| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Обуда | city | Budapest | Hungary | 47.55 | 19.03 | 278 | 328406 |
| Орослане | city | Komarom-Esztergom | Hungary | 47.49 | 18.31 | 830 | 22234 |
| Орошхаза | city | Bekes | Hungary | 46.57 | 20.67 | 305 | 18204 |
| Острогон | city | Komarom-Esztergom | Hungary | 47.79 | 18.74 | 830 | 32091 |
| Оча | city | Pest | Hungary | 47.30 | 19.23 | 337 | 13798 |