| Ouray County, CO (County) |
| Outagamie County, WI (County) |
| Outlook, MT (Town) |
| Ouzinkie, AK (City) |
| Overbrook, KS (City) |
| Overfield Township, PA (Township) |
| Overisel Township, MI (Township) |
| Overland, KS (Township) |
| Overland, MO (City) |
| Overland, ND (Township) |
| Overland Park, KS (City) |
| Overly, ND (City) |
| Overoaks Community Development District, FL (CDD) |
| Overton, NE (Village) |
| Overton, TX (City) |
