Windsor is the southernmost city in Canada and is located in Southwestern Ontario at the western end of the heavily populated Quebec City ? Windsor Corridor. It is within Essex County, Ontario, although administratively separated from the county government. Windsor is across the Detroit River and south of Detroit, Michigan in the United States. Windsor is known as The City of Roses and residents are known as Windsorites. Windsor's economy is primarily based on education, manufacturing, tourism, and government services.