History
The station opened on 20 August 1891 as part of the Kyushu Railway's expansion from Tosu to Saga. When the line was further extended on 5 May 1895 to Takeo (today Takeo-Onsen), the station, then called Yamaguchi, became an intermediate stop. Following the 1907 nationalisation of the Kyushu Railway, the route was designated the Nagasaki Main Line on 12 October 1909, and the station was renamed Hizen-Yamaguchi on 1 March 1913. On 1 December 1934 the segment through Takeo to Sasebo was redesignated the Sasebo Line, branching here. With the privatisation of Japanese National Railways on 1 April 1987 the station passed to JR Kyushu. On 23 September 2022 it was renamed Kōhoku, taking the name of the town it serves.
History summarized from Japanese & English Wikipedia · last reviewed 2026-05-18.
Notes
The station carried the Hizen-Yamaguchi name for over a century before being renamed Kōhoku on 23 September 2022, aligning its identity with the surrounding town.