Kulwin Post Office opened on 16 August 1920 when the railway arrived and closed on 19 November 1974.
Kulwin State School (No. 4375) opened in the Kulwin Soldiers' Hall on 8 January 1929. A standalone building, formerly at Nowingi State School, was re-erected and occupied in April 1933, with an additional workroom erected by parents in 1934. The school closed on 5 June 1950, with the building being removed to Robinvale Consolidated School.