Hadong County is a county in South Gyeongsang Province, South Korea. It is located on the far-west side of the province, bordering South Jeol…Hadong County is a county in South Gyeongsang Province, South Korea. It is located on the far-west side of the province, bordering South Jeolla Province. The county office is located at Hadeong-eup. Hadong was originally called Dasachon when it was a part of the Jin state. It later became part of Nangnoguk, one of the Byeonhan confederacy's twelve statelets. According to the History of the Three Kingdoms, the region was called Handasa-gun before changing into Hadong-gun in 757 CE during the reign of King Gyeongdeok of Silla. During the Goryeo dynasty, the area was known as Hadong-hyeon. Amid the reign of the Joseon-era King Taejong in 1414, it became known as Hanamhyeon with Namhaehyeon. In 1702, Agyang-myeon was added to Hadong-gun. Hadong was raised to the status of Hadongdohobu in 1740, the thirtieth year of King Sukjong's reign.