| Oglesby, TX (City) |
| Oglesby, IL (City) |
| Oglethorpe, GA (City) |
| Oglethorpe County, GA (County) |
| Ogunquit, ME (Town) |
| Ohatchee, AL (Town) |
| Ohio, IL (Village) |
| Ohio, NY (Town) |
| Ohio, SD (Township) |
| Ohio, OH (State) |
| Ohio, KS (Township) |
| Ohio, KS (Township) |
| Ohio, KS (Township) |
| Ohio, KS (Township) |
| Ohio, KS (Township) |
