| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Yangdondanji | city | Seoul | Korea, Republic of (South) | 33.43 | 126.44 | 1669 | 55715 |
| Yanghwadong | city | Seoul | Korea, Republic of (South) | 37.54 | 126.89 | 65 | 1612044 |
| Yangjaedong | city | Seoul | Korea, Republic of (South) | 37.48 | 127.03 | 62 | 1080475 |
| Yangpyeong-dong | city | Seoul | Korea, Republic of (South) | 37.52 | 126.89 | 36 | 1665903 |
| Yangpyeongdong | city | Seoul | Korea, Republic of (South) | 37.52 | 126.89 | 36 | 1665903 |
| Yangwon | city | Seoul | Korea, Republic of (South) | 37.62 | 127.11 | 150 | 1231450 |
| Yeogiso | city | Seoul | Korea, Republic of (South) | 37.65 | 126.94 | 285 | 496015 |
| Yeokchon-dong | city | Seoul | Korea, Republic of (South) | 37.60 | 126.92 | 101 | 1020907 |
| Yeokchondong | city | Seoul | Korea, Republic of (South) | 37.60 | 126.92 | 101 | 1020907 |
| Yeoksamdong | city | Seoul | Korea, Republic of (South) | 37.50 | 127.04 | 95 | 1163819 |
| Yeomgok-dong | city | Seoul | Korea, Republic of (South) | 37.47 | 127.06 | 236 | 1193435 |
| Yeomgokdong | city | Seoul | Korea, Republic of (South) | 37.47 | 127.06 | 236 | 1193435 |
| Yeomtong-gol | city | Seoul | Korea, Republic of (South) | 37.46 | 127.05 | 164 | 1038604 |
| Yeongcheon-dong | city | Seoul | Korea, Republic of (South) | 37.57 | 126.96 | 190 | 1410014 |
| Yeongcheondong | city | Seoul | Korea, Republic of (South) | 37.57 | 126.96 | 190 | 1410014 |
| Yogiso | city | Seoul | Korea, Republic of (South) | 37.65 | 126.94 | 285 | 496015 |
| Yokch'on-dong | city | Seoul | Korea, Republic of (South) | 37.60 | 126.92 | 101 | 1020907 |
| Yomgong-ni | city | Seoul | Korea, Republic of (South) | 37.46 | 127.05 | 164 | 1038604 |
| Yomt'ong-gol | city | Seoul | Korea, Republic of (South) | 37.46 | 127.05 | 164 | 1038604 |
| Yon-ch'on | city | Seoul | Korea, Republic of (South) | 37.62 | 127.05 | 72 | 1880443 |
| Yongdong | city | Seoul | Korea, Republic of (South) | 37.64 | 127.08 | 98 | 1461236 |
| Yongsan | city | Seoul | Korea, Republic of (South) | 37.53 | 126.97 | 72 | 1511961 |
| Yongsan-dong | city | Seoul | Korea, Republic of (South) | 37.54 | 126.98 | 157 | 1326358 |
| Yongsandong | city | Seoul | Korea, Republic of (South) | 37.54 | 126.98 | 118 | 1341874 |
| Yulhyeondong | city | Seoul | Korea, Republic of (South) | 37.47 | 127.11 | 52 | 1390261 |
| Yunnamdong | city | Seoul | Korea, Republic of (South) | 33.47 | 126.37 | 104 | 9861 |
| Yŏkch’on-dong | city | Seoul | Korea, Republic of (South) | 37.60 | 126.92 | 101 | 1020907 |
| Yŏmt’ong-gol | city | Seoul | Korea, Republic of (South) | 37.46 | 127.05 | 164 | 1038604 |
| Yŏn-ch’on | city | Seoul | Korea, Republic of (South) | 37.62 | 127.05 | 72 | 1880443 |