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St. Marys is a town in southwestern Ontario located southwest of Stratford. St. Marys is located on the River Thames in the County of Perth.
St. Marys is the burial place of Arthur Meighen, Canada's 9th Prime Minister.
According to the 2001 Statistics Canada Census:
| North: Perth South | ||
| West: Perth South | St. Marys | East: Perth South |
| South: Perth South |