| City | County | 2026 Pop. ↓ |
|---|---|---|
| Attleboro | Bristol County | 47,620 |
| Arlington | Middlesex County | 46,426 |
| Andover | Essex County | 36,968 |
| Agawam Town | Hampden County | 28,852 |
| Acton | Middlesex County | 25,114 |
| Ashland | Middlesex County | 19,115 |
| Auburn | Worcester County | 17,572 |
| Abington | Plymouth County | 17,126 |
| Athol | Worcester County | 12,151 |
| Acushnet | Bristol County | 10,830 |
| Ayer | Middlesex County | 9,443 |
| Adams | Berkshire County | 7,866 |
| Ashburnham | Worcester County | 6,573 |
| Avon | Norfolk County | 4,962 |
| Ashby | Middlesex County | 3,270 |
| Ashfield | Franklin County | 1,678 |
| Alford | Berkshire County | 484 |
| Aquinnah | Dukes County | 446 |