| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oa (historical) | city | American Samoa | United States | -14.26 | -170.64 | 3 | |
| Oa Giun | city | Quang Binh | Vietnam | 17.67 | 105.98 | 1669 | 10399 |
| Oa Mo Cong | city | Phongsali | Laos | 21.38 | 102.22 | 5285 | 1341 |
| Oa Tai | city | Phongsali | Laos | 21.83 | 102.32 | 2509 | 447 |