- Chatham is a city located in the province of Ontario, Canada. It is part of the municipality of Chatham-Kent, which is situated in the southwestern part of the province. Chatham has a population of approximately 45,000 people and is known for its historic downtown area, rich agricultural heritage, and vibrant arts and culture scene. The city is also home to several parks and natural areas, providing opportunities for outdoor activities such as hiking, fishing, and boating. Chatham has a diverse economy, with industries including automotive manufacturing, agriculture, and tourism.