| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Op'o | city | Korea, Republic of (South) | 34.70 | 128.62 | 0 | 6457 | |
| Op'o | city | Gyeongnam | Korea, Republic of (South) | 34.70 | 128.61 | 0 | 6106 |
| Op'yong | city | Gyeonggi | Korea, Republic of (South) | 37.27 | 127.07 | 236 | 471262 |
| Op'yong | city | Gangwon | Korea, Republic of (South) | 37.13 | 128.89 | 3349 | 5072 |
| Op'yong | city | Chungnam | Korea, Republic of (South) | 36.27 | 127.02 | 42 | 8842 |
| Op'yong-dong | city | Gyeongbuk | Korea, Republic of (South) | 36.06 | 128.31 | 347 | 45085 |
| Op'yong-ni | city | Gyeongbuk | Korea, Republic of (South) | 36.05 | 128.38 | 111 | 72400 |
| Opcha-dong | city | Jeonnam | Korea, Republic of (South) | 34.63 | 126.51 | 75 | 3911 |
| Oppae | city | Chungnam | Korea, Republic of (South) | 36.26 | 126.94 | 16 | 33936 |
| Oppak-kol | city | Chungnam | Korea, Republic of (South) | 36.68 | 126.39 | 114 | 6669 |
| Oppak-kol | city | Gangwon | Korea, Republic of (South) | 37.55 | 128.27 | 2509 | 453 |
| Oppak-kol | city | Gangwon | Korea, Republic of (South) | 37.66 | 128.83 | 1082 | 16924 |
| Oppak-kol | city | Gyeongbuk | Korea, Republic of (South) | 36.24 | 129.17 | 1669 | 11000 |
| Oppat | city | Gyeongbuk | Korea, Republic of (South) | 36.00 | 128.52 | 1099 | 23925 |
| Oppat | city | Gyeongbuk | Korea, Republic of (South) | 35.76 | 129.01 | 830 | 8239 |
| Oppat'chae | city | Jeonnam | Korea, Republic of (South) | 34.98 | 127.15 | 370 | 8426 |
| Oppat’chae | city | Jeonnam | Korea, Republic of (South) | 34.98 | 127.15 | 370 | 8426 |
| Oppau | city | Chungbuk | Korea, Republic of (South) | 37.20 | 127.74 | 150 | 11451 |
| Oppawi | city | Gangwon | Korea, Republic of (South) | 37.40 | 129.10 | 190 | 11329 |
| Opsong-dong | city | Chungnam | Korea, Republic of (South) | 36.85 | 127.14 | 111 | 91831 |
| Optong | city | Korea, Republic of (South) | 34.97 | 127.50 | 830 | 84738 | |
| Optong-ni | city | Korea, Republic of (South) | 34.97 | 127.50 | 830 | 84738 | |
| Opyeong | city | Gyeonggi | Korea, Republic of (South) | 37.27 | 127.07 | 236 | 471262 |
| Opyeong | city | Gangwon | Korea, Republic of (South) | 38.45 | 128.44 | 26 | 9017 |
| Op’o | city | Korea, Republic of (South) | 34.70 | 128.62 | 0 | 6457 | |
| Op’o | city | Gyeongnam | Korea, Republic of (South) | 34.70 | 128.61 | 0 | 6106 |
| Op’yŏng | city | Gyeonggi | Korea, Republic of (South) | 37.27 | 127.07 | 236 | 471262 |
| Op’yŏng | city | Chungnam | Korea, Republic of (South) | 36.27 | 127.02 | 42 | 8842 |
| Op’yŏng-dong | city | Gyeongbuk | Korea, Republic of (South) | 36.06 | 128.31 | 347 | 45085 |
| Op’yŏng-ni | city | Gyeongbuk | Korea, Republic of (South) | 36.05 | 128.38 | 111 | 72400 |