| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| On'go | city | | Korea, Republic of (South) | 35.2833333 | 126.5 | 75 | 21361 |
| On'go-ri | city | | Korea, Republic of (South) | 35.2833333 | 126.5 | 75 | 21361 |
| On-gol | city | Kangwon-do | Korea, Republic of (South) | 38.1680556 | 127.5711111 | 2129 | 9258 |
| On-gol | city | Kyongsang-bukto | Korea, Republic of (South) | 37.0172222 | 129.4052778 | 157 | 6458 |
| On-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.7666667 | 126.8666667 | 52 | 26024 |
| Onae | city | Kyongsang-bukto | Korea, Republic of (South) | 36.7880556 | 128.7397222 | 639 | 17529 |
| Onbyol | city | Kangwon-do | Korea, Republic of (South) | 37.6922222 | 128.9291667 | 633 | 9097 |
| Onbyol-li | city | Kangwon-do | Korea, Republic of (South) | 37.6922222 | 128.9291667 | 633 | 9097 |
| Onch'ol-li | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.3858333 | 127.2588889 | 498 | 64871 |
| Onch'on il-tong | city | Pusan-gwangyoksi | Korea, Republic of (South) | 35.2166667 | 129.0833333 | 160 | 1204078 |
| Onch'on-dong | city | Cheju-do | Korea, Republic of (South) | 33.3333333 | 126.7666667 | 301 | 24734 |
| Onch'on-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6883333 | 128.7030556 | 501 | 17549 |
| Onch'on-ni | city | Cheju-do | Korea, Republic of (South) | 33.3333333 | 126.7666667 | 301 | 24734 |
| Onch'on-ni | city | Pusan-gwangyoksi | Korea, Republic of (South) | 35.2166667 | 129.0833333 | 160 | 1204078 |
| Onch'ŏl-li | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.3858333 | 127.2588889 | 498 | 64871 |
| Onch'ŏn il-tong | city | Pusan-gwangyoksi | Korea, Republic of (South) | 35.2166667 | 129.0833333 | 160 | 1204078 |
| Onch'ŏn-dong | city | Cheju-do | Korea, Republic of (South) | 33.3333333 | 126.7666667 | 301 | 24734 |
| Onch'ŏn-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6883333 | 128.7030556 | 501 | 17549 |
| Onch'ŏn-ni | city | Cheju-do | Korea, Republic of (South) | 33.3333333 | 126.7666667 | 301 | 24734 |
| Onch'ŏn-ni | city | Pusan-gwangyoksi | Korea, Republic of (South) | 35.2166667 | 129.0833333 | 160 | 1204078 |
| Onchong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6883333 | 128.7030556 | 501 | 17549 |
| Ondang-ni | city | Cholla-namdo | Korea, Republic of (South) | 35.2808333 | 127.4397222 | 393 | 22669 |
| Ondok | city | Cholla-namdo | Korea, Republic of (South) | 34.7166667 | 126.2833333 | 137 | 7556 |
| Ondolgae | city | | Korea, Republic of (South) | 34.8833333 | 127.7333333 | 0 | 6227 |
| Ondolp'o | city | | Korea, Republic of (South) | 34.8833333 | 127.7333333 | 0 | 6227 |
| Ondong | city | | Korea, Republic of (South) | 34.8833333 | 127.7333333 | 0 | 6227 |
| Ondong-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.7166667 | 126.2833333 | 137 | 7556 |
| Ondong-ni | city | Cholla-bukto | Korea, Republic of (South) | 35.7155556 | 126.6625 | 32 | 24135 |
| Ondong-ni | city | | Korea, Republic of (South) | 34.7666667 | 127.3333333 | 16 | 16972 |
| Ondŏk | city | Cholla-namdo | Korea, Republic of (South) | 34.7166667 | 126.2833333 | 137 | 7556 |
| Ondŏng-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.7166667 | 126.2833333 | 137 | 7556 |
| Ong-dong | city | | Korea, Republic of (South) | 35.5333333 | 126.9 | 357 | 28268 |
| Ong-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6 | 128.3666667 | 347 | 17567 |
| Ong-gol | city | Kangwon-do | Korea, Republic of (South) | 37.2097222 | 127.8761111 | 994 | 10253 |
| Ong-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.9002778 | 127.0663889 | 931 | 21333 |
| Ong-ni | city | Cholla-namdo | Korea, Republic of (South) | 35.1633333 | 127.0808333 | 623 | 27424 |
| Ongam | city | Cholla-namdo | Korea, Republic of (South) | 34.5333333 | 126.55 | 36 | 19843 |
| Ongam | city | Cholla-namdo | Korea, Republic of (South) | 34.4358333 | 126.8811111 | 0 | 11245 |
| Ongam | city | Cholla-namdo | Korea, Republic of (South) | 34.7833333 | 127.3833333 | 3 | 8707 |
| Ongam-ni | city | Inch'on-gwangyoksi | Korea, Republic of (South) | 37.5319444 | 126.3733333 | 3 | 72340 |
| Ongam-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.5333333 | 126.55 | 36 | 19843 |
