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, 2024

Johnson County had the highest graduate or professional degree, population 25 and over of 99 counties in 2024, at 24.1%. Louisa County had the lowest, at 2.9%. The median was 6.3% and the figure for Iowa was 10.5%. Source: the U.S. Census Bureau.

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Highest24.1Johnson County
Lowest2.9Louisa County
Median6.399 counties
Iowa10.5History

Map of counties, 2024

Adair County: 5.2 %Adams County: 5.8 %Allamakee County: 6.7 %Appanoose County: 4.1 %Audubon County: 3.6 %Benton County: 8.2 %Black Hawk County: 11 %Boone County: 9.5 %Bremer County: 12.1 %Buchanan County: 5.8 %Buena Vista County: 7.5 %Butler County: 5.1 %Calhoun County: 6.4 %Carroll County: 6.1 %Cass County: 5.1 %Cedar County: 5.8 %Cerro Gordo County: 7.9 %Cherokee County: 8.3 %Chickasaw County: 5.5 %Clarke County: 5.8 %Clay County: 7 %Clayton County: 3.9 %Clinton County: 7 %Crawford County: 4.2 %Dallas County: 17.7 %Davis County: 5.1 %Decatur County: 11.2 %Delaware County: 6.5 %Des Moines County: 7.5 %Dickinson County: 8.6 %Dubuque County: 11.6 %Emmet County: 4.4 %Fayette County: 6 %Floyd County: 4.8 %Franklin County: 5 %Fremont County: 3.4 %Greene County: 5.4 %Grundy County: 7.4 %Guthrie County: 8 %Hamilton County: 6.7 %Hancock County: 5.4 %Hardin County: 5.9 %Harrison County: 5.8 %Henry County: 7.2 %Howard County: 3.9 %Humboldt County: 4.6 %Ida County: 5.1 %Iowa County: 7 %Jackson County: 5 %Jasper County: 6.5 %Jefferson County: 18.8 %Johnson County: 24.1 %Jones County: 6.5 %Keokuk County: 4.7 %Kossuth County: 5.8 %Lee County: 6.6 %Linn County: 11.4 %Louisa County: 2.9 %Lucas County: 5.3 %Lyon County: 4.1 %Madison County: 6.5 %Mahaska County: 6 %Marion County: 9.7 %Marshall County: 7.4 %Mills County: 9.6 %Mitchell County: 7.6 %Monona County: 6.1 %Monroe County: 7.4 %Montgomery County: 5.3 %Muscatine County: 7.2 %O'Brien County: 4.9 %Osceola County: 4.1 %Page County: 5.8 %Palo Alto County: 4.5 %Plymouth County: 5 %Pocahontas County: 4.2 %Polk County: 13.1 %Pottawattamie County: 7.9 %Poweshiek County: 11.3 %Ringgold County: 5.7 %Sac County: 5.1 %Scott County: 14 %Shelby County: 8.3 %Sioux County: 8.3 %Story County: 23.5 %Tama County: 6 %Taylor County: 4.6 %Union County: 6.3 %Van Buren County: 5.8 %Wapello County: 7.6 %Warren County: 9.7 %Washington County: 9 %Wayne County: 5 %Webster County: 5.8 %Winnebago County: 7.1 %Winneshiek County: 10.3 %Woodbury County: 8.4 %Worth County: 4.7 %Wright County: 6.5 %
  • Under 4.8
  • 4.8 to 5.6
  • 5.6 to 6.3
  • 6.3 to 7.4
  • 7.4 to 9.3
  • 9.3 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

