| County | Total Population |
| Middlesex |  1,537,149 |
| Worcester | 805,353 |
| Essex | 755,970 |
| Suffolk | 746,039 |
| Norfolk | 682,078 |
| Bristol | 550,856 |
| Plymouth | 498,393 |
| Hampden | 465,997 |
| Barnstable | 214,947 |
| Hampshire | 159,791 |
| Berkshire | 130,120 |
| Franklin | 71,535 |
| Dukes | 16,834 |
| Nantucket | 10,241 |