dubbed as 'Dasachon' (county of much sand) during Jinguk period, and was a part of 'Nangnoguk', one of 12 Byeonhan countries. According to 'History of the Three Kingdoms', it was 'Handasa-guen' and revised to 'Hadong-guen' in 757 during the reign of King Gyeongdeok. In Goryeo period, it was 'Hadong-hyeon' and in 1414, the 14th year of Taejong, it became 'Hanamhyeon' with 'Namhaehyeon'
하동군의 시대별 연혁
||It used to be a part of 'Nangnoguk', one of 12 Byeonhan countries.
|Period of the Three Kingdoms
||It was dubbed as Dasasung or Dasa-guen.
|The Unified Silla Period
||It was dubbed as Handasa-guen during the 5th years reign (year 585)of King Sinmun and was renamed to Hadong-guen during the 16 years reign (year 757) of King Gyeongdeog Hadong.
||It was called Hadong-hyon, a part of Jinjumok.
||Promoted its status to regional military command of Hadong during the 30th years (1704) reign of Sukjong and had magistrate, and become Hadong-guen, Jinjubu in 1895.
하동군의 현대사 연혁
||Called Hadong-gun, Jinju-bu by the 23rd of 98th of Royal edict
||Incorporated Okjong-myeon, Cheongam-myeon and Jinju-guen
||Incorporated some part of Seomjin-ri, Gwangyang-guen, Jeonnam by ordinance No.175 of government ministry.
||Incorporated some part of Geumyang-myeon and Nam-myeon, and retitled into Geumnam-myeon.
||Promoted from Hadong-myeon to Hadong-eup of 1 Eup and 11 Myeon by ordinance No.197 of government ministry.
||Incorporated Won-gye-ri, Okjong-myeon into Jinyang-gun by law No.360.
||Established Sinheung branch office in Hwagae-myeon by county regulation No.100 1 eup, 11 Myeon and 1 branch office.
||Established the Witae branch office in Cheongam-myeon; 2 branch offices for 11 myeon in 1 eup by ordinance No.156 of government ministry.
||Transferred Jungtae-ri of Okjong-myeon into Sicheon-myeon by Presidential decree No. 11027.
||Established the Galsa branch office in Geumnam-myeon; 3 branch offices for 11 myeon in eup by ordinance No.957 of government ministry.
||Transferred Sulsang-ri, Geumnam-myeon into Jingyo-myeon by ordinance No.1053 of government ministry.
||The Galsa branch office in Geumnam-myeon was promoted to Geumseong-myeon; 2 branch offices for 12 myeon, 1 eup by ordinance No.1076 of government ministry.
||Closed Sinheung branch office in Hwagae-myeon by ordinance No.1418 of government ministry, thus it has 1 branch office, 12 myeon, 1 eup.
||The Witae branch office in Cheongam-myeon was closed by ordinance No.1494 of government ministry, thus it has 1 eup, 12 myeon.
||Witae-ri,Gunhang-ri and Hwasin-ri in Cheongam-myeon were incorporated to Okjong-myeon by ordinance No. 1632 of government ministry.