Jan. 27, 1962
Declared as a Ulsan Specific Industrial Zone
Jun. 1, 1962
Ulsan elevated to city status, Ulsan-gun renamed as Ulju-gun
Sept. 1, 1982
Hakseong-dong divided into Hakseong-dong and Banggu-dong (15 dongs)
Jul. 15, 1985
Implementation of the gu system in Ulsan (Opening of Jung-gu Office - 15 dongs)
Oct. 20, 1990
Jung-gu Office relocated from 123 Haksan-dong to 180-1 Boksan-dong, Jung-gu
Jan. 20, 1992
Banggu-dong divided into Banggu 1-dong and Banggu 2-dong (16 dongs)
Sept. 20, 1992
Byeongyeong-dong divided into Byeongyeong 1-dong and Byeongyeong 2-dong (17 dongs)
Jan. 1, 1995
Si (city) and gun (county) integrated to form the city of Ulsan
Mar. 2, 1995
Boksan-dong divided into Boksan 1-dong and Boksan 2-dong, Taehwa-dong into Taehwa-dong and Daun-dong (19 dongs)
Jul. 15, 1997
Launch of Jung-gu of Ulsan Metropolitan City as an autonomous district (14 dongs). The previous Jung-gu areas of Songjeong-dong, Hyomun-dong, Jinjang-dong, and Yangjeong-dong were transferred to Buk-gu, and Yeompo-dong was transferred to Dong-gu
Jan. 1, 2009
Integration of Okgyo-dong and Seongnam-dong to Jungang-dong (13 dongs)
Sept. 1, 2014
Abolition of Bukjeong-dong, followed by establishment of Seongan-dong (13 dongs)
Apr. 15, 2024
Integration of Boksan 1-dong and Boksan 2-dong to Boksan-dong (12 dongs)