Ranking of Massachusetts Counties By 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 population of Massachusetts (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 433,215. Among all Massachusetts counties, Middlesex County had the highest population (aged 25 years and above) with an educational attainment of Less than High School Diploma (73,449), followed by Suffolk County (71,809), and Essex County (57,431).
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 Less than High School Diploma in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Middlesex County | 73449 |
| 2 | Suffolk County | 71809 |
| 3 | Essex County | 57431 |
| 4 | Bristol County | 57348 |
| 5 | Worcester County | 50122 |
| 6 | Hampden County | 44183 |
| 7 | Norfolk County | 29456 |
| 8 | Plymouth County | 25872 |
| 9 | Barnstable County | 7686 |
| 10 | Berkshire County | 6625 |
| 11 | Hampshire County | 4744 |
| 12 | Franklin County | 3450 |
| 13 | Dukes County | 652 |
| 14 | Nantucket County | 388 |