Data / Rankings / Graduate or professional degree, population 25 and over / Counties in Iowa

Counties in Iowa by graduate or professional degree, population 25 and over

Johnson County had the highest graduate or professional degree, population 25 and over of 99 counties in 2022, at 24.7%. Fremont County had the lowest, at 3%. The median was 5.8% and the figure for Iowa was 10%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest24.7Johnson County
Lowest3Fremont County
Median5.899 counties
Iowa10History

Map of counties, 2022

Adair County: 4.7 %Adams County: 4.7 %Allamakee County: 4.9 %Appanoose County: 4.8 %Audubon County: 5.7 %Benton County: 7.2 %Black Hawk County: 10.5 %Boone County: 7.2 %Bremer County: 10.8 %Buchanan County: 6.2 %Buena Vista County: 7.2 %Butler County: 4.2 %Calhoun County: 6.2 %Carroll County: 5.7 %Cass County: 5.7 %Cedar County: 5.7 %Cerro Gordo County: 7.5 %Cherokee County: 7.4 %Chickasaw County: 4.6 %Clarke County: 5.6 %Clay County: 7.7 %Clayton County: 4.4 %Clinton County: 6.6 %Crawford County: 3.5 %Dallas County: 16.8 %Davis County: 5.2 %Decatur County: 10.5 %Delaware County: 4.9 %Des Moines County: 8 %Dickinson County: 8.1 %Dubuque County: 10.7 %Emmet County: 4.2 %Fayette County: 4.8 %Floyd County: 5.1 %Franklin County: 3.4 %Fremont County: 3 %Greene County: 5.3 %Grundy County: 6.6 %Guthrie County: 6.3 %Hamilton County: 4.9 %Hancock County: 3.8 %Hardin County: 5.9 %Harrison County: 5.6 %Henry County: 6.9 %Howard County: 3.8 %Humboldt County: 3.9 %Ida County: 4.4 %Iowa County: 6.5 %Jackson County: 5.2 %Jasper County: 5.9 %Jefferson County: 16.9 %Johnson County: 24.7 %Jones County: 7 %Keokuk County: 4.7 %Kossuth County: 5.4 %Lee County: 5.8 %Linn County: 10.9 %Louisa County: 3 %Lucas County: 4.2 %Lyon County: 4.2 %Madison County: 6.5 %Mahaska County: 5.7 %Marion County: 10.4 %Marshall County: 6.1 %Mills County: 9.5 %Mitchell County: 5.7 %Monona County: 4.5 %Monroe County: 4.2 %Montgomery County: 5.1 %Muscatine County: 6.9 %O'Brien County: 4.5 %Osceola County: 4.3 %Page County: 5.5 %Palo Alto County: 5.6 %Plymouth County: 6.2 %Pocahontas County: 4 %Polk County: 12.4 %Pottawattamie County: 7.3 %Poweshiek County: 12.6 %Ringgold County: 6.8 %Sac County: 5.6 %Scott County: 12.7 %Shelby County: 6.5 %Sioux County: 8.9 %Story County: 22.4 %Tama County: 5.5 %Taylor County: 3.7 %Union County: 6.8 %Van Buren County: 5.9 %Wapello County: 6.9 %Warren County: 9.8 %Washington County: 8.2 %Wayne County: 3.8 %Webster County: 5.3 %Winnebago County: 6.3 %Winneshiek County: 11 %Woodbury County: 8.1 %Worth County: 5.8 %Wright County: 4.3 %
  • Under 4.3
  • 4.3 to 5.2
  • 5.2 to 5.8
  • 5.8 to 6.8
  • 6.8 to 8.7
  • 8.7 and over
%, 2022. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2022

