Richmond Hill (2016 population: 195,022) is a city in south-central York Region, Ontario, Canada. Part of the Greater Toronto Area, it is the York Region's third most populous municipality and the 28th most populous municipality in Canada. Richmond Hill is situated between the cities of Markham and Vaughan, north of Thornhill, and south of Aurora. 
Richmond Hill has seen significant population growth since the 1990s. Previously known as the Town of Richmond Hill, the city changed to The City of Richmond Hill in March, 2019. The city is home to the David Dunlap Observatory telescope, the largest telescope in Canada.


The Town of Richmond Hill was founded by a group of British Loyalists in 1794, including Captain John Graves Simcoe. The area was named after Henry Frederick, Duke of Richmond and Lennox (1736–1806), the fourth son of King George III who became the first Duke upon his father's death in 1805. The town grew as a result of its location along Yonge Street, one time Upper Canada's main north-south thoroughfare but which gradually gave way to Highway 7 after completion between Woodstock and Barrie in 1930.

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