Thornhill (2006 population 106,394) is a community in the Greater Toronto Area of Southern Ontario, Canada, located on the northern border of the city of Toronto. Once a municipal village, Thornhill is now a community and postal designation geographically split into two municipalities along Yonge Street, the city of Vaughan to the west and the town of Markham to the east. According to the 2001 Census, the population of Thornhill-Vaughan was 56,361, and the population of Thornhill-Markham was 47,333.It is immediately south of Richmond Hill.

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