| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Och'ong-gol | city | Daejeon | Korea, Republic of (South) | 36.28 | 127.43 | 830 | 315090 |
| Odae | city | Daejeon | Korea, Republic of (South) | 36.48 | 127.39 | 98 | 119798 |
| Odong | city | Daejeon | Korea, Republic of (South) | 36.42 | 127.54 | 301 | 67680 |
| Odong | city | Daejeon | Korea, Republic of (South) | 36.42 | 127.52 | 203 | 94577 |
| Oesamdong | city | Daejeon | Korea, Republic of (South) | 36.40 | 127.32 | 367 | 68081 |
| Okgyedong | city | Daejeon | Korea, Republic of (South) | 36.30 | 127.45 | 301 | 246473 |
| Okkye-dong | city | Daejeon | Korea, Republic of (South) | 36.30 | 127.45 | 301 | 246473 |
| Oksan | city | Daejeon | Korea, Republic of (South) | 36.33 | 127.33 | 288 | 118148 |
| Ondong | city | Daejeon | Korea, Republic of (South) | 36.24 | 127.32 | 387 | 407526 |
| Ongmae | city | Daejeon | Korea, Republic of (South) | 36.31 | 127.41 | 830 | 278816 |
| Ongmoe | city | Daejeon | Korea, Republic of (South) | 36.31 | 127.41 | 830 | 278816 |
| Origol | city | Daejeon | Korea, Republic of (South) | 36.35 | 127.49 | 367 | 237123 |
| Oriul | city | Daejeon | Korea, Republic of (South) | 36.22 | 127.32 | 830 | 396353 |
| Oryonggol | city | Daejeon | Korea, Republic of (South) | 36.25 | 127.35 | 383 | 453565 |
| Oryongi | city | Daejeon | Korea, Republic of (South) | 36.42 | 127.40 | 170 | 159474 |
| Oun-dong | city | Daejeon | Korea, Republic of (South) | 36.37 | 127.35 | 104 | 109016 |
| Oyak-kol | city | Daejeon | Korea, Republic of (South) | 36.46 | 127.38 | 170 | 101991 |
| Oyatgol | city | Daejeon | Korea, Republic of (South) | 36.46 | 127.38 | 170 | 101991 |