12 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Gloucester city | Essex County | 30,211 |
| Gardner city | Worcester County | 21,030 |
| Grafton town | Worcester County | 20,203 |
| Groton town | Middlesex County | 11,393 |
| Georgetown town | Essex County | 8,518 |
| Great Barrington town | Berkshire County | 7,130 |
| Groveland town | Essex County | 6,793 |
| Granby town | Hampshire County | 6,038 |
| Gill town | Franklin County | 1,540 |
| Granville town | Hampden County | 1,519 |
| Goshen town | Hampshire County | 934 |
| Gosnold town | Dukes County | 65 |