| Orleans Parish, LA (County) |
| Orleans Township, IA (Township) |
| Orleans Township, MI (Township) |
| Orlien, ND (Township) |
| Orlinda, TN (Town) |
| Orme, TN (Town) |
| Ormond Beach , FL (City) |
| Ormsby, MN (City) |
| Oro Valley, AZ (Town) |
| Orofino, ID (City) |
| Orono, MN (City) |
| Orono, ME (Town) |
| Orono Township, IA (Township) |
| Oronoco, MN (City) |
| Oronoco, MN (Township) |
