| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O'Brien | city | Florida | United States | 30.04 | -82.94 | 59 | |
| O'Hara | city | Florida | United States | 28.01 | -82.23 | 95 | |
| O'Neil | city | Florida | United States | 30.62 | -81.51 | 13 | |
| O'Ryans Point on Half Moon Lake | city | Florida | United States | 28.10 | -82.55 | 45 |