| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O-ch'on | city | Chungbuk | Korea, Republic of (South) | 36.12 | 127.88 | 1033 | 4321 |
| Oam-ni | city | Chungbuk | Korea, Republic of (South) | 36.48 | 127.75 | 830 | 7748 |
| Oani | city | Chungbuk | Korea, Republic of (South) | 37.05 | 127.75 | 830 | 6953 |
| Obu-dong | city | Chungbuk | Korea, Republic of (South) | 36.43 | 127.54 | 170 | 46244 |
| Och'ang-ni | city | Chungbuk | Korea, Republic of (South) | 36.49 | 127.77 | 830 | 7748 |
| Och'ol-li | city | Chungbuk | Korea, Republic of (South) | 36.40 | 127.77 | 830 | 7846 |
| Och'ol-li | city | Chungbuk | Korea, Republic of (South) | 36.15 | 127.97 | 1669 | 4362 |
| Ochanggol | city | Chungbuk | Korea, Republic of (South) | 37.05 | 128.52 | 1256 | 3949 |
| Och’ang-ni | city | Chungbuk | Korea, Republic of (South) | 36.49 | 127.77 | 830 | 7748 |
| Och’ŏl-li | city | Chungbuk | Korea, Republic of (South) | 36.40 | 127.77 | 830 | 7846 |
| Odae | city | Chungbuk | Korea, Republic of (South) | 36.53 | 127.37 | 252 | 60843 |
| Odae-ri | city | Chungbuk | Korea, Republic of (South) | 36.58 | 127.73 | 885 | 8910 |
| Odong-ni | city | Chungbuk | Korea, Republic of (South) | 36.52 | 127.59 | 830 | 8120 |
| Odong-ni | city | Chungbuk | Korea, Republic of (South) | 36.40 | 127.70 | 830 | 7965 |
| Odong-ri | city | Chungbuk | Korea, Republic of (South) | 36.52 | 127.59 | 830 | 8120 |
| Odujae | city | Chungbuk | Korea, Republic of (South) | 37.22 | 127.94 | 1689 | 13827 |
| Oe-dong | city | Chungbuk | Korea, Republic of (South) | 36.80 | 127.75 | 830 | 12358 |
| Oe-kongsu-dong | city | Chungbuk | Korea, Republic of (South) | 36.12 | 127.76 | 1000 | 10377 |
| Oech'ol-li | city | Chungbuk | Korea, Republic of (South) | 36.54 | 127.42 | 830 | 67229 |
| Oech'onma-dong | city | Chungbuk | Korea, Republic of (South) | 36.10 | 127.79 | 1197 | 4321 |
| Oech’ŏl-li | city | Chungbuk | Korea, Republic of (South) | 36.54 | 127.42 | 830 | 67229 |
| Oech’ŏnma-dong | city | Chungbuk | Korea, Republic of (South) | 36.10 | 127.79 | 1197 | 4321 |
| Oedogok | city | Chungbuk | Korea, Republic of (South) | 36.37 | 127.74 | 830 | 8071 |
| Oegeomusil | city | Chungbuk | Korea, Republic of (South) | 37.07 | 128.54 | 1669 | 3276 |
| Oego | city | Chungbuk | Korea, Republic of (South) | 36.66 | 127.76 | 830 | 11997 |
| Oegol | city | Chungbuk | Korea, Republic of (South) | 36.96 | 127.86 | 223 | 49394 |
| Oegongsu-dong | city | Chungbuk | Korea, Republic of (South) | 36.12 | 127.76 | 1000 | 10377 |
| Oeham | city | Chungbuk | Korea, Republic of (South) | 36.15 | 127.78 | 830 | 27622 |
| Oeham-ni | city | Chungbuk | Korea, Republic of (South) | 36.52 | 127.72 | 830 | 7757 |
| Oehuyeong | city | Chungbuk | Korea, Republic of (South) | 36.69 | 127.80 | 830 | 12285 |