| Ongam-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.4358333 | 126.8811111 | 0 | 11245 |
| Ongam-ni | city | | Korea, Republic of (South) | 34.7833333 | 127.3833333 | 3 | 8707 |
| Ongam-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.7852778 | 127.3872222 | 3 | 8707 |
| Ongch'on | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6883333 | 128.7030556 | 501 | 17549 |
| Ongch'on-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6883333 | 128.7030556 | 501 | 17549 |
| Ongch'ŏn | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6883333 | 128.7030556 | 501 | 17549 |
| Ongch'ŏn-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6883333 | 128.7030556 | 501 | 17549 |
| Ongchon-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.7166667 | 128.7 | 1056 | 17539 |
| Ongdaengi | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 37.1675 | 128.1725 | 1007 | 16403 |
| Onggijon-mal | city | Kangwon-do | Korea, Republic of (South) | 37.3458333 | 128.3755556 | 1007 | 9363 |
| Onggijŏn-mal | city | Kangwon-do | Korea, Republic of (South) | 37.3458333 | 128.3755556 | 1007 | 9363 |
| Onggima | city | Kyongsang-bukto | Korea, Republic of (South) | 36.5922222 | 128.65 | 498 | 17567 |
| Ongguma | city | Kyongsang-bukto | Korea, Republic of (South) | 36.5922222 | 128.65 | 498 | 17567 |
| Ongjom | city | Kyongsang-bukto | Korea, Republic of (South) | 36.4758333 | 129.0713889 | 954 | 17595 |
| Ongjom-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.4758333 | 129.0713889 | 954 | 17595 |
| Ongjom-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.7 | 126.5666667 | 9 | 15502 |
| Ongjom-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.8166667 | 126.6833333 | 9 | 20865 |
| Ongjong | city | Kyonggi-do | Korea, Republic of (South) | 37.0405556 | 127.0180556 | 39 | 84790 |
| Ongjong-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 35.8341667 | 128.3383333 | 170 | 17736 |
| Ongjong-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.9 | 126.8166667 | 0 | 15596 |
| Ongjong-ni | city | Cholla-bukto | Korea, Republic of (South) | 35.3586111 | 127.2997222 | 190 | 28313 |
| Ongjŏm | city | Kyongsang-bukto | Korea, Republic of (South) | 36.4758333 | 129.0713889 | 954 | 17595 |
| Ongjŏm-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.4758333 | 129.0713889 | 954 | 17595 |
| Ongjŏm-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.7 | 126.5666667 | 9 | 15502 |
| Ongjŏm-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.8166667 | 126.6833333 | 9 | 20865 |
| Ongjŏng | city | Kyonggi-do | Korea, Republic of (South) | 37.0405556 | 127.0180556 | 39 | 84790 |
| Ongjŏng-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 35.8341667 | 128.3383333 | 170 | 17736 |
| Ongjŏng-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.9 | 126.8166667 | 0 | 15596 |
| Ongjŏng-ni | city | Cholla-bukto | Korea, Republic of (South) | 35.3586111 | 127.2997222 | 190 | 28313 |
| Ongma-ri | city | Cholla-namdo | Korea, Republic of (South) | 34.8080556 | 127.0308333 | 646 | 21354 |
| Ongmyong | city | | Korea, Republic of (South) | 34.8666667 | 128.7333333 | 0 | 17404 |
| Ongmyong-ni | city | | Korea, Republic of (South) | 34.8666667 | 128.7333333 | 0 | 17404 |
| Ongmyonggol | city | | Korea, Republic of (South) | 34.8666667 | 128.7333333 | 0 | 17404 |
| Ongmyŏng | city | | Korea, Republic of (South) | 34.8666667 | 128.7333333 | 0 | 17404 |
| Ongmyŏng-ni | city | | Korea, Republic of (South) | 34.8666667 | 128.7333333 | 0 | 17404 |
| Ongmyŏnggol | city | | Korea, Republic of (South) | 34.8666667 | 128.7333333 | 0 | 17404 |
| Ongnyol-li | city | Kyongsang-bukto | Korea, Republic of (South) | 35.9133333 | 128.2277778 | 334 | 17728 |
| Ongnyong | city | Cholla-namdo | Korea, Republic of (South) | 34.4375 | 127.1277778 | 3 | 8342 |
| Ongnyong-dong | city | Kyongsang-namdo | Korea, Republic of (South) | 35.5666667 | 128.45 | 82 | 35956 |
| Ongnyong-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.4375 | 127.1277778 | 3 | 8342 |
| Ongnyŏl-li | city | Kyongsang-bukto | Korea, Republic of (South) | 35.9133333 | 128.2277778 | 334 | 17728 |
| Ongon-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 37.0172222 | 129.4052778 | 157 | 6458 |