Johnson County: 24.7 %Johnson County24.7Story County: 22.4 %Story County22.4Jefferson County: 16.9 %Jefferson County16.9Dallas County: 16.8 %Dallas County16.8Scott County: 12.7 %Scott County12.7Poweshiek County: 12.6 %Poweshiek County12.6Polk County: 12.4 %Polk County12.4Winneshiek County: 11 %Winneshiek County11Linn County: 10.9 %Linn County10.9Bremer County: 10.8 %Bremer County10.8Dubuque County: 10.7 %Dubuque County10.7Black Hawk County: 10.5 %Black Hawk County10.5Decatur County: 10.5 %Decatur County10.5Marion County: 10.4 %Marion County10.4Warren County: 9.8 %Warren County9.8Mills County: 9.5 %Mills County9.5Sioux County: 8.9 %Sioux County8.9Washington County: 8.2 %Washington County8.2Woodbury County: 8.1 %Woodbury County8.1Dickinson County: 8.1 %Dickinson County8.1Des Moines County: 8 %Des Moines County8Clay County: 7.7 %Clay County7.7Cerro Gordo County: 7.5 %Cerro Gordo County7.5Cherokee County: 7.4 %Cherokee County7.4Pottawattamie County: 7.3 %Pottawattamie County7.3Benton County: 7.2 %Benton County7.2Boone County: 7.2 %Boone County7.2Buena Vista County: 7.2 %Buena Vista County7.2Jones County: 7 %Jones County7Henry County: 6.9 %Henry County6.9Muscatine County: 6.9 %Muscatine County6.9Wapello County: 6.9 %Wapello County6.9Union County: 6.8 %Union County6.8Ringgold County: 6.8 %Ringgold County6.8Grundy County: 6.6 %Grundy County6.6Clinton County: 6.6 %Clinton County6.6Iowa County: 6.5 %Iowa County6.5Madison County: 6.5 %Madison County6.5Shelby County: 6.5 %Shelby County6.5Guthrie County: 6.3 %Guthrie County6.3Johnson County: 24.7 %Johnson County24.7Story County: 22.4 %Story County22.4Jefferson County: 16.9 %Jefferson County16.9Dallas County: 16.8 %Dallas County16.8Scott County: 12.7 %Scott County12.7Poweshiek County: 12.6 %Poweshiek County12.6Polk County: 12.4 %Polk County12.4Winneshiek County: 11 %Winneshiek County11Linn County: 10.9 %Linn County10.9Bremer County: 10.8 %Bremer County10.8Dubuque County: 10.7 %Dubuque County10.7Black Hawk County: 10.5 %Black Hawk County10.5Decatur County: 10.5 %Decatur County10.5Marion County: 10.4 %Marion County10.4Warren County: 9.8 %Warren County9.8Mills County: 9.5 %Mills County9.5Sioux County: 8.9 %Sioux County8.9Washington County: 8.2 %Washington County8.2Woodbury County: 8.1 %Woodbury County8.1Dickinson County: 8.1 %Dickinson County8.1Des Moines County: 8 %Des Moines County8Clay County: 7.7 %Clay County7.7Cerro Gordo County: 7.5 %Cerro Gordo County7.5Cherokee County: 7.4 %Cherokee County7.4Pottawattamie County: 7.3 %Pottawattamie County7.3Benton County: 7.2 %Benton County7.2Boone County: 7.2 %Boone County7.2Buena Vista County: 7.2 %Buena Vista County7.2Jones County: 7 %Jones County7Henry County: 6.9 %Henry County6.9Muscatine County: 6.9 %Muscatine County6.9Wapello County: 6.9 %Wapello County6.9Union County: 6.8 %Union County6.8Ringgold County: 6.8 %Ringgold County6.8Grundy County: 6.6 %Grundy County6.6Clinton County: 6.6 %Clinton County6.6Iowa County: 6.5 %Iowa County6.5Madison County: 6.5 %Madison County6.5Shelby County: 6.5 %Shelby County6.5Guthrie County: 6.3 %Guthrie County6.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1Johnson County24.7+0.3 pts
2Story County22.4+1.3 pts
3Jefferson County16.9+0.5 pts
4Dallas County16.8+0.6 pts
5Scott County12.7+0.3 pts
6Poweshiek County12.6-0.2 pts
7Polk County12.4+0.5 pts
8Winneshiek County11-1.1 pts
9Linn County10.9+0.1 pts
10Bremer County10.8-0.7 pts
11Dubuque County10.7-0.4 pts
12Black Hawk County10.5+0.3 pts
13Decatur County10.5-1.5 pts
14Marion County10.4+0.7 pts
15Warren County9.8+0.2 pts
16Mills County9.5+0.5 pts
17Sioux County8.9+0.2 pts
18Washington County8.2+0.9 pts
19Woodbury County8.1+0.7 pts
20Dickinson County8.1+0.8 pts
21Des Moines County8+0.7 pts
22Clay County7.7+1 pts
23Cerro Gordo County7.5-0.1 pts
24Cherokee County7.4+0.3 pts
25Pottawattamie County7.30 pts
26Benton County7.2+0.2 pts
27Boone County7.2+0.5 pts
28Buena Vista County7.2+0.4 pts
29Jones County7+0.6 pts
30Henry County6.9-0 pts
31Muscatine County6.9-0.2 pts
32Wapello County6.9-0.1 pts
33Union County6.8+0.1 pts
34Ringgold County6.80 pts
35Grundy County6.6+0.2 pts
36Clinton County6.6+0.7 pts
37Iowa County6.5+0.1 pts
38Madison County6.5-1 pts
39Shelby County6.5+1 pts
40Guthrie County6.3+0.3 pts
41Winnebago County6.3+0.1 pts
42Calhoun County6.2-0.2 pts
43Buchanan County6.20 pts
44Plymouth County6.2-0.4 pts
45Marshall County6.1-0.3 pts
46Jasper County5.90 pts
46Van Buren County5.9-0.3 pts
48Hardin County5.9+0.7 pts
49Worth County5.8-0.2 pts
50Lee County5.8+0.3 pts
51Carroll County5.7+0.5 pts
52Audubon County5.7+0.2 pts
53Mitchell County5.7+0.1 pts
54Cedar County5.7-0.3 pts
55Cass County5.7-0.2 pts
55Mahaska County5.7-0.2 pts
57Palo Alto County5.6-1.2 pts
58Sac County5.6+1.5 pts
59Clarke County5.6+1.4 pts
59Harrison County5.6+0.2 pts
61Page County5.5+0.5 pts
62Tama County5.5+0.5 pts
63Kossuth County5.4+0.5 pts
64Greene County5.3+0.4 pts
65Webster County5.3-0.4 pts
66Davis County5.2+0.1 pts
67Jackson County5.2-0.9 pts
68Floyd County5.1-0.4 pts
69Montgomery County5.1+0.7 pts
70Delaware County4.9-0.2 pts
71Allamakee County4.9-0.5 pts
72Hamilton County4.9-1.2 pts
73Fayette County4.80 pts
74Appanoose County4.8-0.3 pts
75Adair County4.7-0.6 pts
75Adams County4.7+0.5 pts
77Keokuk County4.7-0.4 pts
78Chickasaw County4.6-0.7 pts
79O'Brien County4.5-0.3 pts
80Monona County4.5+0.5 pts
81Clayton County4.4+0.1 pts
81Ida County4.4+0.2 pts
83Wright County4.3+0.1 pts
84Osceola County4.3-0.6 pts
85Lyon County4.20 pts
86Emmet County4.2-0.2 pts
87Butler County4.20 pts
88Monroe County4.2-0.2 pts
89Lucas County4.2+0.6 pts
90Pocahontas County4+0.1 pts
91Humboldt County3.9+0.5 pts
92Wayne County3.8-0.8 pts
93Howard County3.8-0.9 pts
94Hancock County3.8+0.3 pts
95Taylor County3.7-0.6 pts
96Crawford County3.5-0.6 pts
97Franklin County3.4+0.2 pts
98Louisa County3-1.3 pts
99Fremont County3-0.2 pts