| Oejae | city | Chungbuk | Korea, Republic of (South) | 37.07 | 127.64 | 830 | 14819 |
| Oejŏ | city | Chungbuk | Korea, Republic of (South) | 36.29 | 127.72 | 830 | 8269 |
| Oemang | city | Chungbuk | Korea, Republic of (South) | 36.39 | 127.74 | 830 | 7947 |
| Oemap'o | city | Chungbuk | Korea, Republic of (South) | 36.13 | 127.70 | 830 | 4913 |
| Oemap’o | city | Chungbuk | Korea, Republic of (South) | 36.13 | 127.70 | 830 | 4913 |
| Oeodong | city | Chungbuk | Korea, Republic of (South) | 36.17 | 127.95 | 830 | 4331 |
| Oeogok | city | Chungbuk | Korea, Republic of (South) | 36.17 | 127.95 | 830 | 4331 |
| Oeogol | city | Chungbuk | Korea, Republic of (South) | 36.17 | 127.95 | 830 | 4331 |
| Oepyeong | city | Chungbuk | Korea, Republic of (South) | 36.70 | 127.48 | 164 | 64930 |
| Oeryong | city | Chungbuk | Korea, Republic of (South) | 36.77 | 127.61 | 262 | 12669 |
| Oesaeng | city | Chungbuk | Korea, Republic of (South) | 36.97 | 127.50 | 291 | 16245 |
| Oesanmak | city | Chungbuk | Korea, Republic of (South) | 36.70 | 127.76 | 830 | 12238 |
| Oesongsu-dong | city | Chungbuk | Korea, Republic of (South) | 36.12 | 127.76 | 1000 | 10377 |
| Oessanggok | city | Chungbuk | Korea, Republic of (South) | 36.78 | 127.89 | 830 | 12218 |
| Oesu | city | Chungbuk | Korea, Republic of (South) | 36.72 | 127.53 | 180 | 49383 |
| Oettanmal | city | Chungbuk | Korea, Republic of (South) | 36.57 | 127.39 | 232 | 59371 |
| Oettant'o | city | Chungbuk | Korea, Republic of (South) | 37.06 | 127.66 | 830 | 15139 |
| Oettanteo | city | Chungbuk | Korea, Republic of (South) | 37.06 | 127.66 | 830 | 15139 |
| Oettant’ŏ | city | Chungbuk | Korea, Republic of (South) | 37.06 | 127.66 | 830 | 15139 |
| Oga-ri | city | Chungbuk | Korea, Republic of (South) | 36.82 | 127.95 | 944 | 10215 |
| Oga-ri | city | Chungbuk | Korea, Republic of (South) | 36.48 | 127.47 | 88 | 96282 |
| Ogeuni | city | Chungbuk | Korea, Republic of (South) | 37.10 | 127.65 | 830 | 12637 |
| Ogodae | city | Chungbuk | Korea, Republic of (South) | 36.75 | 127.57 | 226 | 24846 |
| Ogok | city | Chungbuk | Korea, Republic of (South) | 36.20 | 127.73 | 830 | 12911 |
| Ogŭni | city | Chungbuk | Korea, Republic of (South) | 37.10 | 127.65 | 830 | 12637 |
| Ohyanggol | city | Chungbuk | Korea, Republic of (South) | 36.95 | 127.58 | 948 | 17582 |
| Ohyanggol | city | Chungbuk | Korea, Republic of (South) | 36.77 | 127.84 | 410 | 12218 |
| Ojeong | city | Chungbuk | Korea, Republic of (South) | 36.46 | 127.66 | 830 | 7760 |
| Ojŏng-gol | city | Chungbuk | Korea, Republic of (South) | 36.15 | 127.67 | 830 | 4321 |
| Ojŏng-ni | city | Chungbuk | Korea, Republic of (South) | 36.19 | 127.77 | 830 | 26515 |
| Okch'on | city | Chungbuk | Korea, Republic of (South) | 36.30 | 127.57 | 295 | 30774 |
