Data / Rankings / High school graduate or higher, population 25 and over / Counties in Maine

Counties in Maine by high school graduate or higher, population 25 and over

Cumberland County had the highest high school graduate or higher, population 25 and over of 16 counties in 2023, at 96.5%. Washington County had the lowest, at 91.2%. The median was 94.1% and the figure for Maine was 94.5%. Source: the U.S. Census Bureau.

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Highest96.5Cumberland County
Lowest91.2Washington County
Median94.116 counties
Maine94.5History

Map of counties, 2023

Androscoggin County: 92.5 %Aroostook County: 91.2 %Cumberland County: 96.5 %Franklin County: 93.8 %Hancock County: 95 %Kennebec County: 94.8 %Knox County: 94.3 %Lincoln County: 94.9 %Oxford County: 92.6 %Penobscot County: 94.5 %Piscataquis County: 92 %Sagadahoc County: 94.8 %Somerset County: 92.9 %Waldo County: 93.7 %Washington County: 91.2 %York County: 95.1 %
  • Under 92
  • 92 to 94
  • 94 to 95
  • 95 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2023

Cumberland County: 96.5 %Cumberland County96.5York County: 95.1 %York County95.1Hancock County: 95 %Hancock County95Lincoln County: 94.9 %Lincoln County94.9Kennebec County: 94.8 %Kennebec County94.8Sagadahoc County: 94.8 %Sagadahoc County94.8Penobscot County: 94.5 %Penobscot County94.5Knox County: 94.3 %Knox County94.3Franklin County: 93.8 %Franklin County93.8Waldo County: 93.7 %Waldo County93.7Somerset County: 92.9 %Somerset County92.9Oxford County: 92.6 %Oxford County92.6Androscoggin County: 92.5 %Androscoggin County92.5Piscataquis County: 92 %Piscataquis County92Aroostook County: 91.2 %Aroostook County91.2Washington County: 91.2 %Washington County91.2Cumberland County: 96.5 %Cumberland County96.5York County: 95.1 %York County95.1Hancock County: 95 %Hancock County95Lincoln County: 94.9 %Lincoln County94.9Kennebec County: 94.8 %Kennebec County94.8Sagadahoc County: 94.8 %Sagadahoc County94.8Penobscot County: 94.5 %Penobscot County94.5Knox County: 94.3 %Knox County94.3Franklin County: 93.8 %Franklin County93.8Waldo County: 93.7 %Waldo County93.7Somerset County: 92.9 %Somerset County92.9Oxford County: 92.6 %Oxford County92.6Androscoggin County: 92.5 %Androscoggin County92.5Piscataquis County: 92 %Piscataquis County92Aroostook County: 91.2 %Aroostook County91.2Washington County: 91.2 %Washington County91.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Cumberland County96.5+0.3 pts
2York County95.1+0.4 pts
3Hancock County95-0.1 pts
4Lincoln County94.9+0.1 pts
5Kennebec County94.8+0.3 pts
6Sagadahoc County94.8+0.5 pts
7Penobscot County94.5+0.6 pts
8Knox County94.3+0.6 pts
9Franklin County93.8-0.1 pts
10Waldo County93.7+0.5 pts
11Somerset County92.9+1 pts
12Oxford County92.6+1.5 pts
13Androscoggin County92.5+0.5 pts
14Piscataquis County92-0 pts
15Aroostook County91.2+0.6 pts
16Washington County91.2+0.2 pts

Other periods

About this ranking

People aged 25 and over who hold a regular high school diploma, a GED or alternative credential, or any higher level of education, 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.

Measures the adult population, not students: it is not the high school graduation rate of a class. Not comparable with the EU share below upper secondary education, which covers ages 25 to 64.

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 high school diploma, GED 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/2023/table-based-SF/data/5YRData/acsdt5y2023-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 high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs (Counties in Maine by high school graduate or higher, population 25 and over, 2023) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat

MLA 9

American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Maine by high school graduate or higher, population 25 and over, 2023. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/maine-counties?period=2023. 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 high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Counties in Maine by high school graduate or higher, population 25 and over, 2023. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/maine-counties?period=2023.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Maine by high school graduate or higher, population 25 and over, 2023 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat, via Invokely: https://invokely.ai/rankings/high-school-graduate-or-higher/maine-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_by_2023,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Maine by high school graduate or higher, population 25 and over, 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/maine-counties?period=2023. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED 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/2023/table-based-SF/data/5YRData/acsdt5y2023-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 high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Maine by high school graduate or higher, population 25 and over, 2023
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat
L2  - https://invokely.ai/rankings/high-school-graduate-or-higher/maine-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/maine-counties?period=2023.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED 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/2023/table-based-SF/data/5YRData/acsdt5y2023-b15003.dat. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest high school graduate or higher, population 25 and over?

Cumberland County, with 96.5% in 2023, according to the U.S. Census Bureau.

Which county has the lowest high school graduate or higher, population 25 and over?

Washington County, with 91.2% in 2023.

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 high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Retrieved 2026-10-12.

High school graduate or higher, population 25 and over: other rankings

Counties in Maine: more rankings