| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oebalsan-dong | city | Seoul | Korea, Republic of (South) | 37.54 | 126.82 | 101 | 1145360 |
| Oebalsandong | city | Seoul | Korea, Republic of (South) | 37.54 | 126.82 | 101 | 1145360 |
| Oeoso-ri | city | Seoul | Korea, Republic of (South) | 37.54 | 126.80 | 42 | 1001346 |
| Ogin-dong | city | Seoul | Korea, Republic of (South) | 37.58 | 126.96 | 351 | 1347733 |
| Ogindong | city | Seoul | Korea, Republic of (South) | 37.58 | 126.96 | 351 | 1347733 |
| Ogok-dong | city | Seoul | Korea, Republic of (South) | 37.55 | 126.79 | 39 | 849240 |
| Ogok-tong | city | Seoul | Korea, Republic of (South) | 37.55 | 126.79 | 39 | 849240 |
| Ogokdong | city | Seoul | Korea, Republic of (South) | 37.55 | 126.79 | 39 | 849240 |
| Oksuil-tong | city | Seoul | Korea, Republic of (South) | 37.55 | 127.01 | 104 | 1267483 |
| Onsu-dong | city | Seoul | Korea, Republic of (South) | 37.67 | 127.06 | 154 | 1114061 |
| Onsudong | city | Seoul | Korea, Republic of (South) | 37.50 | 126.82 | 127 | 1421568 |
| Oreungadeum | city | Seoul | Korea, Republic of (South) | 33.47 | 126.39 | 183 | 15148 |
| Orgudong | city | Seoul | Korea, Republic of (South) | 37.48 | 126.83 | 91 | 1287537 |
| Oryu-gol | city | Seoul | Korea, Republic of (South) | 37.48 | 126.83 | 91 | 1287537 |
| Oryu-ri | city | Seoul | Korea, Republic of (South) | 37.48 | 126.83 | 91 | 1287537 |
| Oryudong | city | Seoul | Korea, Republic of (South) | 37.48 | 126.83 | 91 | 1287537 |
| Oryudong | city | Seoul | Korea, Republic of (South) | 37.50 | 126.84 | 91 | 1459000 |
| Osoe-dong | city | Seoul | Korea, Republic of (South) | 37.54 | 126.80 | 42 | 1001346 |
| Osoedong | city | Seoul | Korea, Republic of (South) | 37.54 | 126.80 | 42 | 1001346 |
| Osoeri | city | Seoul | Korea, Republic of (South) | 37.54 | 126.80 | 42 | 1001346 |