| Okcheon | city | Chungbuk | Korea, Republic of (South) | 36.66 | 127.39 | 59 | 82002 |
| Okchon-ni | city | Chungbuk | Korea, Republic of (South) | 37.17 | 128.10 | 846 | 17651 |
| Okchŏl-li | city | Chungbuk | Korea, Republic of (South) | 37.17 | 128.10 | 846 | 17651 |
| Okchŏl-li | city | Chungbuk | Korea, Republic of (South) | 36.18 | 127.96 | 1669 | 4330 |
| Okchŏn | city | Chungbuk | Korea, Republic of (South) | 36.19 | 127.94 | 830 | 4405 |
| Okch’ŏn | city | Chungbuk | Korea, Republic of (South) | 36.30 | 127.57 | 295 | 30774 |
| Okgak | city | Chungbuk | Korea, Republic of (South) | 36.32 | 127.56 | 301 | 67873 |
| Okgangjeong | city | Chungbuk | Korea, Republic of (South) | 37.04 | 127.86 | 242 | 28694 |
| Okgye | city | Chungbuk | Korea, Republic of (South) | 36.74 | 127.57 | 344 | 22417 |
| Okgyegol | city | Chungbuk | Korea, Republic of (South) | 36.63 | 127.71 | 830 | 9530 |
| Okho | city | Chungbuk | Korea, Republic of (South) | 36.60 | 127.68 | 830 | 8261 |
| Okhyon-ni | city | Chungbuk | Korea, Republic of (South) | 36.87 | 127.70 | 948 | 16439 |
| Okjeolli | city | Chungbuk | Korea, Republic of (South) | 37.17 | 128.10 | 846 | 17651 |
| Okkangjŏng | city | Chungbuk | Korea, Republic of (South) | 37.04 | 127.86 | 242 | 28694 |
| Okkil-tong | city | Chungbuk | Korea, Republic of (South) | 36.21 | 127.69 | 370 | 5636 |
| Okkye-ri | city | Chungbuk | Korea, Republic of (South) | 36.63 | 127.28 | 68 | 63016 |
| Okpak-kol | city | Chungbuk | Korea, Republic of (South) | 36.33 | 127.68 | 830 | 8883 |
| Oksan-ni | city | Chungbuk | Korea, Republic of (South) | 36.78 | 127.45 | 357 | 10139 |
| Oksani | city | Chungbuk | Korea, Republic of (South) | 36.77 | 127.56 | 226 | 18311 |
| Oksumok | city | Chungbuk | Korea, Republic of (South) | 37.07 | 128.48 | 830 | 3529 |
| Oksŏng | city | Chungbuk | Korea, Republic of (South) | 37.13 | 127.91 | 830 | 9530 |
| Oksŏng-ni | city | Chungbuk | Korea, Republic of (South) | 36.78 | 127.44 | 301 | 11891 |
| Olmok | city | Chungbuk | Korea, Republic of (South) | 36.28 | 127.65 | 830 | 11469 |
| Olsan-ni | city | Chungbuk | Korea, Republic of (South) | 36.83 | 128.37 | 2509 | 5179 |
| Omi | city | Chungbuk | Korea, Republic of (South) | 36.65 | 127.67 | 951 | 8769 |
| Omi-ri | city | Chungbuk | Korea, Republic of (South) | 37.24 | 128.19 | 1669 | 10496 |
| Omjang-gol | city | Chungbuk | Korea, Republic of (South) | 37.08 | 127.64 | 387 | 14542 |
| Omogi | city | Chungbuk | Korea, Republic of (South) | 36.96 | 127.50 | 291 | 16554 |
| Omokchom | city | Chungbuk | Korea, Republic of (South) | 36.82 | 128.32 | 1758 | 4966 |
| Omongnae | city | Chungbuk | Korea, Republic of (South) | 36.82 | 128.32 | 1669 | 4966 |
