| Rank | County | Housing Units |
|---|---|---|
| 1 | Middlesex County, Massachusetts | 614,036 |
| 2 | Worcester County, Massachusetts | 328,586 |
| 3 | Suffolk County, Massachusetts | 317,327 |
| 4 | Essex County, Massachusetts | 307,559 |
| 5 | Norfolk County, Massachusetts | 271,502 |
| 6 | Bristol County, Massachusetts | 231,083 |
| 7 | Plymouth County, Massachusetts | 201,419 |
| 8 | Hampden County, Massachusetts | 192,197 |
| 9 | Barnstable County, Massachusetts | 161,001 |
| 10 | Berkshire County, Massachusetts | 68,497 |
| 11 | Hampshire County, Massachusetts | 62,766 |
| 12 | Franklin County, Massachusetts | 33,806 |
| 13 | Dukes County, Massachusetts | 17,385 |
| 14 | Nantucket County, Massachusetts | 11,776 |
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