The station opened on 1 May 1929.[1] It closed on 10 October 1954, but reopened on 4 June 1976.[1]
Station numbering was introduced on all Seibu Railway lines during fiscal 2012, with Shimo-Yamaguchi Station becoming "SI40".[3]
Passenger statistics
In fiscal 2019, the station was the 72nd busiest on the Seibu network with an average of 8,012 passengers daily.[4] The passenger figures for previous years are as shown below.
^ abcdTerada, Hirokazu (July 2002). データブック日本の私鉄 [Databook: Japan's Private Railways]. Japan: Neko Publishing. p. 202. ISBN4-87366-874-3.
^Kawashima, Ryozo (February 2011). 日本の鉄道 中部ライン 全線・全駅・全配線 第11巻 埼玉南部・東京多摩北部 [Railways of Japan - Chubu Line - Lines/Stations/Track plans - Vol 11 Southern Saitama and Northern Tama Tokyo]. Japan: Kodansha. p. 11/77. ISBN978-4-06-270071-9.
^西武線全駅で駅ナンバリングを導入します [Station numbering to be introduced at all Seibu stations] (PDF). News Release (in Japanese). Japan: Seibu Railway. 23 February 2012. Archived from the original(PDF) on 2015-09-24. Retrieved 10 February 2013.
^駅別乗降人員(2019年度1日平均 [Average daily station usage figures (fiscal 2019)] (PDF) (in Japanese). Japan: Seibu Railway. Retrieved 6 January 2021.
^ ab駅別乗降人員 2010(平成22)年度 1日平均 [Average daily station usage figures (fiscal 2010)] (PDF) (in Japanese). Japan: Seibu Railway. Archived from the original(PDF) on 26 June 2011. Retrieved 9 February 2013.
^駅別乗降人員 2011(平成23)年度 1日平均 [Average daily station usage figures (fiscal 2011)] (PDF) (in Japanese). Japan: Seibu Railway. Archived from the original(PDF) on 1 November 2012. Retrieved 9 February 2013.
^ ab駅別乗降人員 2013(平成25)年度 1日平均 [Average daily station usage figures (fiscal 2013)] (PDF) (in Japanese). Japan: Seibu Railway. Archived from the original(PDF) on 14 July 2014. Retrieved 16 July 2014.
^所沢市立山口中学校-アクセス [Tokorozawa Municipal Yamaguchi Junior High School-Access] (in Japanese). Retrieved 22 May 2023.