| Oconto Town, WI (Town) |
| Ocqueoc Township, MI (Township) |
| Octa, OH (Village) |
| Octavia, NE (Village) |
| Odebolt, IA (City) |
| Odee, KS (Township) |
| Odell, NE (Village) |
| Odell, IL (Village) |
| Odell Township, IL (Township) |
| Odem, TX (City) |
| Oden, AR (Town) |
| Odenville, AL (Town) |
| Odessa, NY (Village) |
| Odessa, MN (Township) |
| Odessa, MN (City) |
