| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Op'o | city | Kyongsang-namdo | Korea, Republic of (South) | 34.7030556 | 128.6052778 | 0 | 8057 |
| Op'o | city | | Korea, Republic of (South) | 34.7 | 128.6166667 | 0 | 8057 |
| Op'yong-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.05 | 128.3166667 | 564 | 17690 |
| Op'yŏng-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.05 | 128.3166667 | 564 | 17690 |
| Opcha-dong | city | Cholla-namdo | Korea, Republic of (South) | 34.6333333 | 126.5 | 52 | 10999 |
| Opcha-ri | city | Cholla-namdo | Korea, Republic of (South) | 34.6333333 | 126.5 | 52 | 10999 |
| Oppat | city | Kyongsang-bukto | Korea, Republic of (South) | 36 | 128.5166667 | 1099 | 165786 |
| Oppat | city | Kyongsang-bukto | Korea, Republic of (South) | 35.7613889 | 129.091667 | 1036 | 17756 |
| Oppawi | city | Kangwon-do | Korea, Republic of (South) | 37.8333333 | 127.6833333 | 472 | 9506 |
| Oppol | city | Inch'on-gwangyoksi | Korea, Republic of (South) | 37.2447222 | 126.4436111 | 0 | 14330 |
| Optong | city | | Korea, Republic of (South) | 34.9666667 | 127.5 | 610 | 21290 |
| Optong-ni | city | | Korea, Republic of (South) | 34.9666667 | 127.5 | 610 | 21290 |