| Rank | County | Percentage with High School Diploma |
|---|---|---|
| 1 | Barnstable County, Massachusetts | 94.9% |
| 2 | Norfolk County, Massachusetts | 93.5% |
| 3 | Nantucket County, Massachusetts | 93.1% |
| 4 | Dukes County, Massachusetts | 92.7% |
| 5 | Hampshire County, Massachusetts | 92.3% |
| 6 | Plymouth County, Massachusetts | 91.9% |
| 7 | Middlesex County, Massachusetts | 91.8% |
| 8 | Franklin County, Massachusetts | 91.2% |
| 9 | Berkshire County, Massachusetts | 90.7% |
| 10 | Worcester County, Massachusetts | 88.7% |
| 11 | Essex County, Massachusetts | 88.4% |
| 12 | Hampden County, Massachusetts | 83.5% |
| 13 | Suffolk County, Massachusetts | 83.1% |
| 14 | Bristol County, Massachusetts | 80.6% |
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