Ranking of Maine Cities and Places By Percentage of 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 percentage of the population of Maine (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 30.90%. Among all Maine cities and places with a population of 10K or higher, Lewiston city had the highest percentage of its population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (39.53%), followed by Sanford city (38.00%), and Augusta city (37.44%).

The chart below shows the top 10 Maine cities and places (with a population of 10K+), and the table below shows the ranking of all Maine cities and places (with a population of 10K+).

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 Cities and Places By Percentage of Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
Lewiston city
Sanford city
Augusta city
Biddeford city
Waterville city
Auburn city
Bangor city
Westbrook city
Saco city
South Portland city
Ranking of Maine Cities and Places By Percentage of Population (Aged 25yrs+) with an Educational Attainment of High School Graduate or Equivalent in 2021
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Rank City of Place Percentage of Population (Aged 25yrs+) (%)
1 Lewiston city 39.53
2 Sanford city 38.00
3 Augusta city 37.44
4 Biddeford city 33.67
5 Waterville city 30.82
6 Auburn city 30.39
7 Bangor city 28.73
8 Westbrook city 27.74
9 Saco city 24.24
10 South Portland city 22.39
11 Brunswick CDP 21.42
12 Portland city 14.28
13 Orono CDP 9.23