UpAlphabetical listing of Places in Ilocos Sur
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|
| Oaig Daya | city | Ilocos Sur | Philippines | 17.18 | 120.45 | 52 | 47719 |
| Oalin | city | Ilocos Sur | Philippines | 17.25 | 120.52 | 255 | 20657 |
| Olo-Olo Norte | city | Ilocos Sur | Philippines | 17.28 | 120.45 | 114 | 33080 |
| Olo-Olo Sur | city | Ilocos Sur | Philippines | 17.27 | 120.45 | 246 | 32200 |
| Olo-olo | city | Ilocos Sur | Philippines | 17.28 | 120.45 | 114 | 33080 |
| Ora | city | Ilocos Sur | Philippines | 17.60 | 120.41 | 16 | 80151 |
| Orence | city | Ilocos Sur | Philippines | 17.42 | 120.49 | 82 | 53543 |
| Orense | city | Ilocos Sur | Philippines | 17.42 | 120.49 | 82 | 53543 |
| Oribi | city | Ilocos Sur | Philippines | 17.51 | 120.40 | 0 | 45715 |
| Ortoc | city | Ilocos Sur | Philippines | 17.78 | 120.49 | 150 | 41087 |
| Oso | city | Ilocos Sur | Philippines | 16.95 | 120.55 | 1056 | 11603 |
| Otol | city | Ilocos Sur | Philippines | 17.62 | 120.39 | 16 | 56248 |
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