| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Ona | city | Province of Northern Samar | Philippines | 12.3419444 | 124.6780556 | 157 | 15559 |
| Onaon | city | Province of Leyte | Philippines | 11.0938889 | 124.3908333 | 150 | 30112 |
| Onat | city | Province of Aklan | Philippines | 11.7655556 | 122.1586111 | 78 | 27586 |
| Onay | city | Province of Northern Samar | Philippines | 12.5833333 | 125 | 0 | 14775 |
| Once | city | Angeles City | Philippines | 14.6008333 | 121.0319444 | 98 | 2355171 |
| Ondol | city | Province of Bohol | Philippines | 10.05 | 124.0666667 | 45 | 21825 |
| Ondol | city | Province of Bohol | Philippines | 9.9527778 | 124.5358333 | 173 | 30838 |
| Ondoy | city | Province of Aklan | Philippines | 11.8191667 | 122.1261111 | 62 | 20799 |
| Ongca | city | Province of Cebu | Philippines | 10.0711111 | 123.5475 | 1686 | 56674 |
| Onglo | city | Province of Albay | Philippines | 13.35 | 123.7166667 | 82 | 78324 |
| Ongo | city | Province of Albay | Philippines | 13.1397222 | 123.52 | 659 | 52594 |
| Ongo | city | Province of Bohol | Philippines | 9.8727778 | 124.2083333 | 626 | 21150 |
| Ongol | city | Province of Capiz | Philippines | 11.2833333 | 122.6833333 | 75 | 26418 |
| Ongong | city | Province of Palawan | Philippines | 8.4283333 | 117.2622222 | 82 | 2924 |
| Ongos | city | Province of Camarines Norte | Philippines | 14.2833333 | 122.7333333 | 157 | 35982 |
| Onom | city | Province of Bohol | Philippines | 9.8 | 124.1166667 | 793 | 20210 |
| Onop | city | Province of Iloilo | Philippines | 10.65 | 122.2333333 | 13 | 29648 |
| Ontambo | city | Province of Pangasinan | Philippines | 16.0833333 | 120.4166667 | 101 | 137318 |
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