| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Osa | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.55 | 126.4669444 | 26 | 12774 |
| Osa | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.95 | 126.75 | 32 | 18504 |
| Osa | city | Kyongsang-bukto | Korea, Republic of (South) | 35.7147222 | 128.3711111 | 104 | 17764 |
| Osa-ri | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.55 | 126.4669444 | 26 | 12774 |
| Osa-ri | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.95 | 126.75 | 32 | 18504 |
| Osa-ri | city | Kyongsang-bukto | Korea, Republic of (South) | 35.7147222 | 128.3711111 | 104 | 17764 |
| Osal-li | city | Cholla-namdo | Korea, Republic of (South) | 34.4908333 | 126.3441667 | 98 | 12795 |
| Osal-li | city | Cholla-namdo | Korea, Republic of (South) | 34.415 | 126.6427778 | 3 | 15795 |
| Osal-li | city | Cholla-namdo | Korea, Republic of (South) | 34.62 | 126.9 | 95 | 21407 |
| Osal-li | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.3880556 | 126.9636111 | 236 | 26810 |
| Osal-li | city | Cholla-namdo | Korea, Republic of (South) | 35.0769444 | 127.2908333 | 518 | 21288 |
| Osal-li | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.6602778 | 127.3777778 | 55 | 22184 |
| Osal-li | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.9677778 | 127.485 | 226 | 42668 |
| Osal-li | city | Kangwon-do | Korea, Republic of (South) | 37.5247222 | 127.985 | 479 | 9342 |
| Osal-li | city | Kyongsang-namdo | Korea, Republic of (South) | 35.030556 | 128.1861111 | 528 | 42287 |
| Osal-li | city | Kyongsang-bukto | Korea, Republic of (South) | 35.7197222 | 128.5622222 | 1095 | 49694 |
| Osal-li | city | Kangwon-do | Korea, Republic of (South) | 38.0766667 | 128.6708333 | 147 | 4254 |
| Osalmoe | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.3880556 | 126.9636111 | 236 | 26810 |
| Osan | city | Cholla-namdo | Korea, Republic of (South) | 34.4908333 | 126.3441667 | 98 | 12795 |
| Osan | city | Cholla-namdo | Korea, Republic of (South) | 34.415 | 126.6427778 | 3 | 15795 |
| Osan | city | Cholla-namdo | Korea, Republic of (South) | 34.8 | 126.6666667 | 32 | 20865 |
| Osan | city | Cholla-namdo | Korea, Republic of (South) | 34.6833333 | 126.75 | 213 | 21386 |
| Osan | city | Cholla-namdo | Korea, Republic of (South) | 34.6333333 | 126.8 | 16 | 21110 |
| Osan | city | Cholla-namdo | Korea, Republic of (South) | 34.5 | 126.9 | 6 | 16699 |
| Osan | city | | Korea, Republic of (South) | 35.9333333 | 126.9166667 | 6 | 28058 |
| Osan | city | | Korea, Republic of (South) | 34.9666667 | 127.0166667 | 935 | 21309 |
| Osan | city | Kyonggi-do | Korea, Republic of (South) | 37.145 | 127.0694444 | 62 | 90679 |
| Osan | city | | Korea, Republic of (South) | 35.0666667 | 127.2833333 | 288 | 21288 |
| Osan | city | | Korea, Republic of (South) | 35.8333333 | 127.35 | 1164 | 28196 |
| Osan | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.6602778 | 127.3777778 | 55 | 22184 |
| Osan | city | Kyongsang-namdo | Korea, Republic of (South) | 35.2752778 | 127.99 | 170 | 42161 |
| Osan | city | Kyongsang-namdo | Korea, Republic of (South) | 35.030556 | 128.1861111 | 528 | 42287 |
| Osan | city | Kangwon-do | Korea, Republic of (South) | 37.3572222 | 128.7852778 | 1548 | 9363 |
| Osan | city | Kyongsang-namdo | Korea, Republic of (South) | 35.3688889 | 128.7869444 | 13 | 42119 |
| Osan | city | Kyongsang-bukto | Korea, Republic of (South) | 36.8830556 | 129.4161111 | 0 | 6906 |
| Osan-dong | city | Kyonggi-do | Korea, Republic of (South) | 37.7 | 127.2166667 | 400 | 90027 |
