[1] Nishi-Ōya Station is served by the Tōbu Ogose Line, a 10.9 km single-track branchline running from Sakado to Ogose, and is located 4.4 km from Sakado.

[2] During the daytime, the station is served by four trains per hour in each direction.

[3] The station consists of a single side platform serving one bi-directional track.

[6] Platform edge sensors and TV monitors were installed in 2008 ahead of the start of driver-only operation on the Ogose Line from June 2008.

[8] Nishi-Ōya Station lies close to the boundary between Sakado and Tsurugashima cities.