| Ortley, SD (Town) |
| Orton, MN (Township) |
| Ortonville, MN (Township) |
| Ortonville, MN (City) |
| Ortonville, MI (Village) |
| Orvil Township, IL (Township) |
| Orwell, NY (Town) |
| Orwell, MN (Township) |
| Orwell, OH (Village) |
| Orwell, VT (Town) |
| Orwell Township, OH (Township) |
| Orwell Township, PA (Township) |
| Orwigsburg, PA (Borough) |
| Osage, IA (City) |
| Osage, MN (Township) |
