Richmond Hill is a town located in Southern Ontario, Canada in the southern portion of York Region, Ontario. It is part of the Greater Toronto Area and is bounded by Bloomington Rd. to the north, York Regional Road 7 to the south, Bathurst St. to the west, and Ontario Highway 404 to the east. Its southern limit is about 4 kilometres north of the Toronto city limit, Steeles Avenue, and approximately 20 kilometres north of the downtown core of Toronto. The town extends 14 kilometres north-south and 7 kilometres east-west. It is the third most populous municipality in York Region and the 28th most populous municipality in Canada.Richmond Hill has in recent years seen a huge population upsurge, being Canada's fastest-growing community in the 1990s. Richmond Hill is an affluent town with a large number of people employed in areas of business, finance, industry and healthcare. The town is home to the world-renowned David Dunlap Observatory telescope, at one time the second largest telescope in the world, and still the largest in Canada. It is twinned with Lakeland, Florida.