| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Orak-tong | city | Chungnam | Korea, Republic of (South) | 36.55 | 126.38 | 0 | 3962 |
| Ori-gol | city | Chungnam | Korea, Republic of (South) | 36.72 | 126.41 | 36 | 20589 |
| Ori-gol | city | Chungnam | Korea, Republic of (South) | 36.58 | 126.55 | 3 | 15865 |
| Ori-gol | city | Chungnam | Korea, Republic of (South) | 36.88 | 127.03 | 72 | 18504 |
| Origol | city | Chungnam | Korea, Republic of (South) | 36.77 | 127.16 | 295 | 79356 |
| Oriul | city | Chungnam | Korea, Republic of (South) | 36.53 | 126.85 | 367 | 8560 |
| Oriul | city | Chungnam | Korea, Republic of (South) | 36.34 | 126.80 | 239 | 8491 |
| Oromosi | city | Chungnam | Korea, Republic of (South) | 36.73 | 126.81 | 16 | 43649 |
| Orumsil | city | Chungnam | Korea, Republic of (South) | 36.50 | 126.97 | 830 | 7301 |
| Oryong | city | Chungnam | Korea, Republic of (South) | 36.11 | 127.45 | 830 | 13726 |
| Oryong | city | Chungnam | Korea, Republic of (South) | 36.45 | 127.24 | 173 | 8459 |
| Oryong-dong | city | Chungnam | Korea, Republic of (South) | 36.81 | 126.86 | 45 | 16110 |
| Oryong-gol | city | Chungnam | Korea, Republic of (South) | 36.45 | 126.88 | 892 | 7700 |
| Oryong-gol | city | Chungnam | Korea, Republic of (South) | 36.91 | 126.97 | 13 | 16569 |
| Oryong-gol | city | Chungnam | Korea, Republic of (South) | 36.35 | 127.01 | 196 | 7518 |
| Oryong-ni | city | Chungnam | Korea, Republic of (South) | 36.45 | 126.88 | 892 | 7700 |
| Oryong-ni | city | Chungnam | Korea, Republic of (South) | 36.81 | 126.86 | 45 | 16110 |
| Oryong-ni | city | Chungnam | Korea, Republic of (South) | 36.94 | 127.12 | 9 | 78460 |
| Oryong-ni | city | Chungnam | Korea, Republic of (South) | 36.41 | 127.07 | 137 | 14907 |
| Oryong-ni | city | Chungnam | Korea, Republic of (South) | 36.45 | 126.87 | 892 | 7721 |
| Oryu-dong | city | Chungnam | Korea, Republic of (South) | 36.71 | 126.22 | 127 | 6048 |
| Oryu-dong | city | Chungnam | Korea, Republic of (South) | 36.78 | 127.06 | 91 | 76434 |
| Oryu-gol | city | Chungnam | Korea, Republic of (South) | 36.47 | 126.77 | 830 | 10200 |
| Oryudong | city | Chungnam | Korea, Republic of (South) | 36.16 | 127.16 | 147 | 42044 |