Following the war, Deacon married Florence Campbell, sister of his best friend John Campbell. They moved to Deacon's family farm outside of Unionville, Ontario where they raised a family of six (Campbell, David, Martha, Douglas, Richard and Colin Deacon). He was one of the founders of Markham Stouffville Hospital and also served as president of the Canadian Club of Toronto. Deacon spent most of his working career in business in the financial sector, serving as chair of F.H. Deacon Hodgson Ltd.