Campbellford is a small town in Northumberland County, Ontario, Canada, in the municipality of Trent Hills.Located at 44°18′N 77°48′W, Campbellford lies approximately midway between Toronto and Ottawa. It is situated on both the Trent-Severn Waterway and the Trans Canada Trail. It can be reached from Highway 401 by exiting at Brighton (Exit 509) and going north on County Road 30.