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1910-10-21   Originally called Dong-myeon, Ulsan-gun.
1937-07-01      It became Bangyeojin-eup.
1962-06-01      Incorporated as branch office of Bangyeojin-eup when Ulsan
became city.
1979-05-01      Yeom-po-dong was subdivided into Yeom-po 1(il)-dong and
Yeom-po 2(i)-dong.
1983-05-01      Yeom-po 1(il)-dong and Yeom-po 2(i)-dong were renamed
Yang-jeong-dong and Yeom-po-dong, respectively.
1983-10-01      Jeon-ha-dong was subdivided into Jeonha 1(il)-dong and
Jeonha 2(i)-dong by Municipal Ordinance No. 914.
1985-07-15      Merged to Bang-yeo-jin Branch Office, Jung-gu by Presidential Decree No. 11716.
1985-08-10      Bangyeojin Branch Office became Municipal Administration Office based on Municipal Ordinance No. 1104.
1985-10-15      Ilsan-dong was subdivided into Ilsan-dong and Hwajeon-dong.
1988-01-01      Bangyeojin Branch Office in Ulsan City became Dong-gu Office based on Presidential Decree No. 12367.
1992-01-06      Hwa-eong-dong was subdivided into Hwajeong-dong and Daesong-dong.
1995-03-02      Jeonha 2(i)-dong was subdivided into Jeonha 2(i)-dong and Jeonha 3(sam)-dong.
Nammok 1(il)-dong was subdivided into Nammok 1(il)-dong and Nammok 3(sam)-dong.
1997-07-15      Dong-gu became local government of Ulsan.
1997-07-15      Yeompo-dong in Jung-gu was merged into Yeompo-dong in
Dong-gu.
1998-03-01      Yeompo-dong was merged into Buk-gu from Dong-gu.
1998-10-01      Jujeon-dong was merged into Nammok 3(sam)-dong.
2009. 01.01   jeonha 3(sam) was merged into jeonha 2(i)