| Umatilla County, OR (County) |
| Umber View Heights, MO (Village) |
| Unadilla, NE (Village) |
| Unadilla, GA (City) |
| Unadilla, NY (Town) |
| Unadilla, NY (Village) |
| Unadilla Township, MI (Township) |
| Unalakleet, AK (City) |
| Unalaska , AK (City) |
| Uncertain, TX (City) |
| Underhill, VT (Town) |
| Underhill Town, WI (Town) |
| Underwood, ND (City) |
| Underwood, MN (Township) |
| Underwood, IA (City) |
