There are 29 cities in Ohio that start with the letter O.
City | 2024 Population |
|---|---|
| Oak Harbor | 2,792 |
| Oak Hill | 1,395 |
| Oakwood | 3,450 |
| Oakwood | 9,315 |
| Oakwood | 537 |
| Oberlin | 7,410 |
| Obetz | 7,453 |
| Oceola | 245 |
| Octa | 58 |
| Ohio City | 637 |
| Old Fort | 130 |
| Old Washington | 222 |
| Olde West Chester | 252 |
| Olmsted Falls | 8,564 |
| Ontario | 6,650 |
| Orange | 3,518 |
| Orangeville | 168 |
| Oregon | 19,638 |
| Orient | 243 |
| Orrville | 8,409 |
| Orwell | 1,508 |
| Osgood | 296 |
| Ostrander | 1,229 |
| Ottawa | 4,404 |
| Ottawa Hills | 4,781 |
| Ottoville | 970 |
| Otway | 89 |
| Owensville | 814 |
| Oxford | 22,104 |