 Ontario electoral district
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| Federal electoral district | ||
| Legislature | House of Commons | |
| MP | Lui Temelkovski Liberal | |
| District created | 2003 | |
| First contested | 2004 | |
| Last contested | 2006 | |
| Provincial electoral district | ||
| Legislature | Legislative Assembly of Ontario | |
| MPP | Helena Jaczek Liberal | |
| District created | 2006 | |
| First contested | 2007 | |
| Demographics | ||
| Population (2006) | 169,642 | |
| Electors (2007) | 123,138 | |
| Area (km²) | 718 | |
| Pop. density (per km²) | 236.3 | |
| Census divisions | York | |
| Census subdivisions | Markham, Richmond Hill, Whitchurch-Stouffville, King | |
 Province of Canada electoral district
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| Defunct pre-Confederation electoral district | ||
| Legislature | Legislative Assembly of the Province of Canada | |
| District created | ||
| First contested | 1841 | |
| Last contested | 1867 | |
 Manitoba electoral district
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| Defunct federal electoral district | ||
| Legislature | House of Commons | |
| District created | 1914 | |
| District abolished | 1947 | |
| First contested | 1917 | |
| Last contested | 1945
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 Nunavut electoral district
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| Territorial electoral district | ||
| Legislature | Legislative Assembly of Nunavut | |
| MLA | Joe Allen Evyagotailak | |
| District created | 1999 | |
| First contested | 1999 | |
| Last contested | 2004 | |
| Demographics | ||
| Population (2006) | 1,302 | |
| Electors | ||
| Area (km²) |
Warning: demo-area is undefined | |
| Census divisions | Kitikmeot Region | |
| Census subdivisions | Kugluktuk | |
Oak Ridges—Markham is a federal and provincial electoral district in Ontario, Canada, that has been represented in the Canadian House of Commons since 2004. It elected its first representative in the Legislative Assembly of Ontario in the 2007 provincial election. Its population in 2006 was 169,642.
The district covers part of the suburbs north of Toronto. It includes the Town of Whitchurch-Stouffville, most of the Township of King (excepting extreme northeast) the northern portions of the Town of Richmond Hill, and the northern and eastern portions of the Town of Markham.
The electoral district was created in 2004 52.5% from Oak Ridges, 30% from Markham, 13% from Vaughan—King—Aurora, and 4.5% from York North riding.