탄천을 건너면서 잠실 일대를 바라보면 99칸 한옥의 대청마루가 보인다고 하여 일대를 대청마을로 불렀다고 전해진다.
It is said that the area was called Daecheong Village because it is said that if you look at the Jamsil area while crossing Tancheon Stream, you can see the Daecheong Maru of 99-room hanok.