

| Prehistoric times |
B.C. 1000 | Formed the early Bronze Age |
|---|---|---|
| Prehistoric people lived (Found dwellings of the blue dagger period and artifacts: Joyang-dong, Jangsa-dong, Domun-dong) | ||
| Ancient times |
551(?) | In the 12th year of King Jinheung in the Silla period, it was included into Silla from Goguryeo |
| 757 | Ingnyeonghyeon, the 16th year of King Gyeongdeok of Silla | |
| Middle ages |
995 | Ingnyeonghyeon, Sangmang-do, the 14th year of Jeongjong |
| 1018 | Ingnyeonghyeon, Donggye the 9th year of Hyeonjong | |
| 1221 | Elevated to Yangju from Ingnyeonghyeon, the 8the year of Gojong | |
| 1257 | Relegated to Deongnyeonghyeon from Yangju, the 44th year of King Gojong | |
| 1260 | Reiterated to Yangju from Deongnyeonghyeon, the first year of King Wonjong | |
| Recent modern times (Joseon) |
1397 | Yangju was elevated to Bu, the 6th year of King Taejo |
| 1413 | Changed from Yangju-bu to Yangju-dohobu, the 13th year of Taejong | |
| 1416 | Changed from Yangju-dohobu to Yangyang-dohobu, the 16th year of Taejong | |
| 1618 | Relegated to Yangyanghyeon, the 10th year of Gwanghae-gun | |
| 1623 | Reiterated to Yangyangdohobu, the first year of Injo | |
| 1688 | Relegated to Yangyanghyeon, the 14th year of Sukjong | |
| 1697 | Reiterated to Yangyangdohobu, the 23th year of Sukjong | |
| 1783 | Relegated to Yangyanghyeon, the 7th year of Jeongjo | |
| 1792 | Reiterated to Yangyangdohobu, the 16th year of Jongjo | |
| 1895 | Changed from Yangju-dohobu to Yangyang-gun, the 32th year of Gojong | |
| Modern times (1910~1950) |
March 1, 1914 |
12 Myeons of Yangyang-gun were rearranged into 7 myeons as follows. There were Seo-myeon, Hyeonbuk-myeon, and Hyeonnam-myeon. Gunnae-myeon (Bunae-myeon), Bunam-myeon, Wisan-myeon were included into Yanguang-myeon; Dong-myeon, Nam -myeon were rearranged into Sonnyang-myeon; Gangseon-myeon and Sahyeon-myeon were into Ganghyeon-myeon; and Domun-myeon and Socheon-myeon were into Docheon-myeon; (Ganseong-gun and Goseong-gun were merged into Ganseong-gun) |
| 1919 | Ganseong-gun was changed to Goseong-gun) | |
| July 1, 1937 |
Toseong-myeon and Jukwang-myeon were included into Yangyang-gun. Docheon-myeon was renamed as Sokcho-myeon. (Myeon office moved from Daepo-ri to Sokcho-ri) | |
| October 1, 1942 |
Sokcho-myeon was elevated to Eup. (Ordinance No.14) | |
| August 24, 1945 |
Under the communist rule | |
| Modern Times (1950~2000) |
January 8, 1951 |
Revived as Eup, under the military authority, as the South Korean soldiers moved into it. |
| October 21, 1954 |
Sokcho-eup, Yangyang-gun (Legislation No.350) | |
| November 17, 1954 |
Transferred to democratic rule | |
| January 1, 1963 |
Elevated to a city from Sokcho-eup (Legislation No 1176) | |
| July 1, 1973 |
13 Dongs as Goseong-gun Toseong-myeon Jangcheolli Sajilli were included into Jangsa-dong (Presidential decree No.6542) | |
| February 15, 1983 |
As parts of Yangyang-gun, Ganghyeon-myeon, Sangbok-ri were included into Seorak-dong, the number of legal Dong is 14, and 13 administrative dongs) (Presidential decree No 11027) | |
| April 1, 1990 |
Beopjeong-dong, Sajindonggwa, Jangcheon-dong were incorporated into Jangsa-dong (Legal dongs: 13, Administrative dongs: 13) (Municipal ordinance No.1293) | |
| October 17, 1998 |
Through integration, the number of administrative Dongs was reduced from 13 to 8. As of late, the number of legal Dongs is 13; the number of administrative dongs is 8 (Municipal ordinance No.1657) |