Lived in Kingston, Ontario with wife and son Arthur in the 1911 census. They were living at 115 Gore Street at the time.
The Marshall family history has him being a C.P.R. Station Agent; the 1911 census also mentions he worked at the Train Depot.
Obiturary from The Lanark Era on Jan.27,1926: Brighton, ON, Fri. Dec.15th,1925, Frederick Clark. Born in Camden East, he worked for the CPR and had been at Snow Road for some time before moving to Brighton in 1917. His first wife and 8 year old son predeceased him and on April 4th, 1922, he married Mrs. Lena Davidson, who survives with Arthur, a son from the first marriage and Mrs. Chester Hentze of Chaumet, NY, the only remaining member of the Clark family. Burial in Brighton.
He is listed at the time of his death as being of Scottish descent. It also mentions he was a telegraph and general agent for C.P.R. He has been living in Brighton for 8 years. He passed away from complications of Diabetes.