Data / Rankings / Bachelor's degree or higher, population 25 and over / Counties in Iowa

Counties in Iowa by share of adults with a bachelor's degree, 2024

Johnson County had the highest share of adults with a bachelor's degree of 99 counties in 2024, at 55.2%. Clayton County had the lowest, at 14.5%. The median was 22.3% and the figure for Iowa was 31.4%. Source: the U.S. Census Bureau.

Highest55.2Johnson County
Lowest14.5Clayton County
Median22.399 counties
Iowa31.4History

Top 40 counties, 2024

CSVChart (SVG)

Johnson CountyJohnson County: 55.2 %55.2Story CountyStory County: 54.9 %54.9Dallas CountyDallas County: 51.5 %51.5Jefferson CountyJefferson County: 43.2 %43.2Polk CountyPolk County: 40.3 %40.3Scott CountyScott County: 36.6 %36.6Bremer CountyBremer County: 36.3 %36.3Linn CountyLinn County: 34.7 %34.7Dubuque CountyDubuque County: 33.4 %33.4Warren CountyWarren County: 33.3 %33.3Marion CountyMarion County: 32.1 %32.1Winneshiek CountyWinneshiek County: 31.2 %31.2Dickinson CountyDickinson County: 31.2 %31.2Mills CountyMills County: 31 %31Sioux CountySioux County: 30.6 %30.6Black Hawk CountyBlack Hawk County: 30.3 %30.3Boone CountyBoone County: 28.5 %28.5Grundy CountyGrundy County: 27.8 %27.8Clay CountyClay County: 27.6 %27.6Poweshiek CountyPoweshiek County: 27.3 %27.3Madison CountyMadison County: 27.2 %27.2Adams CountyAdams County: 27 %27Washington CountyWashington County: 26.2 %26.2Winnebago CountyWinnebago County: 26.1 %26.1Benton CountyBenton County: 25.6 %25.6Guthrie CountyGuthrie County: 25 %25Mitchell CountyMitchell County: 24.9 %24.9Wright CountyWright County: 24.9 %24.9Iowa CountyIowa County: 24.8 %24.8Ringgold CountyRinggold County: 24.6 %24.6Woodbury CountyWoodbury County: 24.3 %24.3Mahaska CountyMahaska County: 24.1 %24.1Shelby CountyShelby County: 24.1 %24.1Carroll CountyCarroll County: 24 %24Cerro Gordo CountyCerro Gordo County: 24 %24Des Moines CountyDes Moines County: 23.8 %23.8Cedar CountyCedar County: 23.7 %23.7Pottawattamie CountyPottawattamie County: 23.6 %23.6Decatur CountyDecatur County: 23.5 %23.5Cherokee CountyCherokee County: 23.4 %23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2024 (%)Change on 2023
1Johnson County55.2+0.6 pts
2Story County54.9+1.5 pts
3Dallas County51.5-0.1 pts
4Jefferson County43.2+1.6 pts
5Polk County40.3+0.7 pts
6Scott County36.6+0.4 pts
7Bremer County36.3+1 pts
8Linn County34.7-0.1 pts
9Dubuque County33.4+0.5 pts
10Warren County33.3+0.6 pts
11Marion County32.1-1 pts
12Winneshiek County31.2-0.3 pts
13Dickinson County31.2-1.1 pts
14Mills County31-1.1 pts
15Sioux County30.6+0.2 pts
16Black Hawk County30.3+0.1 pts
17Boone County28.5-0.2 pts
18Grundy County27.8+3.1 pts
19Clay County27.6+1.5 pts
20Poweshiek County27.3-0.8 pts
21Madison County27.2+1.6 pts
22Adams County27+2.5 pts
23Washington County26.2+1.3 pts
24Winnebago County26.1+1 pts
25Benton County25.6+0.6 pts
26Guthrie County25+0.8 pts
27Mitchell County24.9+2.2 pts
28Wright County24.9+1.4 pts
29Iowa County24.8+0.6 pts
30Ringgold County24.6-0.6 pts
31Woodbury County24.3+0.9 pts
32Mahaska County24.1+1.1 pts
33Shelby County24.1+0.8 pts
34Carroll County24+0.6 pts
35Cerro Gordo County24-0.3 pts
36Des Moines County23.8-0 pts
37Cedar County23.7+2.3 pts
