The town is also known by its nickname, “The Stone Town”, due to the abundance of limestone in the surrounding area, giving rise to numerous limestone buildings and homes throughout the town. St. Marys Cement, a large cement producer founded in the town, capitalized on this close feed stock, and grew to be a major producer of cement in the province of Ontario.
St. Marys is home to the Canadian Baseball Hall of Fame. It is the burial place of Arthur Meighen, Canada’s ninth Prime Minister. Timothy Eaton, who went on to become one of Canada’s most famous retailers, opened his first businesses in Canada in nearby Kirkton, Ontario, and later St. Marys.