| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Obo | city | Province of Catanduanes | Philippines | 13.7166667 | 124.25 | 643 | 14333 |
| Obo | city | Province of Catanduanes | Philippines | 13.65 | 124.2833333 | 987 | 26931 |
| Oco | city | Province of Catanduanes | Philippines | 13.8480556 | 124.2852778 | 357 | 18079 |
| Oga | city | Province of Catanduanes | Philippines | 14 | 124.1666667 | 419 | 14543 |
| Ogbong | city | Province of Catanduanes | Philippines | 13.8733333 | 124.3313889 | 305 | 16758 |
| Oguis | city | Province of Catanduanes | Philippines | 13.6202778 | 124.2933333 | 3 | 22111 |
| Osmena | city | Province of Catanduanes | Philippines | 13.8530556 | 124.305 | 574 | 16758 |
| OsmeƱa | city | Province of Catanduanes | Philippines | 13.8530556 | 124.305 | 574 | 16758 |
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