| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Odo-dong | city | Cheju-do | Korea, Republic of (South) | 33.4833333 | 126.4666667 | 275 | 25492 |
| Odo-ni | city | Cheju-do | Korea, Republic of (South) | 33.4166667 | 126.3166667 | 390 | 21409 |
| Odo-ri | city | Cheju-do | Korea, Republic of (South) | 33.4166667 | 126.3166667 | 390 | 21409 |
| Oedo-dong | city | Cheju-do | Korea, Republic of (South) | 33.4905556 | 126.4322222 | 59 | 21912 |
| Ojo-ri | city | Cheju-do | Korea, Republic of (South) | 33.4508333 | 126.9166667 | 22 | 10841 |
| Ojyo-ri | city | Cheju-do | Korea, Republic of (South) | 33.4508333 | 126.9166667 | 22 | 10841 |
| Omsu | city | Cheju-do | Korea, Republic of (South) | 33.3666667 | 126.2 | 65 | 15193 |
| Onch'on-dong | city | Cheju-do | Korea, Republic of (South) | 33.3333333 | 126.7666667 | 301 | 24734 |
| Onch'on-ni | city | Cheju-do | Korea, Republic of (South) | 33.3333333 | 126.7666667 | 301 | 24734 |
| Onch'ŏn-dong | city | Cheju-do | Korea, Republic of (South) | 33.3333333 | 126.7666667 | 301 | 24734 |
| Onch'ŏn-ni | city | Cheju-do | Korea, Republic of (South) | 33.3333333 | 126.7666667 | 301 | 24734 |
| Ongp'o | city | Cheju-do | Korea, Republic of (South) | 33.4 | 126.25 | 65 | 24157 |
| Ongp'o-ri | city | Cheju-do | Korea, Republic of (South) | 33.4 | 126.25 | 65 | 24157 |
| Onhei | city | Cheju-do | Korea, Republic of (South) | 33.4072222 | 126.9005556 | 3 | 18193 |
| Onhei-ri | city | Cheju-do | Korea, Republic of (South) | 33.4072222 | 126.9005556 | 3 | 18193 |
| Onp'o-ni | city | Cheju-do | Korea, Republic of (South) | 33.4 | 126.25 | 65 | 24157 |
| Onp'yong | city | Cheju-do | Korea, Republic of (South) | 33.4072222 | 126.9005556 | 3 | 18193 |
| Onp'yong-ni | city | Cheju-do | Korea, Republic of (South) | 33.4072222 | 126.9005556 | 3 | 18193 |
| Onp'yŏng | city | Cheju-do | Korea, Republic of (South) | 33.4072222 | 126.9005556 | 3 | 18193 |
| Onp'yŏng-ni | city | Cheju-do | Korea, Republic of (South) | 33.4072222 | 126.9005556 | 3 | 18193 |
| Orumbi | city | Cheju-do | Korea, Republic of (South) | 33.4005556 | 126.3294444 | 734 | 31585 |
| Orumsaekki-dong | city | Cheju-do | Korea, Republic of (South) | 33.4833333 | 126.75 | 698 | 34169 |
| Orumsakki-dong | city | Cheju-do | Korea, Republic of (South) | 33.4833333 | 126.75 | 698 | 34169 |
| Orŭmsakki-dong | city | Cheju-do | Korea, Republic of (South) | 33.4833333 | 126.75 | 698 | 34169 |
| Oso-ri | city | Cheju-do | Korea, Republic of (South) | 33.4508333 | 126.9166667 | 22 | 10841 |
| Oum-ni | city | Cheju-do | Korea, Republic of (South) | 33.4191667 | 126.3316667 | 570 | 21409 |