| Ola, SD (Township) |
| Olanta, SC (Town) |
| Olar, SC (Town) |
| Olathe, KS (City) |
| Olathe, KS (Township) |
| Olathe, CO (Town) |
| Old Appleton, MO (Town) |
| Old Bennington, VT (Village) |
| Old Bridge Township, NJ (Township) |
| Old Brookville, NY (Village) |
| Old Brownsboro Place, KY (City) |
| Old Field, NY (Village) |
| Old Forge, PA (Borough) |
| Old Fort, NC (Town) |
| Old Harbor, AK (City) |