Johnson County: 24.1 %Johnson County24.1Story County: 23.5 %Story County23.5Jefferson County: 18.8 %Jefferson County18.8Dallas County: 17.7 %Dallas County17.7Scott County: 14 %Scott County14Polk County: 13.1 %Polk County13.1Bremer County: 12.1 %Bremer County12.1Dubuque County: 11.6 %Dubuque County11.6Linn County: 11.4 %Linn County11.4Poweshiek County: 11.3 %Poweshiek County11.3Decatur County: 11.2 %Decatur County11.2Black Hawk County: 11 %Black Hawk County11Winneshiek County: 10.3 %Winneshiek County10.3Warren County: 9.7 %Warren County9.7Marion County: 9.7 %Marion County9.7Mills County: 9.6 %Mills County9.6Boone County: 9.5 %Boone County9.5Washington County: 9 %Washington County9Dickinson County: 8.6 %Dickinson County8.6Woodbury County: 8.4 %Woodbury County8.4Cherokee County: 8.3 %Cherokee County8.3Shelby County: 8.3 %Shelby County8.3Sioux County: 8.3 %Sioux County8.3Benton County: 8.2 %Benton County8.2Guthrie County: 8 %Guthrie County8Cerro Gordo County: 7.9 %Cerro Gordo County7.9Pottawattamie County: 7.9 %Pottawattamie County7.9Wapello County: 7.6 %Wapello County7.6Mitchell County: 7.6 %Mitchell County7.6Buena Vista County: 7.5 %Buena Vista County7.5Des Moines County: 7.5 %Des Moines County7.5Grundy County: 7.4 %Grundy County7.4Monroe County: 7.4 %Monroe County7.4Marshall County: 7.4 %Marshall County7.4Henry County: 7.2 %Henry County7.2Muscatine County: 7.2 %Muscatine County7.2Winnebago County: 7.1 %Winnebago County7.1Clinton County: 7 %Clinton County7Clay County: 7 %Clay County7Iowa County: 7 %Iowa County7Johnson County: 24.1 %Johnson County24.1Story County: 23.5 %Story County23.5Jefferson County: 18.8 %Jefferson County18.8Dallas County: 17.7 %Dallas County17.7Scott County: 14 %Scott County14Polk County: 13.1 %Polk County13.1Bremer County: 12.1 %Bremer County12.1Dubuque County: 11.6 %Dubuque County11.6Linn County: 11.4 %Linn County11.4Poweshiek County: 11.3 %Poweshiek County11.3Decatur County: 11.2 %Decatur County11.2Black Hawk County: 11 %Black Hawk County11Winneshiek County: 10.3 %Winneshiek County10.3Warren County: 9.7 %Warren County9.7Marion County: 9.7 %Marion County9.7Mills County: 9.6 %Mills County9.6Boone County: 9.5 %Boone County9.5Washington County: 9 %Washington County9Dickinson County: 8.6 %Dickinson County8.6Woodbury County: 8.4 %Woodbury County8.4Cherokee County: 8.3 %Cherokee County8.3Shelby County: 8.3 %Shelby County8.3Sioux County: 8.3 %Sioux County8.3Benton County: 8.2 %Benton County8.2Guthrie County: 8 %Guthrie County8Cerro Gordo County: 7.9 %Cerro Gordo County7.9Pottawattamie County: 7.9 %Pottawattamie County7.9Wapello County: 7.6 %Wapello County7.6Mitchell County: 7.6 %Mitchell County7.6Buena Vista County: 7.5 %Buena Vista County7.5Des Moines County: 7.5 %Des Moines County7.5Grundy County: 7.4 %Grundy County7.4Monroe County: 7.4 %Monroe County7.4Marshall County: 7.4 %Marshall County7.4Henry County: 7.2 %Henry County7.2Muscatine County: 7.2 %Muscatine County7.2Winnebago County: 7.1 %Winnebago County7.1Clinton County: 7 %Clinton County7Clay County: 7 %Clay County7Iowa County: 7 %Iowa County7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Johnson County24.1+0.1 pts
2Story County23.5+0.6 pts
3Jefferson County18.8+0.5 pts
4Dallas County17.7+0.2 pts
5Scott County14+0.3 pts
6Polk County13.1+0.3 pts
7Bremer County12.1+1 pts
8Dubuque County11.6+0.4 pts
9Linn County11.4+0.1 pts
10Poweshiek County11.3-0.4 pts
11Decatur County11.2+1.1 pts
12Black Hawk County11+0.2 pts
13Winneshiek County10.30 pts
14Warren County9.7-0.3 pts
15Marion County9.7-0.4 pts
16Mills County9.6-0.2 pts
17Boone County9.5+0.4 pts
18Washington County9+0.5 pts
19Dickinson County8.6+0.3 pts
