| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Odiongan | city | Province of Iloilo | Philippines | 10.9833333 | 122.5 | 295 | 41140 |
| Odiongan | city | Province of Iloilo | Philippines | 11.3672222 | 123.1322222 | 0 | 13448 |
| Odioñgan | city | Province of Iloilo | Philippines | 10.9833333 | 122.5 | 295 | 41140 |
| Odioñgan | city | Province of Iloilo | Philippines | 11.3672222 | 123.1322222 | 0 | 13448 |
| Ogbo | city | Province of Iloilo | Philippines | 10.8666667 | 122.35 | 875 | 32068 |
| Olango | city | Province of Iloilo | Philippines | 10.7075 | 122.1808333 | 472 | 46710 |
| Olo-Baroc | city | Province of Iloilo | Philippines | 10.6833333 | 122.3666667 | 6 | 55419 |
| Olongo | city | Province of Iloilo | Philippines | 10.7075 | 122.1808333 | 472 | 46710 |
| Oluangan | city | Province of Iloilo | Philippines | 10.8272222 | 122.3697222 | 419 | 36955 |
| Oluañgan | city | Province of Iloilo | Philippines | 10.8272222 | 122.3697222 | 419 | 36955 |
| Omambong | city | Province of Iloilo | Philippines | 10.7547222 | 122.3947222 | 180 | 52451 |
| Omamoong | city | Province of Iloilo | Philippines | 10.7547222 | 122.3947222 | 180 | 52451 |
| Omio | city | Province of Iloilo | Philippines | 11.25 | 123.0166667 | 101 | 31881 |
| Onop | city | Province of Iloilo | Philippines | 10.65 | 122.2333333 | 13 | 29648 |
| Oracion | city | Province of Iloilo | Philippines | 10.6558333 | 122.5922222 | 331 | 37897 |
| Oracon | city | Province of Iloilo | Philippines | 10.6558333 | 122.5922222 | 331 | 37897 |
| Oracon | city | Province of Iloilo | Philippines | 10.4825 | 122.6019444 | 108 | 16528 |
| Orinoria | city | Province of Iloilo | Philippines | 10.8166667 | 122.4666667 | 259 | 57783 |
| Oton | city | Province of Iloilo | Philippines | 10.6930556 | 122.4736111 | 0 | 184123 |
| Oton Town | city | Province of Iloilo | Philippines | 10.6930556 | 122.4736111 | 0 | 184123 |
| Owak | city | Province of Iloilo | Philippines | 11.1166667 | 122.6166667 | 108 | 39371 |
| Oya-oy | city | Province of Iloilo | Philippines | 10.65 | 122.2333333 | 13 | 29648 |
| Oyanoyan | city | Province of Iloilo | Philippines | 10.85 | 122.45 | 344 | 41103 |
| Oyungan | city | Province of Iloilo | Philippines | 10.6333333 | 122.1833333 | 0 | 34394 |
| Oyungan | city | Province of Iloilo | Philippines | 10.6255556 | 122.1855556 | 0 | 34394 |
| Oyuñgan | city | Province of Iloilo | Philippines | 10.6333333 | 122.1833333 | 0 | 34394 |
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