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Thornhill is a suburban district in the Regional Municipality of York in Ontario, Canada. The western portion of Thornhill is within the City of Vaughan and its eastern portion is within the City of Markham, with Yonge Street forming the boundary between Vaughan and Markham. Thornhill is situated along the northern border of Toronto, centred on Yonge, and is also immediately south of the City of Richmond Hill. Once a police village, Thornhill is still a postal designation. As of 2016, its total population, including both its Vaughan and Markham sections. History The corner of Old Yonge Street and Centre Street Early history Thornhill was founded in 1794. The original boundaries were the northern bounds of the Ladies Golf Club on the east side of Yonge and further north on the west side of Yonge; southern end between John Street and Arnold Avenue/Elgin Street. Its first settlers on Yonge Street in Thornhill were Asa Johnson (who settled on the Vaughan side) and Nicholas Miller (c. 1760–1810; who settled on the Markham side). Of particular importance was the arrival of Benjamin Thorne (January 4, 1794 – July 2, 1848) in 1820 from Dorset, England, who was operating a gristmill, a sawmill, and a tannery in the community. The settlement came to be known as Thorne's Mills, and later, Thorne's Hill, from which its current name is derived. (Thorne committed suicide in 1848, after a serious wheat market crash. Radial car to Thornhill on the Metropolitan line Between 1830 and 1848, Thornhill experienced a period of continued growth and prosperity. The business district of Thornhill developed on its portion of Yonge Street, between Centre Street and John Street. Stagecoaches travelled between Holland Landing (Lake Simcoe) and York (Toronto) as Yonge Street's road conditions improved with new stonework. During this prosperous period, several churches, many of which are still standing today, were constructed. Thornhill's location along Yonge Street, a major transportation route, proved beneficial to the community's growth throughout much of the twentieth century. The implementation of the electric radial Metropolitan line along Yonge Street in 1898 running north to Sutton and south to Toronto meant that, for the first time, people could reside in Thornhill and work in Toronto. By the 1920s, automobiles also facilitated travel along Yonge Street. 20th and 21st centuries In 1931, Thornhill became a "Police Village"; before that time, Thornhill had no independent status and was split between the townships of Vaughan and Markham along Yonge Street, since the creation of municipal government in 1850. Before 1931, each township administered its half of the village. The creation of the Police Village gave Thornhill its own political boundaries. The village was headed by a reeve. In 1971, York Region was created, part of a wave of municipal re-organization which converted many townships into towns and eliminated many of the municipal forms of organization which had existed within those townships. The establishment of a regional administration effectively eliminated the Police Village of Thornhill. Thornhill's administration reverted to Markham and Vaughan, which were enlarged in territory and upgraded to Town status at this time. However, many social institutions remained organized around the former municipal entities eliminated in 1971. Like neighbouring communities such as Woodbridge, Maple, and Unionville – and more so than was the case for historic suburban communities within the City of Toronto – community organizations such as local newspapers, and sports teams continued to operate under a Thornhill administrative structure. As an example, until the mid-1990s residents of Thornhill who wanted to play high-level hockey were required to play for a Thornhill team. While the old village of Thornhill revolved around Yonge Street between Centre and John Streets, the neighbourhood is typically thought to be between Dufferin Street to the west, Highway 7 to the north, Steeles Avenue to the south, and Highway 404 to the east. Suburbanization Thornhill's growth since the 1960s and 1970s has been largely connected to its location bordering what is now the City of Toronto. Growth has continued apace. Developments have sprung up across various areas of Thornhill in each of the municipal districts which encompass Thornhill, following the development patterns of the Greater Toronto Area.