| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onsang | city | Incheon | Korea, Republic of (South) | 37.64 | 126.49 | 78 | 14067 |
| Onsekiho | city | Korea, Republic of (South) | 34.88 | 127.73 | 0 | 19146 | |
| Onsen-ri | city | Chungbuk | Korea, Republic of (South) | 36.85 | 127.98 | 830 | 7862 |
| Onsen-ri | city | Chungnam | Korea, Republic of (South) | 36.78 | 127.02 | 39 | 75247 |
| Onsu | city | Chungnam | Korea, Republic of (South) | 36.30 | 126.74 | 305 | 9549 |
| Onsu | city | Jeonnam | Korea, Republic of (South) | 34.65 | 126.30 | 16 | 6371 |
| Onsu-dong | city | Seoul | Korea, Republic of (South) | 37.67 | 127.06 | 154 | 1114061 |
| Onsu-dong | city | Jeonbuk | Korea, Republic of (South) | 35.93 | 127.07 | 49 | 78370 |
| Onsu-gol | city | Gyeongnam | Korea, Republic of (South) | 35.12 | 128.44 | 154 | 112689 |
| Onsu-ri | city | Gyeongnam | Korea, Republic of (South) | 35.12 | 128.44 | 154 | 112689 |
| Onsu-ri | city | Incheon | Korea, Republic of (South) | 37.64 | 126.49 | 78 | 10473 |
| Onsu-ri | city | Chungnam | Korea, Republic of (South) | 36.30 | 126.74 | 305 | 9549 |
| Onsu-ri | city | Jeonnam | Korea, Republic of (South) | 34.65 | 126.30 | 16 | 6371 |
| Onsu-ri | city | Jeonnam | Korea, Republic of (South) | 35.14 | 127.24 | 180 | 8420 |
| Onsudong | city | Jeonnam | Korea, Republic of (South) | 34.74 | 127.09 | 830 | 5948 |
| Onsudong | city | Chungbuk | Korea, Republic of (South) | 36.95 | 127.42 | 314 | 10134 |
| Onsudong | city | Seoul | Korea, Republic of (South) | 37.50 | 126.82 | 127 | 1421568 |
| Onsudong | city | Jeonnam | Korea, Republic of (South) | 34.97 | 126.68 | 49 | 27428 |
| Onsugoeul | city | Chungbuk | Korea, Republic of (South) | 36.98 | 127.85 | 830 | 32936 |
| Onsugok | city | Incheon | Korea, Republic of (South) | 37.64 | 126.49 | 78 | 10473 |
| Onsui | city | Incheon | Korea, Republic of (South) | 37.64 | 126.49 | 78 | 10473 |
| Onsuiri | city | Incheon | Korea, Republic of (South) | 37.64 | 126.49 | 78 | 10473 |
| Onsŏk-ri | city | Gyeonggi | Korea, Republic of (South) | 37.17 | 126.85 | 59 | 7548 |
| Onsŏk-tong | city | Chungnam | Korea, Republic of (South) | 36.80 | 126.47 | 42 | 51129 |