| On'gimi | city | Chungbuk | Korea, Republic of (South) | 37.08 | 127.94 | 314 | 24554 |
| Onae | city | Chungbuk | Korea, Republic of (South) | 36.25 | 127.78 | 370 | 8279 |
| Onam | city | Chungbuk | Korea, Republic of (South) | 36.69 | 127.47 | 144 | 66272 |
| Onch'on-ni | city | Chungbuk | Korea, Republic of (South) | 36.85 | 127.98 | 830 | 7862 |
| Onch’ŏn-ni | city | Chungbuk | Korea, Republic of (South) | 36.85 | 127.98 | 830 | 7862 |
| Ongdaengi | city | Chungbuk | Korea, Republic of (South) | 37.17 | 128.17 | 964 | 39858 |
| Ongimi | city | Chungbuk | Korea, Republic of (South) | 37.08 | 127.94 | 314 | 24554 |
| Ongnuk-ch'on | city | Chungbuk | Korea, Republic of (South) | 36.16 | 127.95 | 984 | 4334 |
| Ongnŭk-ch’on | city | Chungbuk | Korea, Republic of (South) | 36.16 | 127.95 | 984 | 4334 |
| Onnamu-gol | city | Chungbuk | Korea, Republic of (South) | 37.12 | 127.85 | 830 | 9406 |
| Onsen-ri | city | Chungbuk | Korea, Republic of (South) | 36.85 | 127.98 | 830 | 7862 |
| Onsudong | city | Chungbuk | Korea, Republic of (South) | 36.95 | 127.42 | 314 | 10134 |
| Onsugoeul | city | Chungbuk | Korea, Republic of (South) | 36.98 | 127.85 | 830 | 32936 |
| Onyangt'o | city | Chungbuk | Korea, Republic of (South) | 37.05 | 127.47 | 830 | 9907 |
| Onyangteo | city | Chungbuk | Korea, Republic of (South) | 37.05 | 127.47 | 830 | 9907 |
| Onyangt’ŏ | city | Chungbuk | Korea, Republic of (South) | 37.05 | 127.47 | 830 | 9907 |
| On’gimi | city | Chungbuk | Korea, Republic of (South) | 37.08 | 127.94 | 314 | 24554 |
| Oppau | city | Chungbuk | Korea, Republic of (South) | 37.20 | 127.74 | 150 | 11451 |
| Orang-ni | city | Chungbuk | Korea, Republic of (South) | 37.11 | 127.86 | 938 | 8616 |
| Ori-gol | city | Chungbuk | Korea, Republic of (South) | 37.11 | 128.12 | 869 | 19456 |
| Origol | city | Chungbuk | Korea, Republic of (South) | 37.06 | 128.61 | 1669 | 3586 |
| Origol | city | Chungbuk | Korea, Republic of (South) | 36.70 | 127.45 | 75 | 53203 |
| Origol | city | Chungbuk | Korea, Republic of (South) | 36.70 | 127.53 | 295 | 72034 |
| Orim | city | Chungbuk | Korea, Republic of (South) | 36.97 | 127.95 | 374 | 89622 |
| Orim | city | Chungbuk | Korea, Republic of (South) | 36.46 | 127.80 | 830 | 7748 |
| Orimok | city | Chungbuk | Korea, Republic of (South) | 36.74 | 127.67 | 1669 | 12053 |
| Orinaegol | city | Chungbuk | Korea, Republic of (South) | 37.07 | 128.28 | 830 | 9924 |
| Orinamugol | city | Chungbuk | Korea, Republic of (South) | 36.70 | 127.37 | 360 | 48081 |
| Orisil | city | Chungbuk | Korea, Republic of (South) | 37.06 | 128.10 | 830 | 9308 |
| Orisil | city | Chungbuk | Korea, Republic of (South) | 36.18 | 127.94 | 830 | 4323 |
| Oryong | city | Chungbuk | Korea, Republic of (South) | 37.00 | 127.65 | 830 | 16090 |
