Ranking of Maine Counties By Percentage of Population Aged 25 years and above with an Educational attainment of Less than High School Diploma 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 Less than High School Diploma was 6.29%. Among all Maine counties, Aroostook County had the highest percentage of its population (aged 25 years and above) with an educational attainment of Less than High School Diploma (9.63%), followed by Somerset County (8.99%), and Washington County (8.82%).
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.
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Related Topics: Maine ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Maine Counties By Percentage of Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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| Rank | County | Percentage of Population (Aged 25yrs+) (%) |
|---|---|---|
| 1 | Aroostook County | 9.63 |
| 2 | Somerset County | 8.99 |
| 3 | Washington County | 8.82 |
| 4 | Piscataquis County | 8.62 |
| 5 | Androscoggin County | 8.21 |
| 6 | Oxford County | 8.17 |
| 7 | Waldo County | 6.94 |
| 8 | Penobscot County | 6.45 |
| 9 | Knox County | 6.41 |
| 10 | Franklin County | 6.28 |
| 11 | Kennebec County | 6.21 |
| 12 | Lincoln County | 6.08 |
| 13 | Sagadahoc County | 5.90 |
| 14 | York County | 5.61 |
| 15 | Hancock County | 4.78 |
| 16 | Cumberland County | 4.33 |