Chaeryŏng County was first founded by the kingdom of
Koguryo, who called it Siksŏng (), and later Hanseong (KR: 한성, Hanja: 漢城). Hanseong was named one of the three capitals of Goguryeo, along with Pyongyang and Gungnae. After the fall of Goguryeo in 668, it became the southern center of the
Goguryeo restoration movements led by Goguryeo commander
Geom Mojam. The
Koryo dynasty, the successor state to Goguryeo, gave it its current name in 1217. In 1415, it was promoted to county level under the
Yi. Chaeryŏng was briefly merged into the newly formed
Hwanghae District in 1895 during an experimental redistricting, but was restored to its previous form in 1896. During
Japanese rule, which lasted from 1910 to 1945, the county was called Sainei (載寧). The county's current form was settled in the 1952 redistricting changes. ==Transportation==