In the reign of the King Munjong (Joseon Dynasty), Wanpo-hyeon and Ungsin-hyeon was incorporated into Ungcheon-hyeon, renamed to Uncheon-gun after Gapo Reformation, and incorporated into Changwon-bu in 1908.
It was in 1912 that the name of "Jinhae" was first introduced in this region as "Jinhae-myeon", which was raised to Jinhae-eup, Changwon-gun in 1931, and to Jinhae-si on September 1, 1955. Lastly, Ungcheon was incorporated into Jinhae-si in 1973 and Ungdong in 1983.
It was in 1912 that the name of "Jinhae" was first introduced in this region as "Jinhae-myeon", which was raised to Jinhae-eup, Changwon-gun in 1931, and to Jinhae-si on September 1, 1955. Lastly, Ungcheon was incorporated into Jinhae-si in 1973 and Ungdong in 1983.
| 1990 | 1993 Y. | Jeo-do and Mangwa-do was returned to Geoje-gun on December 1. (By the Presidential Decree No. 14006) |
|---|---|---|
| 1983 Y. | Ungdon-myeon in Changwon-gun was incorporated into Jinhae-si on February 15. (By the Presidential Decree No. 11027) | |
| 1975 Y. | Jeo-do and Mangwa-do in Geoje-gun was incorporated into Jinhae-si on October 1. (By the Presidential Decree No. 7818) | |
| 1973 Y. | Ungcheon-myeon of Changwon-gun was incorporated into Jinhae-si on July 1. (By the Presidential Decree No. 6542) | |
| 1955 Y. | Jinhae-eup was raised to Jinhae-si on September 1 | |
| 1950 | 1931 Y. | Jinhae-myeon was raised to Jinhae-eup in April |
| 1918 Y. | Ungeup-myeon was renamed to Ungcheon-myeon in January | |
| 1916 Y. | Yohang-bu was opened at Jinhae Naval Station in April | |
| 1914 Y. | Changwon-gun was separated from Masan-bu and changed to the jurisdiction of Changwon-gun in April. | |
| 1912 Y. | "Jinhae Garrison against Japanese invaders" in Songjinpo was moved to Jinhae in April. | |
| 1912 Y. | Reorganized into Jinhae-myeon, Masan-bu, including partial Ungjung-myeon and Ungseo-myeon, and excluding Ungcheon and Ungdong in January | |
| 1910 Y. | Changwon-bu was incorporated into Masan-bu to be under the jurisdiction of Masan-bu, in October. | |
| 1908 Y. | Ungcheon-gun and Jinhae-gun (presently "Samjin in Changwon-gun) were incorporated and reorganized into Changwon-bu in September. | |
| 1900 | 1996 Y. | (The 1st year of Geonyang) Executed 13-do system. Changed to Ungcheon-gun, Gyeongsangnam-do, Consisted of 8 myeons under the jurisdiction. |
| 1895 Y. | (The 32nd Year of King Gojong) Executed 23-bu system. Reorganized into Uncheon-gun under the jurisdiction of Jinju-bu. | |
| 1512 Y. | Reverted to Ungcheon-hyeon. | |
| 1510 Y. | (The 5th Year of King Jungjong) Japanese invasion called "Sampowaenan". Raised to Ungcheondohobu. |