Thornhill (
2011 population 110,430) is a neighbourhood 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 city 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 and south-west of
Richmond Hill.