The station consists of two elevated island platforms, with the station building underneath. The station has a Midori no Madoguchi staffed ticket office.
Koga Station opened on 16 July 1885. The station was rebuilt with elevated tracks in 1984. On 1 April 1987 the station came under the control of JR East with the privatization of Japanese National Railways (JNR).
Passenger statistics
In fiscal 2019, the station was used by an average of 13,050 passengers daily (boarding passengers only).[1]