| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onsa-ri | city | Korea, Dem. Peoples Rep. of (North) | 40.18 | 126.43 | 1154 | 3580 | |
| Onsan | city | Kangwon | Korea, Dem. Peoples Rep. of (North) | 39.15 | 127.44 | 45 | 165173 |
| Onsang-dong | city | P'yongbuk | Korea, Dem. Peoples Rep. of (North) | 40.25 | 125.19 | 902 | 4578 |
| Onsang-ni | city | P'yongnam | Korea, Dem. Peoples Rep. of (North) | 39.49 | 125.69 | 830 | 36182 |
| Onsangch'am | city | Chagang | Korea, Dem. Peoples Rep. of (North) | 40.19 | 126.68 | 2509 | 3278 |
| Onsangch’am | city | Chagang | Korea, Dem. Peoples Rep. of (North) | 40.19 | 126.68 | 2509 | 3278 |
| Onsei | city | P'yongbuk | Korea, Dem. Peoples Rep. of (North) | 40.11 | 125.90 | 318 | 19586 |
| Onsei-ri | city | Hwangnam | Korea, Dem. Peoples Rep. of (North) | 38.57 | 125.43 | 95 | 21755 |
| Onsei-ri | city | Hwangnam | Korea, Dem. Peoples Rep. of (North) | 38.12 | 126.20 | 180 | 19953 |
| Onsei-ri | city | P'yongnam | Korea, Dem. Peoples Rep. of (North) | 39.20 | 126.83 | 1099 | 8321 |
| Onsei-ri | city | Kangwon | Korea, Dem. Peoples Rep. of (North) | 38.69 | 128.21 | 62 | 10687 |
| Onsei-ri | city | P'yongnam | Korea, Dem. Peoples Rep. of (North) | 38.88 | 125.23 | 29 | 46338 |
| Onsen-do | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 42.00 | 129.31 | 2913 | 7450 |
| Onsen-ri | city | Hwangnam | Korea, Dem. Peoples Rep. of (North) | 38.21 | 125.42 | 259 | 24451 |
| Onsen-ri | city | P'yongnam | Korea, Dem. Peoples Rep. of (North) | 38.88 | 125.22 | 42 | 46333 |
| Onsin-dong | city | Hwangnam | Korea, Dem. Peoples Rep. of (North) | 38.01 | 126.75 | 200 | 14275 |
| Onso-gol | city | P'yongnam | Korea, Dem. Peoples Rep. of (North) | 39.42 | 126.61 | 944 | 7109 |
| Onsong | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 42.96 | 129.99 | 275 | 14797 |
| Onsong-up | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 42.95 | 129.86 | 406 | 18870 |
| Onsu-ri | city | Hwangnam | Korea, Dem. Peoples Rep. of (North) | 38.31 | 125.17 | 170 | 22669 |
| Onsuch'am | city | Chagang | Korea, Dem. Peoples Rep. of (North) | 40.21 | 126.52 | 1833 | 3278 |
| Onsuch’am | city | Chagang | Korea, Dem. Peoples Rep. of (North) | 40.21 | 126.52 | 1833 | 3278 |
| Onsui-ri | city | Hwangnam | Korea, Dem. Peoples Rep. of (North) | 38.31 | 125.17 | 170 | 22669 |
| Onsup'yong | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 41.12 | 129.69 | 351 | 8267 |
| Onsup'yong | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 41.00 | 129.22 | 1669 | 11622 |
| Onsup'yong | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 41.06 | 129.37 | 1092 | 9576 |
| Onsup'yong-ch'on | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 41.00 | 129.22 | 1669 | 11622 |
| Onsup’yŏng | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 41.12 | 129.69 | 351 | 8267 |
| Onsup’yŏng | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 41.00 | 129.22 | 1669 | 11622 |
| Onsup’yŏng | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 41.06 | 129.37 | 1092 | 9576 |
| Onsup’yŏng-ch’on | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 41.00 | 129.22 | 1669 | 11622 |
| Onsŏng | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 42.95 | 129.86 | 406 | 18870 |
| Onsŏng-ŭp | city | Hambuk | Korea, Dem. Peoples Rep. of (North) | 42.96 | 129.99 | 275 | 14797 |