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 2022, at 96.3%. Aroostook County had the lowest, at 90.6%. The median was 93.8% and the figure for Maine was 94.1%. Source: the U.S. Census Bureau.

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Highest96.3Cumberland County
Lowest90.6Aroostook County
Median93.816 counties
Maine94.1History

Map of counties, 2022

Androscoggin County: 92 %Aroostook County: 90.6 %Cumberland County: 96.3 %Franklin County: 93.9 %Hancock County: 95.1 %Kennebec County: 94.6 %Knox County: 93.7 %Lincoln County: 94.8 %Oxford County: 91.1 %Penobscot County: 93.9 %Piscataquis County: 92 %Sagadahoc County: 94.3 %Somerset County: 91.8 %Waldo County: 93.2 %Washington County: 90.9 %York County: 94.7 %
  • Under 92
  • 92 to 93
  • 93 to 94
  • 94 to 95
  • 95 and over
%, 2022. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2022

Cumberland County: 96.3 %Cumberland County96.3Hancock County: 95.1 %Hancock County95.1Lincoln County: 94.8 %Lincoln County94.8York County: 94.7 %York County94.7Kennebec County: 94.6 %Kennebec County94.6Sagadahoc County: 94.3 %Sagadahoc County94.3Penobscot County: 93.9 %Penobscot County93.9Franklin County: 93.9 %Franklin County93.9Knox County: 93.7 %Knox County93.7Waldo County: 93.2 %Waldo County93.2Piscataquis County: 92 %Piscataquis County92Androscoggin County: 92 %Androscoggin County92Somerset County: 91.8 %Somerset County91.8Oxford County: 91.1 %Oxford County91.1Washington County: 90.9 %Washington County90.9Aroostook County: 90.6 %Aroostook County90.6Cumberland County: 96.3 %Cumberland County96.3Hancock County: 95.1 %Hancock County95.1Lincoln County: 94.8 %Lincoln County94.8York County: 94.7 %York County94.7Kennebec County: 94.6 %Kennebec County94.6Sagadahoc County: 94.3 %Sagadahoc County94.3Penobscot County: 93.9 %Penobscot County93.9Franklin County: 93.9 %Franklin County93.9Knox County: 93.7 %Knox County93.7Waldo County: 93.2 %Waldo County93.2Piscataquis County: 92 %Piscataquis County92Androscoggin County: 92 %Androscoggin County92Somerset County: 91.8 %Somerset County91.8Oxford County: 91.1 %Oxford County91.1Washington County: 90.9 %Washington County90.9Aroostook County: 90.6 %Aroostook County90.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1Cumberland County96.3+0.6 pts
2Hancock County95.1-0.2 pts
3Lincoln County94.8+0.9 pts
4York County94.7+0.3 pts
5Kennebec County94.6+0.8 pts
6Sagadahoc County94.3+0.2 pts
7Penobscot County93.9+0.4 pts
8Franklin County93.9+0.2 pts
9Knox County93.7+0.1 pts
10Waldo County93.2+0.1 pts
11Piscataquis County92+0.6 pts
12Androscoggin County92+0.2 pts
13Somerset County91.8+0.8 pts
14Oxford County91.1-0.7 pts
15Washington County90.9-0.2 pts
16Aroostook County90.6+0.3 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/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 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, 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 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, 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/high-school-graduate-or-higher/maine-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 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, 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/high-school-graduate-or-higher/maine-counties?period=2022.

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, 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/high-school-graduate-or-higher/maine-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maine_by_2022,
  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, 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/high-school-graduate-or-higher/maine-counties?period=2022. 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/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 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, 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/high-school-graduate-or-higher/maine-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/maine-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 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/2022/table-based-SF/data/5YRData/acsdt5y2022-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 96.3% in 2022, according to the U.S. Census Bureau.

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

Aroostook County, with 90.6% 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 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