| Otisco, NY (Town) |
| Otisco, MN (Township) |
| Otisco Township, MI (Township) |
| Otisfield, ME (Town) |
| Otisville, NY (Village) |
| Otisville, MI (Village) |
| Oto, IA (City) |
| Oto Township, IA (Township) |
| Otoe, NE (Village) |
| Otoe County, NE (County) |
| Otranto Township, IA (Township) |
| Otrey, MN (Township) |
| Otsego, MN (City) |
| Otsego, NY (Town) |
| Otsego, IN (Township) |