20Woodbury County8.4+0.6 pts
21Cherokee County8.3+1 pts
21Shelby County8.3+0.9 pts
23Sioux County8.3-0.7 pts
24Benton County8.2+0.2 pts
25Guthrie County8+0.2 pts
26Cerro Gordo County7.90 pts
27Pottawattamie County7.9+0.4 pts
28Wapello County7.6-0 pts
29Mitchell County7.6+1.4 pts
30Buena Vista County7.5+0.6 pts
31Des Moines County7.5-0.5 pts
32Grundy County7.4+1.2 pts
32Monroe County7.4+2.4 pts
34Marshall County7.4+0.6 pts
35Henry County7.20 pts
36Muscatine County7.2+0.5 pts
37Winnebago County7.1+0.8 pts
38Clinton County7+0.5 pts
39Clay County7-0.5 pts
40Iowa County7+0.2 pts
41Allamakee County6.7+0.8 pts
42Hamilton County6.7+0.8 pts
43Lee County6.6+1.1 pts
44Jasper County6.5-0.1 pts
45Wright County6.5+1.2 pts
46Delaware County6.5+0.5 pts
46Madison County6.5+0.3 pts
48Jones County6.5+0.1 pts
49Calhoun County6.4-0.1 pts
50Union County6.3-0.5 pts
51Monona County6.1+0.1 pts
52Carroll County6.1+0.5 pts
53Mahaska County6+0.1 pts
54Fayette County6+0.5 pts
55Tama County6+0.2 pts
56Hardin County5.9+0.1 pts
57Adams County5.8+1.1 pts
57Harrison County5.8+0.2 pts
57Webster County5.8+0.7 pts
60Van Buren County5.8-0 pts
61Buchanan County5.8-0.6 pts
61Clarke County5.8+0.5 pts
63Page County5.80 pts
64Cedar County5.8+0.1 pts
64Kossuth County5.8-0.1 pts
66Ringgold County5.7-0.6 pts
67Chickasaw County5.5+0.5 pts
68Greene County5.4+0.3 pts
69Hancock County5.4+1 pts
70Lucas County5.3+0.7 pts
71Montgomery County5.3+0.3 pts
72Adair County5.2+0.1 pts
73Butler County5.1+0.3 pts
74Sac County5.1-0.1 pts
75Davis County5.1-0 pts
76Cass County5.1-0.5 pts
77Ida County5.1+0.6 pts
78Jackson County5+0.5 pts
78Wayne County5+0.4 pts
80Franklin County5+0.3 pts
80Plymouth County5-0.5 pts
82O'Brien County4.9-0.1 pts
83Floyd County4.8-0.5 pts
84Keokuk County4.7+0.3 pts
85Worth County4.7-0.7 pts
86Humboldt County4.6+0.1 pts
87Taylor County4.6+0.9 pts
88Palo Alto County4.5-0.5 pts
89Emmet County4.4+0.1 pts
90Pocahontas County4.2+0.6 pts
91Crawford County4.2+0.3 pts
92Osceola County4.1-0.3 pts
93Lyon County4.1+0.2 pts
94Appanoose County4.1-0.1 pts
95Clayton County3.9-0.3 pts
96Howard County3.9+0.1 pts
97Audubon County3.6-0.8 pts
98Fremont County3.4-0.5 pts
99Louisa County2.9+0.3 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/2024/table-based-SF/data/5YRData/acsdt5y2024-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, 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-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, 2024. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties. 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, 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties.

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, 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat, via Invokely: https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_iowa_by_2024,
  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, 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties. 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/2024/table-based-SF/data/5YRData/acsdt5y2024-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, 2024
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat
L2  - https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/iowa-counties.
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/2024/table-based-SF/data/5YRData/acsdt5y2024-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 24.1% in 2024, according to the U.S. Census Bureau.

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

Louisa County, with 2.9% 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 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