Henry County | 8.09 |
| 30 | Washington County | 8.08 |
| 31 | Mahaska County | 8.04 |
| 32 | Clinton County | 8.02 |
| 33 | Sioux County | 7.98 |
| 34 | Page County | 7.92 |
| 35 | Black Hawk County | 7.89 |
| 36 | Delaware County | 7.81 |
| 36 | Harrison County | 7.81 |
| 36 | Montgomery County | 7.81 |
| 37 | Hardin County | 7.63 |
| 38 | Polk County | 7.51 |
| 39 | Fayette County | 7.43 |
| 40 | Ida County | 7.39 |
| 41 | Wright County | 7.32 |
| 42 | Mitchell County | 7.24 |
| 43 | Jefferson County | 7.23 |
| 44 | Floyd County | 7.20 |
| 45 | Monona County | 7.19 |
| 46 | Lucas County | 7.17 |
| 47 | Des Moines County | 7.07 |
| 48 | Keokuk County | 7.03 |
| 49 | Humboldt County | 6.89 |
| 50 | Worth County | 6.88 |
| 51 | Greene County | 6.81 |
| 52 | Ringgold County | 6.73 |
| 53 | Lee County | 6.70 |
| 54 | Chickasaw County | 6.67 |
| 55 | Palo Alto County | 6.54 |
| 56 | Shelby County | 6.52 |
| 57 | Hamilton County | 6.50 |
| 57 | Monroe County | 6.50 |
| 58 | Cerro Gordo County | 6.49 |
| 59 | Cherokee County | 6.48 |
| 59 | Jackson County | 6.48 |
| 60 | Kossuth County | 6.42 |
| 61 | Sac County | 6.40 |
| 62 | Lyon County | 6.27 |
| 63 | Dubuque County | 6.25 |
| 64 | Buchanan County | 6.24 |
| 65 | Scott County | 6.06 |
| 66 | Calhoun County | 6.00 |
| 67 | Marion County | 5.98 |
| 68 | Butler County | 5.86 |
| 68 | Jasper County | 5.86 |
| 69 | Boone County | 5.85 |
| 70 | Poweshiek County | 5.83 |
| 71 | Carroll County | 5.78 |
| 72 | Benton County | 5.77 |
| 73 | Winnebago County | 5.69 |
| 74 | Guthrie County | 5.63 |
| 74 | Plymouth County | 5.63 |
| 75 | Adams County | 5.47 |
| 76 | Iowa County | 5.46 |
| 77 | Jones County | 5.33 |
| 78 | Adair County | 5.30 |
| 79 | Fremont County | 5.27 |
| 80 | Linn County | 5.10 |
| 81 | Mills County | 4.78 |
| 82 | Grundy County | 4.59 |
| 83 | Clay County | 4.55 |
| 84 | Cedar County | 4.45 |
| 84 | Dickinson County | 4.45 |
| 85 | Warren County | 4.23 |
| 86 | Winneshiek County | 4.12 |
| 87 | Dallas County | 4.11 |
| 88 | Johnson County | 3.76 |
| 89 | Madison County | 3.53 |
| 90 | Bremer County | 3.51 |
| 91 | Story County | 3.15 |