| Osage Township, IA (Township) |
| Osago, ND (Township) |
| Osakis, MN (City) |
| Osakis, MN (Township) |
| Osawatomie, KS (City) |
| Osawatomie, KS (Township) |
| Osborn, ME (Town) |
| Osborn, ND (Township) |
| Osborn, MO (City) |
| Osborn Town, WI (Town) |
| Osborne, KS (Township) |
| Osborne, KS (City) |
| Osborne, MN (Township) |
| Osborne County, KS (County) |
| Osburn, ID (City) |
