Ranking of Massachusetts 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 Massachusetts (aged 25 years and above) who had an educational attainment of High School Graduate or Equivalent was 1,137,085. Among all Massachusetts counties, Middlesex County had the highest population (aged 25 years and above) with an educational attainment of High School Graduate or Equivalent (206,435), followed by Worcester County (159,573), and Essex County (136,493).
The chart below shows the top 10 Massachusetts counties, and the table below shows the ranking of all Massachusetts 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: Massachusetts ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Massachusetts 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 | Middlesex County | 206435 |
| 2 | Worcester County | 159573 |
| 3 | Essex County | 136493 |
| 4 | Bristol County | 122075 |
| 5 | Suffolk County | 115175 |
| 6 | Plymouth County | 98953 |
| 7 | Hampden County | 96780 |
| 8 | Norfolk County | 91670 |
| 9 | Barnstable County | 39626 |
| 10 | Berkshire County | 27808 |
| 11 | Hampshire County | 21612 |
| 12 | Franklin County | 15077 |
| 13 | Dukes County | 3945 |
| 14 | Nantucket County | 1863 |