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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, was 112,719.

Thornhill is a provincial electoral district in Ontario, Canada, that has been represented in the Legislative Assembly of Ontario since 1999. It covers the community of Thornhill, Ontario, which is made up of portions of Vaughan and Markham, and was created in 1999 from parts of Markham and York Centre ridings. It consists of the part of the city of Vaughan that is east of Highway 400 and south of Rutherford Road, and the part of the city of Markham west of Bayview Avenue.It is the only riding in Ontario with a Jewish plurality. 32.8% of the population is Jewish, the highest in the province.

Thornhill is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1997. It covers its namesake Thornhill neighbourhood, which is split between the Cities of Vaughan and Markham. The Vaughan portion also includes parts of the city east of Highway 400 and south of Rutherford Road, including the largely industrial district of Concord and Vaughan's planned downtown; Vaughan Metropolitan Centre. The part in the City of Markham is restricted its portion of Thornhill itself (but does not include it all) west of Bayview Avenue. The riding was created in 1996 and the east end of the riding was split off into other ridings in 2012. The riding was initially safe for the Liberals, and they won large majorities of the vote in its first two elections. In 2004, the large Jewish population started shifting toward the Conservative Party, and the Conservatives won the riding in 2008. After being targeted by the Conservatives as part of their strategy to win a majority in 2011, the riding became a Conservative stronghold.

Thornhill Secondary School (TSS) is a secondary school in Thornhill, Ontario, Canada. Founded in 1955, the school is administered by the York Region District School Board system.

St Luke Catholic Learning Centre is a high school in Thornhill, Ontario, Canada. It is administered by the York Catholic District School Board.

The Heintzman House (c. 1817), also known as Sunnyside Manor Farm, is one of the oldest buildings in Thornhill-Markham, Ontario, where it sits on the crest of Bay Thorn Drive.

Future School is a co-educational independent school in Toronto, Ontario, Canada. Established in 1997, the school was previously known as Netskills College and FutureSkills High School, before adopting its current name.

Langstaff is a residential area at the tripoint of the cities of Richmond Hill, Markham, and Vaughan in York Region, Ontario, Canada. Located near Highway 7 and Yonge Street, the homes in the area date to the 1960s and 1970s. The East Don River and CN Rail Bala subdivision runs through the area. Langstaff is a former hamlet likely named for John Langstaff (1774-1865), a settler who arrived sometime between 1803 and 1808 from Piscataway, Middlesex, New Jersey and established a farm along Yonge Street. The living members of the family are longer living in the area, as descendants of James Langstaff have moved out of Ontario. The old farm became the notorious Langstaff Jail Farm, which has since disappeared and the area is now dominated by a retail strip. The only reminder of the Langstaff family is Langstaff Road.

Holy Cross Catholic Cemetery is a cemetery in Thornhill, Ontario, Canada. It is owned and operated by the Roman Catholic Archdiocese of Toronto.

Centerpoint Mall (formerly Towne and Countrye Square) is a shopping mall located in Newtonbrook,Toronto, Ontario, Canada on the southwest corner of Steeles Avenue and Yonge Street at the boundary of Toronto.

Netivot HaTorah Day School (Hebrew: נתיבות התורה) is a private, coeducational Orthodox Jewish elementary school in Thornhill, Ontario, Canada. As of 2008, it enrolls 600 students from Junior Kindergarten to Grade 8. The school is affiliated with Mercaz (formerly known as the Board of Jewish Education), the educational pillar of the UJA Federation of Greater Toronto.

Shouldice Hospital (formerly Shouldice Hernia Centre) is a private hospital located in Markham, Ontario, Canada, at 7750 Bayview Avenue in the Thornhill district. The hospital specializes in hernia care. Its location is the former estate of George McCullagh, a publisher who created The Globe and Mail newspaper in 1936.