History
Sanjō opened on 1 March 1956 on the Kotoden Kotohira Line. The Sanjō–Ōta section was double-tracked on 1 November 2020. The station was destaffed on 29 April 2022. The Ritsurin-kōen–Sanjō section was double-tracked on 20 March 2026, completing double track from Takamatsu-Chikkō all the way through Sanjō to Ōta; a single crossover was installed near the Ritsurin-kōen end of the station to suit the new layout.
History summarized from Japanese & English Wikipedia · last reviewed 2026-05-22.
Notes
Although the station is called Sanjō, it does not stand in Sanjō-machi but in Uenomachi, north of the centre of the Sanjō district. The name is not strictly arbitrary: "Sanjō" comes from the ancient jōri grid that divided Sanuki Province into north-south strips, and the Kotohira Line from its Takamatsu-end terminus to Busshōzan all sits inside the historical Kōtō-gun Sanjō strip.