O
| Community | County | ||
| Oak Grove | Murray | ||
| Oak Grove | Pawnee | ||
| Oak Grove | Payne | ||
| Oak Hill | McCurtain | ||
| Oakhurst | Tulsa and Creek | ||
| Oakman | Pontotoc | ||
| † | Oak Park | Washington | |
| Oakridge | Creek | ||
| Oberlin | Bryan | ||
| Octavia | Le Flore | ||
| Oglesby | Washington | ||
| Oil Center | Pontotoc | ||
| Oil City | Carter | ||
| Okesa | Osage | ||
| Okfuskee | Okfuskee | ||
| Oleta | Pushmataha | ||
| Olive | Creek | ||
| Olney | Coal | ||
| Omega | Kingfisher | ||
| Onapa | McIntosh | ||
| Oneta | Wagoner | ||
| Oney | Caddo | ||
| Ord | Choctaw | ||
| Orienta | Major | ||
| † | Orin | Grant | |
| Orion | Major | ||
| Orr | Love | ||
| † | Osage | Kay | |
| Oscar | Jefferson | ||
| Oswalt | Love | ||
| Otoe | Noble | ||
| Overbrook | Love | ||
| Owanda | Oklahoma | ||
| † Geographic or historic reference undetermined. | |||
Read more about this topic: List Of Unincorporated Communities In Oklahoma