| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Obayan | city | Province of Samar | Philippines | 11.6030556 | 125.083333 | 334 | 9273 |
| Obo | city | Province of Samar | Philippines | 11.6419444 | 124.7591667 | 334 | 17479 |
| Obrero | city | Province of Samar | Philippines | 11.9838889 | 124.8466667 | 164 | 13052 |
| Odoc | city | Province of Samar | Philippines | 11.25 | 125.1666667 | 98 | 4542 |
| Odoc | city | Province of Samar | Philippines | 11.1413889 | 125.2058333 | 331 | 2587 |
| Oeste | city | Province of Samar | Philippines | 11.9155556 | 124.6397222 | 3 | 1353 |
| Olayan | city | Province of Samar | Philippines | 11.5447222 | 124.9002778 | 114 | 14011 |
| Old Balugo | city | Province of Samar | Philippines | 11.9061111 | 124.8213889 | 167 | 23043 |
| Old Mahayag | city | Province of Samar | Philippines | 11.8441667 | 124.8219444 | 160 | 24365 |
| Old Manunca | city | Province of Samar | Philippines | 11.4363889 | 125.0152778 | 167 | 17359 |
| Old San Agustin | city | Province of Samar | Philippines | 11.3336111 | 125.0972222 | 101 | 7445 |
| Old Santa Cruz | city | Province of Samar | Philippines | 11.9061111 | 124.8213889 | 167 | 23043 |
| Opung | city | Province of Samar | Philippines | 11.9616667 | 124.6966667 | 3 | 8107 |
| Osemena | city | Province of Samar | Philippines | 11.1911111 | 125.1913889 | 137 | 3498 |
| Osmena | city | Province of Samar | Philippines | 11.7166667 | 125.0666667 | 590 | 6945 |
| Osmena | city | Province of Samar | Philippines | 11.1911111 | 125.1913889 | 137 | 3498 |
| Osmenia | city | Province of Samar | Philippines | 11.1911111 | 125.1913889 | 137 | 3498 |
| Osmeña | city | Province of Samar | Philippines | 11.7166667 | 125.0666667 | 590 | 6945 |
| Osmeña | city | Province of Samar | Philippines | 11.1911111 | 125.1913889 | 137 | 3498 |
| Otoc | city | Province of Samar | Philippines | 11.6013889 | 125.0308333 | 314 | 9909 |
| Oyandic | city | Province of Samar | Philippines | 11.7752778 | 124.9811111 | 0 | 15448 |
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