WebOct 22, 2012 · Innisfil, Ontario, incorporated as a town in 1991, population 43,326 (2021 census ), 36,566 (2016 census). The town of Innisfil is located 75 km north of Toronto along the shore of Lake Simcoe. History and Settlement. Innisfil is a poetic name for Ireland. The area, formerly used by the Huron-Wendat, was surveyed in 1820.