| Osan-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.4908333 | 126.3441667 | 98 | 12795 |
| Osan-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.415 | 126.6427778 | 3 | 15795 |
| Osan-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.8 | 126.6666667 | 32 | 20865 |
| Osan-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.85 | 126.7333333 | 3 | 26656 |
| Osan-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.6833333 | 126.75 | 213 | 21386 |
| Osan-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.5 | 126.9 | 6 | 16699 |
| Osan-ni | city | | Korea, Republic of (South) | 35.9333333 | 126.9166667 | 6 | 28058 |
| Osan-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.3880556 | 126.9636111 | 236 | 26810 |
| Osan-ni | city | | Korea, Republic of (South) | 34.9666667 | 127.0166667 | 935 | 21309 |
| Osan-ni | city | Kyonggi-do | Korea, Republic of (South) | 37.145 | 127.0694444 | 62 | 90679 |
| Osan-ni | city | | Korea, Republic of (South) | 35.0666667 | 127.2833333 | 288 | 21288 |
| Osan-ni | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.6602778 | 127.3777778 | 55 | 22184 |
| Osan-ni | city | | Korea, Republic of (South) | 34.6333333 | 127.4666667 | 223 | 8951 |
| Osan-ni | city | Kyongsang-namdo | Korea, Republic of (South) | 35.030556 | 128.1861111 | 528 | 42287 |
| Osan-ni | city | Kyongsang-namdo | Korea, Republic of (South) | 35.15 | 128.55 | 131 | 32693 |
| Osan-ni | city | Kangwon-do | Korea, Republic of (South) | 38.0766667 | 128.6708333 | 147 | 4254 |
| Osan-ri | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.8666667 | 126.3666667 | 0 | 14536 |
| Osan-ri | city | | Korea, Republic of (South) | 35.9333333 | 126.9166667 | 6 | 28058 |
| Osang-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.8527778 | 126.0791667 | 377 | 10674 |
| Osang-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.4908333 | 126.3441667 | 98 | 12795 |
| Osang-ni | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.9833333 | 127.4666667 | 291 | 42668 |
| Osei-ri | city | Kyongsang-namdo | Korea, Republic of (South) | 35.4952778 | 127.8363889 | 341 | 42049 |
| Oseito-ri | city | Cholla-bukto | Korea, Republic of (South) | 36.1222222 | 125.9866667 | 0 | 480 |
| Oseitō-ri | city | Cholla-bukto | Korea, Republic of (South) | 36.1222222 | 125.9866667 | 0 | 480 |
| Osen | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.8166667 | 126.6666667 | 91 | 26670 |
| Osen-ri | city | Kyongsang-namdo | Korea, Republic of (South) | 35.1111111 | 127.8155556 | 298 | 42230 |
| Oshu-ri | city | | Korea, Republic of (South) | 34.7666667 | 127.4 | 0 | 8707 |
| Osi | city | | Korea, Republic of (South) | 34.9 | 127.0666667 | 931 | 21333 |
| Osi-ri | city | | Korea, Republic of (South) | 34.9 | 127.0666667 | 931 | 21333 |
| Osikto-dong | city | Cholla-bukto | Korea, Republic of (South) | 35.9658333 | 126.5683333 | 0 | 2164 |
| Osikto-ri | city | Cholla-bukto | Korea, Republic of (South) | 35.9658333 | 126.5683333 | 0 | 2164 |
| Osil | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.2 | 127.7333333 | 505 | 22316 |
| Osil | city | | Korea, Republic of (South) | 34.8833333 | 127.8833333 | 36 | 24165 |
| Osil-li | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.4833333 | 126.8333333 | 433 | 26782 |
| Osil-li | city | Cholla-bukto | Korea, Republic of (South) | 35.4986111 | 127.3605556 | 377 | 28313 |
| Osim-ni | city | Cholla-namdo | Korea, Republic of (South) | 34.5 | 126.55 | 396 | 20843 |
| Osim-ni | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.4833333 | 127.7666667 | 577 | 22213 |