| Ongp'o | city | Cheju-do | Korea, Republic of (South) | 33.4 | 126.25 | 65 | 24157 |
| Ongp'o | city | | Korea, Republic of (South) | 34.7333333 | 127.25 | 0 | 10818 |
| Ongp'o-ri | city | Cheju-do | Korea, Republic of (South) | 33.4 | 126.25 | 65 | 24157 |
| Onham-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.35 | 126.7833333 | 501 | 26824 |
| Onhang-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.55 | 126.0666667 | 160 | 6630 |
| 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 |
| Onhye | city | Kyongsang-bukto | Korea, Republic of (South) | 36.75 | 128.8333333 | 666 | 17539 |
| Onhye-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 36.75 | 128.8333333 | 666 | 17539 |
| Onin-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.55 | 126.55 | 118 | 19637 |
| Onjing-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.3755556 | 126.8005556 | 698 | 26810 |
| Onjong | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.7333333 | 126.4166667 | 22 | 22320 |
| Onjong-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 37.0761111 | 129.2911111 | 662 | 9398 |
| Onjong-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.7333333 | 126.4166667 | 22 | 22320 |
| Onjŏng-dong | city | Kyongsang-bukto | Korea, Republic of (South) | 37.0761111 | 129.2911111 | 662 | 9398 |
| Onmak | city | Kyongsang-bukto | Korea, Republic of (South) | 35.6436111 | 128.8380556 | 246 | 18001 |
| Onmang-ni | city | Kyongsang-bukto | Korea, Republic of (South) | 35.6436111 | 128.8380556 | 246 | 18001 |
| Onmok | city | | Korea, Republic of (South) | 35.35 | 126.45 | 314 | 20341 |
| Onnamu-gol | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6833333 | 127.9833333 | 751 | 20005 |
| Onnamu-kol | city | Kyongsang-bukto | Korea, Republic of (South) | 36.6833333 | 127.9833333 | 751 | 20005 |
| Onp'o | city | | Korea, Republic of (South) | 35.6 | 126.4833333 | 9 | 10606 |
| Onp'o | city | Kyongsang-namdo | Korea, Republic of (South) | 34.8833333 | 128.0333333 | 308 | 17671 |
| Onp'o-ni | city | Cheju-do | Korea, Republic of (South) | 33.4 | 126.25 | 65 | 24157 |
| Onp'o-ri | city | | Korea, Republic of (South) | 35.6 | 126.4833333 | 9 | 10606 |
| 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 |
| Onsekiho | city | | Korea, Republic of (South) | 34.8833333 | 127.7333333 | 0 | 6227 |
| Onsu | city | Cholla-namdo | Korea, Republic of (South) | 34.65 | 126.3 | 16 | 15152 |
| Onsu | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.3 | 126.75 | 239 | 26838 |
| Onsu-ri | city | Cholla-namdo | Korea, Republic of (South) | 34.65 | 126.3 | 16 | 15152 |
| Onsu-ri | city | Inch'on-gwangyoksi | Korea, Republic of (South) | 37.6397222 | 126.4919444 | 78 | 74635 |
| Onsu-ri | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.3 | 126.75 | 239 | 26838 |
| Onsu-ri | city | Cholla-namdo | Korea, Republic of (South) | 35.1405556 | 127.2430556 | 180 | 21267 |
| Onsu-ri | city | Kyongsang-namdo | Korea, Republic of (South) | 35.1666667 | 128.25 | 209 | 42203 |
| Onsugok | city | Inch'on-gwangyoksi | Korea, Republic of (South) | 37.6397222 | 126.4919444 | 78 | 74635 |
| Onsui | city | Inch'on-gwangyoksi | Korea, Republic of (South) | 37.6397222 | 126.4919444 | 78 | 74635 |
| Onsuiri | city | Inch'on-gwangyoksi | Korea, Republic of (South) | 37.6397222 | 126.4919444 | 78 | 74635 |
| Ont'am-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.35 | 126.7833333 | 501 | 26824 |
| Ontoruho | city | | Korea, Republic of (South) | 34.8833333 | 127.7333333 | 0 | 6227 |
| Onyang | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.7836111 | 127.041667 | 22 | 26684 |
| Onyang | city | Ulsan-gwangyoksi | Korea, Republic of (South) | 35.5588889 | 129.1202778 | 328 | 41325 |
| Onyang-dong | city | Kyonggi-do | Korea, Republic of (South) | 37.855 | 126.8791667 | 351 | 89822 |
| Onyo | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.7836111 | 127.041667 | 22 | 26684 |
| Onyoul | city | Kangwon-do | Korea, Republic of (South) | 37.2244444 | 127.8136111 | 695 | 9378 |
| Onyō | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.7836111 | 127.041667 | 22 | 26684 |
| Onyŏul | city | Kangwon-do | Korea, Republic of (South) | 37.2244444 | 127.8136111 | 695 | 9378 |