| Rank | County | Population Density |
|---|---|---|
| 1 | Suffolk County, Massachusetts | 12,415.7 |
| 2 | Middlesex County, Massachusetts | 1,837.9 |
| 3 | Norfolk County, Massachusetts | 1,693.6 |
| 4 | Essex County, Massachusetts | 1,508.8 |
| 5 | Bristol County, Massachusetts | 991.3 |
| 6 | Hampden County, Massachusetts | 751 |
| 7 | Plymouth County, Massachusetts | 750.9 |
| 8 | Barnstable County, Massachusetts | 548.3 |
| 9 | Worcester County, Massachusetts | 528.6 |
| 10 | Hampshire County, Massachusetts | 299.8 |
| 11 | Nantucket County, Massachusetts | 226.2 |
| 12 | Dukes County, Massachusetts | 160.2 |
| 13 | Berkshire County, Massachusetts | 141.6 |
| 14 | Franklin County, Massachusetts | 102.1 |
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