date	origin and development
Three-kingdom era (Gaya)	It was named "Golpo"
757 (King Gyeongdeok of the Silla dynasty)	Happo-Hyun established.
1282 (King Chungnyeor of the Goryeo dynasty)	Hoewon-Hyun established.
1408 (King Taejong of the Joseon dynasty)	Changwon-bu established.
May. 1, 1899	Masan port opened.
Apr. 1, 1914	Masan-bu established.
Aug. 15, 1949	The name was changed to Masan city.
Jul. 1, 1973	Part of Changwon-gun incorporated into Masan city.
Apr. 1, 1980	Changwon city created as separate entity.
May. 10, 1989	Happo and Hoewon branch offices opened.
Jul. 1, 1990	Happo and Hoewon branch offices changed to Happo-gu and Hoewon-gu, respectively.
Jan. 1, 1995	nified city of Masan city established.
Dec. 31, 2000	Happo and Hoewon branch offices discontinued.