Baekje Dynasty Usul-Gun, Hwangdeungya-Gun Silla Dynasty Bipung-Gun, Hwangsan-Gun Goryeo Dynasty Gongju-Mok, Deokjin-Hyeon Joseon Dynasty Hoedeok-Gun, Jinjam-Gun (1895) April 1, 1931 Daejeon-Eup (proclaimed on March 1, 1931)  Oct. 1, 1935 Daejeon-Bu (proclaimed on Sep. 28, 1935) Aug. 15, 1949 Daejeon-City (proclaimed on July 4, 1949) July 1, 1971 Seobu Branch of Daejeon City(proclaimed on June 2, 1971) Sep. 1, 1977 Jung-Gu, Daejeon City Jan. 1, 1988 Seo-Gu, Daejeon City Jan. 1, 1989 Seo-Gu, Daejeon City under the direct control of central government (incorporated into Giseong-Myeon, Daedeok-Gun) Dec. 1, 1991 Samcheon-Dong Seo-Gu (separated from Yongmun-Dong_ Sep. 1, 1992 Jeongrim-Dong, Seo-Gu (separated from Doma 2-Dong) Nov. 1, 1993 Tanbang-Dong, Seo-Gu (separated from Yongmun-Dong) Dunsan-Dong, Seo-Gu (separated from Samcheon-Dong) Wolpyeong-Dong, Seo-Gu (separated from Galma-Dong) July 1, 1994 Wolpyeong 1 & 2-Dong, Seo-Gu (separated from Wolpyeong-Dong) Jan. 1, 1995 Seo-Gu, Daejeon Metropolitan City (proclaimed on Dec. 21, 1994) Jan. 1, 1996 Dunsan 2-Dong, Seo-Gu (separated from Dunsan-Dong) Aug. 20, 1996 Nae-Dong, Seo-Gu (separated from Gajang-Dong) Jan. 1, 1998 Wolpyeong 3-Dong, Seo-Gu (separated from Wolpyeong 1-Dong) Mannyeon-Dong, Seo-Gu (separated from Wolpyeong 2-Dong) Galma 2-Dong, Seo-Gu (separated from Galma-Dong) Feb. 1, 2003 Gwanjeo-Dong, Seo-Gu (separated from Gasuwon-Dong) Feb. 4, 2005 Gwanjeo 2-Dong, Seo-Gu (separated from Gwanjeo-Dong)