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)