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

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

Cumberland County had the highest graduate or professional degree, population 25 and over of 16 counties in 2021, at 19.7%. Somerset County had the lowest, at 5.2%. The median was 11.2% and the figure for Maine was 12.6%. Source: the U.S. Census Bureau.

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Highest19.7Cumberland County
Lowest5.2Somerset County
Median11.216 counties
Maine12.6History

Map of counties, 2021

Androscoggin County: 7.6 %Aroostook County: 6.5 %Cumberland County: 19.7 %Franklin County: 10.3 %Hancock County: 13.5 %Kennebec County: 10.9 %Knox County: 14.1 %Lincoln County: 15.5 %Oxford County: 6.6 %Penobscot County: 11.5 %Piscataquis County: 5.6 %Sagadahoc County: 16.5 %Somerset County: 5.2 %Waldo County: 12.7 %Washington County: 8.5 %York County: 11.9 %
  • Under 6.6
  • 6.6 to 10
  • 10 to 12
  • 12 to 14
  • 14 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Cumberland County: 19.7 %Cumberland County19.7Sagadahoc County: 16.5 %Sagadahoc County16.5Lincoln County: 15.5 %Lincoln County15.5Knox County: 14.1 %Knox County14.1Hancock County: 13.5 %Hancock County13.5Waldo County: 12.7 %Waldo County12.7York County: 11.9 %York County11.9Penobscot County: 11.5 %Penobscot County11.5Kennebec County: 10.9 %Kennebec County10.9Franklin County: 10.3 %Franklin County10.3Washington County: 8.5 %Washington County8.5Androscoggin County: 7.6 %Androscoggin County7.6Oxford County: 6.6 %Oxford County6.6Aroostook County: 6.5 %Aroostook County6.5Piscataquis County: 5.6 %Piscataquis County5.6Somerset County: 5.2 %Somerset County5.2Cumberland County: 19.7 %Cumberland County19.7Sagadahoc County: 16.5 %Sagadahoc County16.5Lincoln County: 15.5 %Lincoln County15.5Knox County: 14.1 %Knox County14.1Hancock County: 13.5 %Hancock County13.5Waldo County: 12.7 %Waldo County12.7York County: 11.9 %York County11.9Penobscot County: 11.5 %Penobscot County11.5Kennebec County: 10.9 %Kennebec County10.9Franklin County: 10.3 %Franklin County10.3Washington County: 8.5 %Washington County8.5Androscoggin County: 7.6 %Androscoggin County7.6Oxford County: 6.6 %Oxford County6.6Aroostook County: 6.5 %Aroostook County6.5Piscataquis County: 5.6 %Piscataquis County5.6Somerset County: 5.2 %Somerset County5.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Cumberland County19.7
2Sagadahoc County16.5
3Lincoln County15.5
4Knox County14.1
5Hancock County13.5
6Waldo County12.7
7York County11.9
8Penobscot County11.5
9Kennebec County10.9
10Franklin County10.3
11Washington County8.5
12Androscoggin County7.6
13Oxford County6.6
14Aroostook County6.5
15Piscataquis County5.6
16Somerset County5.2

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/2021/table-based-SF/data/5YRData/acsdt5y2021-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 Maine by graduate or professional degree, population 25 and over, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-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 Maine by graduate or professional degree, population 25 and over, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/maine-counties?period=2021. 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 Maine by graduate or professional degree, population 25 and over, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/maine-counties?period=2021.

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 Maine by graduate or professional degree, population 25 and over, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat, via Invokely: https://invokely.ai/rankings/graduate-or-professional-degree/maine-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_by_2021,
  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 Maine by graduate or professional degree, population 25 and over, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/maine-counties?period=2021. 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/2021/table-based-SF/data/5YRData/acsdt5y2021-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 Maine by graduate or professional degree, population 25 and over, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat
L2  - https://invokely.ai/rankings/graduate-or-professional-degree/maine-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/graduate-or-professional-degree/maine-counties?period=2021.
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/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Maine by graduate or professional degree, population 25 and over using official data, and cite the source.
rank_places {"indicator":"graduate_degree_share","level":"province","within":"Maine","limit":10}
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Questions

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

Cumberland County, with 19.7% in 2021, according to the U.S. Census Bureau.

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

Somerset County, with 5.2% in 2021.

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 Maine: more rankings