Other periods

About this ranking

People aged 25 and over whose highest degree is a 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.

A subset of bachelors_degree_share, which also counts people whose highest degree is a bachelor's.

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 master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs (Counties in Iowa by graduate or professional degree, population 25 and over, 2022) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat

MLA 9

American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Iowa by graduate or professional degree, population 25 and over, 2022. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat. Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties?period=2022. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. Counties in Iowa by graduate or professional degree, population 25 and over, 2022. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties?period=2022.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Iowa by graduate or professional degree, population 25 and over, 2022 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat, via Invokely: https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_iowa_by_2022,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Iowa by graduate or professional degree, population 25 and over, 2022}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties?period=2022. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Iowa by graduate or professional degree, population 25 and over, 2022
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat
L2  - https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties?period=2022.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b15003.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Iowa by graduate or professional degree, population 25 and over using official data, and cite the source.
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Questions

Which county has the highest graduate or professional degree, population 25 and over?

Johnson County, with 24.7% in 2022, according to the U.S. Census Bureau.

Which county has the lowest graduate or professional degree, population 25 and over?

Fremont County, with 3% in 2022.

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 master's, professional school or doctorate degree as a percentage of the population 25 years and over, calculated with stored inputs. Retrieved 2026-10-12.

Graduate or professional degree, population 25 and over: other rankings

Counties in Iowa: more rankings