38Pottawattamie County23.6+0.1 pts
39Decatur County23.5-0.7 pts
40Cherokee County23.4+1.8 pts
41Union County23.4-0.8 pts
42Muscatine County23.1+0.4 pts
43Henry County23+0.4 pts
44Kossuth County22.8+0.7 pts
45Hamilton County22.8+0.8 pts
46Delaware County22.6+2.8 pts
46Marshall County22.6+1.1 pts
48Clinton County22.4+0.3 pts
49Buchanan County22.40 pts
50Sac County22.3+1.1 pts
51Buena Vista County22.2+0.2 pts
52Allamakee County22.2+2.3 pts
53Cass County22.1+0.6 pts
54O'Brien County22.1-0.4 pts
55Jones County22+1.3 pts
56Webster County22+1.5 pts
57Harrison County22+0.8 pts
58Hardin County21.9+0.8 pts
59Calhoun County21.8+0.3 pts
60Lee County21.7+0.7 pts
61Plymouth County21.7-2.2 pts
62Ida County21.6+0.9 pts
63Butler County21.4+1 pts
64Monroe County21.4+1.4 pts
65Greene County21.2+1.4 pts
66Chickasaw County21.2+2.1 pts
67Audubon County20.8+0.2 pts
68Fremont County20.8-0.4 pts
69Fayette County20.7+2.5 pts
70Tama County20.5+1.1 pts
71Appanoose County20.5+1.2 pts
72Hancock County20.5-0.9 pts
73Lyon County20.4-0.3 pts
74Montgomery County20.4+1.7 pts
75Jasper County20+0.1 pts
76Adair County19.9-0.1 pts
77Monona County19.6+0.9 pts
78Wapello County19.6+0.2 pts
79Howard County19.5+0.8 pts
79Jackson County19.5+1.2 pts
81Franklin County19.4+1.2 pts
82Humboldt County19.4+0.1 pts
83Page County19.2+0.4 pts
84Worth County19.1-0.9 pts
85Palo Alto County19-1.5 pts
86Van Buren County18.8-0.6 pts
87Pocahontas County18.70 pts
88Floyd County18.3-0.2 pts
89Crawford County17.7-0.5 pts
90Wayne County17.2+1.2 pts
91Emmet County17.1+1.4 pts
92Davis County17.1-0.6 pts
93Keokuk County17+1.1 pts
94Louisa County16.8+0.3 pts
95Osceola County16.7+1.4 pts
96Taylor County16+0.5 pts
97Clarke County16-0 pts
98Lucas County15.8+1.3 pts
99Clayton County14.5-1.3 pts

Other periods

About this ranking

People aged 25 and over whose highest degree is a bachelor's, master's, professional school or doctorate degree, as a percentage of all people aged 25 and over. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Excludes associate degrees and college without a degree. Not comparable with EU tertiary attainment, which includes short-cycle tertiary education and usually covers ages 25 to 64. Calculated from counts in ACS table B15003, which are stored as inputs.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a bachelor's degree or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Retrieved 2026-10-09.

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Rank Counties in Iowa by share of adults with a bachelor's degree using official data, and cite the source.
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Questions

Which county has the highest share of adults with a bachelor's degree?

Johnson County, with 55.2% in 2024, according to the U.S. Census Bureau.

Which county has the lowest share of adults with a bachelor's degree?

Clayton County, with 14.5% in 2024.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B15003: population 25 years and over with a bachelor's degree or higher as a percentage of the population 25 years and over, calculated with stored inputs. Retrieved 2026-10-09.

Bachelor's degree or higher, population 25 and over: other rankings

Counties in Iowa: more rankings