| Rank | County | Percentage of Seniors |
|---|---|---|
| 1 | Barnstable County, Massachusetts | 26.3% |
| 2 | Berkshire County, Massachusetts | 19.7% |
| 3 | Dukes County, Massachusetts | 17.9% |
| 4 | Franklin County, Massachusetts | 16.5% |
| 5 | Norfolk County, Massachusetts | 15.1% |
| 6 | Plymouth County, Massachusetts | 15.1% |
| 7 | Bristol County, Massachusetts | 15.0% |
| 8 | Essex County, Massachusetts | 14.9% |
| 9 | Hampden County, Massachusetts | 14.8% |
| 10 | Hampshire County, Massachusetts | 13.7% |
| 11 | Middlesex County, Massachusetts | 13.5% |
| 12 | Worcester County, Massachusetts | 13.4% |
| 13 | Nantucket County, Massachusetts | 13.2% |
| 14 | Suffolk County, Massachusetts | 10.7% |
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