| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Union Chapel | city | Massachusetts | United States | 42.18417 | -72.03389 | 764 | 11378 |
| Union Hill | city | Massachusetts | United States | 42.25139 | -71.79167 | 597 | 165772 |
| Unionville | city | Massachusetts | United States | 42.35833 | -71.83889 | 626 | 26262 |
| Unionville | city | Massachusetts | United States | 42.09083 | -71.425 | 249 | 37157 |
| University Highlands | city | Massachusetts | United States | 41.62417 | -71.00139 | 52 | 20285 |
| University Park | city | Massachusetts | United States | 42.25 | -71.81667 | 498 | 135205 |
| Uphams Corner | city | Massachusetts | United States | 42.31667 | -71.06111 | 36 | 429571 |
| Upper Four Corners | city | Massachusetts | United States | 41.86806 | -70.93194 | 85 | 16014 |
| Upper Green | city | Massachusetts | United States | 42.79306 | -70.86111 | 49 | 25445 |
| Upper Hill | city | Massachusetts | United States | 42.10972 | -72.55417 | 190 | 169241 |
| Upper Wire Village | city | Massachusetts | United States | 42.27222 | -71.97722 | 846 | 15291 |
| Upton | city | Massachusetts | United States | 42.17444 | -71.60278 | 324 | 18234 |
| Uxbridge | city | Massachusetts | United States | 42.07722 | -71.63 | 334 | 17671 |
|
|