During year 14 and 16 of king Taejong's regime, the two localities Buryeong-hyeon and Boan-hyeon were merged and separated several times. Then in December 1416, the two localities were merged and was named Buan, the "bu" coming from Buryeong and the "an" coming from Boan. The following year a locality named Heungdeokjin was made a part of Buan and was renamed as Buanjin. A high-level civil servant named the Byeongmasa ruled over the county. In 1423 (5th year of King Sejong's regime), the ruler was changed from Cheomjeoljesa to Hyeongam. Locality Buan was changed into Boan County in 1895 (32nd year of King Gojong's regime), when several different terms representing localities (bu, mok, gun, and hyeon) were unified to a single therm - gun(county). In 1914, during the Japanese occupation, the administrative district was changed: Wido become a part of Yeonggwang County(South Jeolla Province), and Biando was annexed to Gunsan City. Baeksan, Geoma, and Deoklim of Gobu County were annexed to Buan County.