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, 2024

Cumberland County had the highest high school graduate or higher, population 25 and over of 16 counties in 2024, at 96.8%. Washington County had the lowest, at 91.1%. The median was 94.4% and the figure for Maine was 94.8%. Source: the U.S. Census Bureau.

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Highest96.8Cumberland County
Lowest91.1Washington County
Median94.416 counties
Maine94.8History

Map of counties, 2024

Androscoggin County: 93.1 %Aroostook County: 91.1 %Cumberland County: 96.8 %Franklin County: 94.1 %Hancock County: 95.6 %Kennebec County: 94.9 %Knox County: 94.8 %Lincoln County: 95 %Oxford County: 92.6 %Penobscot County: 94.8 %Piscataquis County: 91.4 %Sagadahoc County: 95.7 %Somerset County: 93.2 %Waldo County: 93.6 %Washington County: 91.1 %York County: 95.4 %
  • Under 93
  • 93 to 94
  • 94 to 95
  • 95 and over
%, 2024. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2024

Cumberland County: 96.8 %Cumberland County96.8Sagadahoc County: 95.7 %Sagadahoc County95.7Hancock County: 95.6 %Hancock County95.6York County: 95.4 %York County95.4Lincoln County: 95 %Lincoln County95Kennebec County: 94.9 %Kennebec County94.9Knox County: 94.8 %Knox County94.8Penobscot County: 94.8 %Penobscot County94.8Franklin County: 94.1 %Franklin County94.1Waldo County: 93.6 %Waldo County93.6Somerset County: 93.2 %Somerset County93.2Androscoggin County: 93.1 %Androscoggin County93.1Oxford County: 92.6 %Oxford County92.6Piscataquis County: 91.4 %Piscataquis County91.4Aroostook County: 91.1 %Aroostook County91.1Washington County: 91.1 %Washington County91.1Cumberland County: 96.8 %Cumberland County96.8Sagadahoc County: 95.7 %Sagadahoc County95.7Hancock County: 95.6 %Hancock County95.6York County: 95.4 %York County95.4Lincoln County: 95 %Lincoln County95Kennebec County: 94.9 %Kennebec County94.9Knox County: 94.8 %Knox County94.8Penobscot County: 94.8 %Penobscot County94.8Franklin County: 94.1 %Franklin County94.1Waldo County: 93.6 %Waldo County93.6Somerset County: 93.2 %Somerset County93.2Androscoggin County: 93.1 %Androscoggin County93.1Oxford County: 92.6 %Oxford County92.6Piscataquis County: 91.4 %Piscataquis County91.4Aroostook County: 91.1 %Aroostook County91.1Washington County: 91.1 %Washington County91.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Cumberland County96.8+0.3 pts
2Sagadahoc County95.7+1 pts
3Hancock County95.6+0.6 pts
4York County95.4+0.3 pts
5Lincoln County95+0.1 pts
6Kennebec County94.90 pts
7Knox County94.8+0.5 pts
8Penobscot County94.8+0.2 pts
9Franklin County94.1+0.3 pts
10Waldo County93.6-0.1 pts
11Somerset County93.2+0.4 pts
12Androscoggin County93.1+0.7 pts
13Oxford County92.6-0 pts
14Piscataquis County91.4-0.6 pts
15Aroostook County91.1-0.1 pts
15Washington County91.1-0.1 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/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 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, 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 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, 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/high-school-graduate-or-higher/maine-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 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, 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/high-school-graduate-or-higher/maine-counties.

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

BibTeX
@misc{census_counties_in_maine_by_2024,
  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, 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/high-school-graduate-or-higher/maine-counties. 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/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 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, 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/high-school-graduate-or-higher/maine-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/maine-counties.
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/2024/table-based-SF/data/5YRData/acsdt5y2024-b15003.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Maine by high school graduate or higher, population 25 and over using official data, and cite the source.
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Questions

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

Cumberland County, with 96.8% in 2024, according to the U.S. Census Bureau.

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

Washington County, with 91.1% 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 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