| Oryong | city | Chungbuk | Korea, Republic of (South) | 36.60 | 127.37 | 167 | 88443 |
| Oryong-dong | city | Chungbuk | Korea, Republic of (South) | 36.50 | 127.52 | 830 | 19838 |
| Oryong-gol | city | Chungbuk | Korea, Republic of (South) | 36.47 | 127.74 | 830 | 7748 |
| Oryong-gol | city | Chungbuk | Korea, Republic of (South) | 36.23 | 127.68 | 331 | 6447 |
| Oryonggae | city | Chungbuk | Korea, Republic of (South) | 36.53 | 127.36 | 36 | 53558 |
| Oryonggol | city | Chungbuk | Korea, Republic of (South) | 36.98 | 127.59 | 830 | 17571 |
| Oryu | city | Chungbuk | Korea, Republic of (South) | 36.33 | 127.61 | 236 | 19997 |
| Oryugol | city | Chungbuk | Korea, Republic of (South) | 36.98 | 127.47 | 229 | 13801 |
| Osa | city | Chungbuk | Korea, Republic of (South) | 37.10 | 128.51 | 830 | 1982 |
| Osa-ri | city | Chungbuk | Korea, Republic of (South) | 37.10 | 128.50 | 830 | 2261 |
| Osang-ni | city | Chungbuk | Korea, Republic of (South) | 36.99 | 127.47 | 246 | 13521 |
| Osangch'on | city | Chungbuk | Korea, Republic of (South) | 37.10 | 128.35 | 1190 | 3918 |
| Osi-ri | city | Chungbuk | Korea, Republic of (South) | 37.10 | 128.50 | 830 | 2261 |
| Osil | city | Chungbuk | Korea, Republic of (South) | 36.20 | 127.73 | 830 | 12911 |
| Osim-ni | city | Chungbuk | Korea, Republic of (South) | 36.48 | 127.77 | 830 | 7748 |
| Osimi | city | Chungbuk | Korea, Republic of (South) | 36.48 | 127.77 | 830 | 7748 |
| Osong | city | Chungbuk | Korea, Republic of (South) | 36.61 | 127.32 | 62 | 95639 |
| Osu-dong | city | Chungbuk | Korea, Republic of (South) | 36.78 | 127.97 | 830 | 11426 |
| Osumul | city | Chungbuk | Korea, Republic of (South) | 36.78 | 127.97 | 830 | 11426 |
| Ot'al-li | city | Chungbuk | Korea, Republic of (South) | 36.20 | 127.77 | 830 | 27699 |
| Otbau | city | Chungbuk | Korea, Republic of (South) | 37.20 | 127.74 | 150 | 11451 |
| Otbawi | city | Chungbuk | Korea, Republic of (South) | 37.20 | 127.74 | 150 | 11451 |
| Otbawi | city | Chungbuk | Korea, Republic of (South) | 36.98 | 128.33 | 830 | 5066 |
| Ot’al-li | city | Chungbuk | Korea, Republic of (South) | 36.20 | 127.77 | 830 | 27699 |
| Oun | city | Chungbuk | Korea, Republic of (South) | 37.06 | 128.63 | 1669 | 3738 |
| Oyagol | city | Chungbuk | Korea, Republic of (South) | 37.05 | 127.64 | 830 | 15425 |
| Oyak-kol | city | Chungbuk | Korea, Republic of (South) | 37.05 | 127.64 | 830 | 15425 |
| Oyang-gol | city | Chungbuk | Korea, Republic of (South) | 37.13 | 127.89 | 1669 | 9992 |
| Oyangsan | city | Chungbuk | Korea, Republic of (South) | 36.93 | 127.44 | 196 | 12864 |
| Oyanmal | city | Chungbuk | Korea, Republic of (South) | 36.63 | 127.78 | 1017 | 12023 |
| Oyatgol | city | Chungbuk | Korea, Republic of (South) | 37.05 | 127.64 | 830 | 15425 |