St. Marys, Ontario

St. Marys is a town in southwestern Ontario, Canada. It is located at the confluence of the north branch of the Thames River and Trout Creek southwest of Stratford, and is surrounded by the Township of Perth South in Perth County, Ontario. St. Marys operates under its own municipal government that is independent from the county's government. Nonetheless, the three entities "enjoy a large degree of collaboration and work together to grow the region as a leading location for industry and people". Statistics Canada treats St. Marys as part of Perth County when publishing census data, and most Perth County publications do the same, at least in some sections of their documents.

The town is also known as "The Stone Town" from the area's abundant limestone, often used as a building material. St. Marys Cement, a large cement producer that was founded in the town, capitalized on this readily available feed stock, and grew to be a major producer of cement in 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.