| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Obong-ni | city | Jeju | Korea, Republic of (South) | 33.52 | 126.95 | 42 | 888 |
| Odo-dong | city | Jeju | Korea, Republic of (South) | 33.49 | 126.46 | 141 | 76502 |
| Odo-ni | city | Jeju | Korea, Republic of (South) | 33.42 | 126.32 | 390 | 15079 |
| Odo-ri | city | Jeju | Korea, Republic of (South) | 33.42 | 126.32 | 390 | 15079 |
| Odoburak | city | Jeju | Korea, Republic of (South) | 33.49 | 126.46 | 141 | 76502 |
| Odu-dong | city | Jeju | Korea, Republic of (South) | 33.25 | 126.44 | 180 | 21531 |
| Odung | city | Jeju | Korea, Republic of (South) | 33.47 | 126.53 | 830 | 132080 |
| Odung-ni | city | Jeju | Korea, Republic of (South) | 33.46 | 126.53 | 908 | 138908 |
| Odŭng-dong | city | Jeju | Korea, Republic of (South) | 33.46 | 126.53 | 908 | 138908 |
| Oedo-dong | city | Jeju | Korea, Republic of (South) | 33.49 | 126.44 | 52 | 52326 |
| Ojo-ri | city | Jeju | Korea, Republic of (South) | 33.46 | 126.92 | 3 | 6928 |
| Ojori | city | Jeju | Korea, Republic of (South) | 33.46 | 126.92 | 3 | 6928 |
| Ojyo-ri | city | Jeju | Korea, Republic of (South) | 33.46 | 126.92 | 3 | 6928 |
| Onch'on-dong | city | Jeju | Korea, Republic of (South) | 33.33 | 126.77 | 301 | 10344 |
| Onch'on-ni | city | Jeju | Korea, Republic of (South) | 33.33 | 126.77 | 301 | 10344 |
| Onch’ŏn-dong | city | Jeju | Korea, Republic of (South) | 33.33 | 126.77 | 301 | 10344 |
| Onch’ŏn-ni | city | Jeju | Korea, Republic of (South) | 33.33 | 126.77 | 301 | 10344 |
| Onhei | city | Jeju | Korea, Republic of (South) | 33.41 | 126.90 | 3 | 5973 |
| Onhei-ri | city | Jeju | Korea, Republic of (South) | 33.41 | 126.90 | 3 | 5973 |
| Onp'yong | city | Jeju | Korea, Republic of (South) | 33.41 | 126.90 | 3 | 5973 |
| Onp'yong-ni | city | Jeju | Korea, Republic of (South) | 33.41 | 126.90 | 3 | 5973 |
| Onp’yŏng | city | Jeju | Korea, Republic of (South) | 33.41 | 126.90 | 3 | 5973 |
| Onp’yŏng-ni | city | Jeju | Korea, Republic of (South) | 33.41 | 126.90 | 3 | 5973 |
| Ora-dong | city | Jeju | Korea, Republic of (South) | 33.48 | 126.51 | 830 | 117383 |
| Oreumdong | city | Jeju | Korea, Republic of (South) | 33.45 | 126.34 | 360 | 11419 |
| Orumsakki-dong | city | Jeju | Korea, Republic of (South) | 33.48 | 126.75 | 830 | 17001 |
| Oso-ri | city | Jeju | Korea, Republic of (South) | 33.46 | 126.92 | 3 | 6928 |