Ranking of Maine Counties By Population Aged 25 years and above with an Educational attainment of High School Graduate or Equivalent in 2021 (ACS-5Yrs)

Updated on September 3, 2025.

Based on the US Census ACS-5Yrs estimates, in 2021, the population of Maine (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 307,382. Among all Maine counties, York County had the highest population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (46,592), followed by Cumberland County (44,666), and Penobscot County (35,630).

The chart below shows the top 10 Maine counties, and the table below shows the ranking of all Maine counties.

You can see similar information for other educational attainments.

You can also see similar information for other states and for the United States.

Ranking of Maine Counties By Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
York County
Cumberland County
Penobscot County
Kennebec County
Androscoggin County
Aroostook County
Oxford County
Somerset County
Hancock County
Knox County
Ranking of Maine Counties By Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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Rank County Number of People
1 York County 46592
2 Cumberland County 44666
3 Penobscot County 35630
4 Kennebec County 30621
5 Androscoggin County 27322
6 Aroostook County 18973
7 Oxford County 17591
8 Somerset County 15546
9 Hancock County 13222
10 Knox County 9759
11 Waldo County 9530
12 Lincoln County 8609
13 Washington County 8588
14 Sagadahoc County 7851
15 Franklin County 7839
16 Piscataquis County 5043