Kingsville is a town in Essex County in southwestern Ontario, Canada. It is Canada's southernmost municipality with town status. The town had …Kingsville is a town in Essex County in southwestern Ontario, Canada. It is Canada's southernmost municipality with town status. The town had a population of 22,119 in the Canada 2021 Census a 2.6% increase from the previous census figure of 21,552 in the Canada 2016 Census.