- Windsor is a city in Ontario, Canada. It is located in southwestern Ontario, directly across the Detroit River from Detroit, Michigan. Windsor is the southernmost city in Canada and is known for its automotive industry, with several major automotive manufacturing plants located in the area. The city has a population of around 230,000 people and offers a diverse cultural scene, with a mix of Canadian, American, and British influences. Additionally, Windsor is home to the University of Windsor, several parks and gardens, and the Windsor-Detroit International Crossing, which is one of the busiest border crossings between Canada and the United States.