| City Name | County | Zip Code |
| Union Bridge | Carroll | 21791 |
| Union Mills | Carroll | 21158 |
| Uniontown | Carroll | 21158 |
| Unionville | Frederick | 21792 |
| Unity | Montgomery | 20833 |
| University Park | Prince George's | 20782 |
| Upper Crossroads | Harford | 21047 |
| Upper Fairmont | Somerset | 21867 |
| Upper Falls | Baltimore | 21156 |
| Upper Marlboro | Prince George's | ***** |
| Upperco | Baltimore | 21155 |
| Utica | Frederick | 21788 |
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