| Osimi | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.4833333 | 127.7666667 | 577 | 22213 |
| Osin-ni | city | Cholla-bukto | Korea, Republic of (South) | 35.4986111 | 127.3605556 | 377 | 28313 |
| Osipch'i | city | Cholla-namdo | Korea, Republic of (South) | 34.5 | 126.55 | 396 | 20843 |
| Oso | city | Kyongsang-namdo | Korea, Republic of (South) | 35.475 | 128.3569444 | 232 | 42049 |
| Oso-dong | city | Kyongsang-namdo | Korea, Republic of (South) | 35.475 | 128.3569444 | 232 | 42049 |
| Oso-ri | city | Cheju-do | Korea, Republic of (South) | 33.4508333 | 126.9166667 | 22 | 10841 |
| Oso-ri | city | Kyongsang-namdo | Korea, Republic of (South) | 35.4952778 | 127.8363889 | 341 | 42049 |
| Osol-li | city | Taegu-gwangyoksi | Korea, Republic of (South) | 35.6833333 | 128.3713889 | 282 | 17774 |
| Osom | city | | Korea, Republic of (South) | 34.7166667 | 127.3833333 | 0 | 10168 |
| Osondae | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.4833333 | 126.9833333 | 695 | 26782 |
| Osong | city | | Korea, Republic of (South) | 34.8166667 | 128.6 | 55 | 32707 |
| Osong-ni | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.7941667 | 126.3580556 | 29 | 20537 |
| Osong-ni | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.6111111 | 127.3255556 | 55 | 32302 |
| Osong-ni | city | Cholla-bukto | Korea, Republic of (South) | 35.5786111 | 127.4358333 | 980 | 28285 |
| Osong-ni | city | | Korea, Republic of (South) | 34.8166667 | 128.6 | 55 | 32707 |
| Osonggol | city | Kyongsang-bukto | Korea, Republic of (South) | 36.9 | 129.0333333 | 1322 | 17501 |
| Osongjol-li | city | Kangwon-do | Korea, Republic of (South) | 37.9433333 | 128.6636111 | 656 | 9289 |
| Osongjon2-gu | city | Kangwon-do | Korea, Republic of (South) | 37.9433333 | 128.6636111 | 656 | 9289 |
| Osongjong | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.8166667 | 127.2666667 | 360 | 25865 |
| Osongjŏng | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.8166667 | 127.2666667 | 360 | 25865 |
| Osongkol | city | Kyongsang-bukto | Korea, Republic of (South) | 36.9 | 129.0333333 | 1322 | 17501 |
| Osont'ae | city | Kyonggi-do | Korea, Republic of (South) | 37.8141667 | 126.6894444 | 114 | 61819 |
| Ossu-ri | city | Cholla-namdo | Korea, Republic of (South) | 34.4058333 | 126.9461111 | 0 | 4856 |
| Ossŭ-ri | city | Cholla-namdo | Korea, Republic of (South) | 34.4058333 | 126.9461111 | 0 | 4856 |
| Osu-dong | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.7833333 | 127.9666667 | 708 | 22062 |
| Osu-ri | city | Cholla-bukto | Korea, Republic of (South) | 35.5383333 | 127.3286111 | 377 | 28299 |
| Osu-ri | city | | Korea, Republic of (South) | 34.8333333 | 128.6 | 26 | 32707 |
| Osul-li | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.4833333 | 126.8333333 | 433 | 26782 |
| Osumul | city | Inch'on-gwangyoksi | Korea, Republic of (South) | 37.7733333 | 126.4122222 | 36 | 62154 |
| Osumul | city | Ch'ungch'ong-bukto | Korea, Republic of (South) | 36.7833333 | 127.9666667 | 708 | 22062 |
| Osŏl-li | city | Taegu-gwangyoksi | Korea, Republic of (South) | 35.6833333 | 128.3713889 | 282 | 17774 |
| Osŏm | city | | Korea, Republic of (South) | 34.7166667 | 127.3833333 | 0 | 10168 |
| Osŏndae | city | Ch'ungch'ong-namdo | Korea, Republic of (South) | 36.4833333 | 126.9833333 | 695 | 26782 |
| Osŏng-ni | city | Cholla-bukto | Korea, Republic of (South) | 35.5786111 | 127.4358333 | 980 | 28285 |
| Osŏnt'ae | city | Kyonggi-do | Korea, Republic of (South) | 37.8141667 | 126.6894444 | 114 | 61819 |