| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Union | city | Maine | United States | 44.21139 | -69.27472 | 32 | 2001 |
| Union Falls | city | Maine | United States | 43.57083 | -70.56028 | 98 | 4923 |
| Unionville | city | Maine | United States | 44.57889 | -67.99083 | 147 | 1209 |
| Unity | city | Maine | United States | 44.61111 | -69.335 | 269 | 1284 |
| Upper Abbot | city | Maine | United States | 45.205 | -69.46417 | 396 | 418 |
| Upper Dam | city | Maine | United States | 44.88389 | -70.86222 | 1469 | 38 |
| Upper Frenchville | city | Maine | United States | 47.28 | -68.425 | 531 | 1821 |
| Upper Gloucester | city | Maine | United States | 43.98917 | -70.295 | 364 | 3773 |
| Upper Landing | city | Maine | United States | 43.32944 | -70.56722 | 26 | 3716 |
| Upper Shirley Corner | city | Maine | United States | 45.37528 | -69.59583 | 1197 | 424 |
| Upper Village historical | city | Maine | United States | 43.80278 | -70.19528 | 82 | 11391 |
| Upton | city | Maine | United States | 44.69417 | -71.01111 | 1797 | 107 |
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