Tillsonburg is a town in Oxford County, Ontario, Canada with a population of 18,615 located about 50 kilometres southeast of London, on High…Tillsonburg is a town in Oxford County, Ontario, Canada with a population of 18,615 located about 50 kilometres southeast of London, on Highway 3 at the junction of Highway 19. Prior to European settlement, the present site of Tillsonburg was home to Indigenous tribes. The Tillsonburg Village Site, a 14th century Iroquoian village, was excavated in 2001 and 2008, in the northwest corner of the town, and contained 15 longhouses.