York North was a federal riding in Ontario, Canada, represented in the House of Commons of Canada in all thirty-seven parliaments from Confederation in 1867 until 2004. Its elimination in 2004 left Simcoe North as the only federal electoral district in Ontario to have been in continual existence since Canadian Confederation. Remarkably, York North's provincial counterpart similarly maintained continuous representation in the Legislative Assembly of Ontario in all thirty-eight Ontario parliaments between Confederation and 2007, and was the only provincial district to have maintained its continual existence after 1999.
York North was abolished by the 2003 redistribution process, and ceased to be in existence upon the dissolution of the 37th Parliament in May 2004. Its territory was redistributed to the new ridings of Newmarket—Aurora, Oak Ridges—Markham (only a small portion), and to the resurrected York—Simcoe (the vast rural portion), the riding previously replaced by York North in 1996. Its provincial counterpart was similarly abolished upon the dissolution of the 38th Ontario Parliament in June 2007.
The electoral district held a unique distinction for having two candidates from a single election declared elected, seated in parliament and unseated by court ruling before the term was over. Prior to the Supreme Court of Canada's February 2026 decision that invalidated the 1-vote election victory in Terreborne in the 2025 federal election, the ordeal stemming from York North's election in 1988 was the most recent federal contest to have been overturned for reasons other than a recount.
It was also among a small group of electoral districts that had been represented by a sitting prime minister, and even more still it is among just a small handful that had dealt its prime ministerial MP a local defeat.
While its final incarnation consisted mostly of the more rural area that lied actually in the northern portion of York Region, York North covered an collection of communities in the southern end of the region that are now commonly considered northern suburbs of the city of Toronto through much of the later half of the twenty century, such as Vaughan, Richmond Hill, Woodbridge, Stouffville and Markham. Its territory even reached into the modern City of Toronto for two periods, with a portion of the former township of North York being part of the riding in four general elections.
Evolution of the riding
At Canadian Confederation, the British North America Act, 1867 specified the eight-two electoral districts to be contested for electing the first group of legislator to both the House of Commons and the provincial legislature. By virtue of the size of its population, the County of York was allocated three seats, one of four counties to have the right to elected three members. Its original boundary was however not defined by the BNA, which simply prescribed that the County of York 's three existing electoral districts from the pre-confederation colonial legislature, the Legislative Assembly of the Province of Canada, would continue. The three York electoral districts were previously defined in 1853 (which actually removed one of York's four ridings to create the new district of Peel), with York North covering the Township of King, Whitchurch, Georgina, East Gwillimbury and North Gwillimbury and the associated villages of Aurora, Newmarket and Holland Landing. It was were represented in the fifth to the eighth parliaments of the Province of Canada.
The County of York, and its successor York Region, as the entity initially surrounding and later abutting the fast growing City of Toronto, had over the years saw both its jurisdictional boundary and the electoral boundary of its districts shift in response to the rapid growth of population in Toronto and its surrounding suburbs. Many of the changes could also be attributed to the many piecemeal annexations by not just the City of Toronto but other municipal entities as they grew from villages into major population centres, though they do not explain all the wild fluctuation of its boundary or explain why "North" was used to describe its territory in some period. Except for once instances, it have however kept its territory north of what is now the City of Toronto.
In 1882, the riding was redefined to consist of the townships of King, East Gwillimbury, West Gwillimbury, North Gwillimbury and Georgina, and the villages of Holland Landing, Bradford and Aurora.
In 1903, the north riding was redefined to consist of the townships of Georgina, East Gwillimbury, North Gwillimbury, King, and Whitchurch, the towns of Aurora and Newmarket, and the villages of Holland Landing, Stouffville and Sutton.
In 1924, York North was defined as consisting of all that part of the county of York north of the southerly boundary of the townships of Vaughan and Markham. This was the first instance the riding reach as far south as the northern border of modern-day Toronto (though the concept of Metropolitan Toronto did not emerge until after the war). The riding boundary continue to reach that far south west of Yonge, but receded back east of Yonge in 1933 as it Markham and Stouffville were given to York East.
In 1947, it was redefined to consist of that part of the county of York lying north of the line being the southerly boundary of the township of North York, Yonge Street and the southerly boundary of the township of Markham.
In 1952, it was defined as consisting of that part of the county of York lying north of Highway 7, excluding the town of Woodbridge.
In 1966, it was defined as consisting of a north-central section of the Borough of North York in Metropolitan Toronto, the Town of Richmond Hill, the Township of Markham excluding the Village of Stouffville, and part of the Township of Vaughan. Twelve years prior to this redistribution, with the creation of the Municipality of Metropolitan Toronto in 1954 area south of Steeles Ave ceased to be part of York County. Markham, Vaughan and Richmond Hill were accordingly the three southernmost municipalities in York County at this time, the electoral district name York North was thus highly misleading for the redistributed district. It was however available, as the northern portion of the Country were distributed to join the southern portion of Simcoe County to form York–Simcoe, while the names York Centre, South, West and East were all in use by electoral districts within Metropolitan Toronto. While objection to the inclusion of a slice of Toronto was raised by former cabinet minister Dick Bell, as part of his extensive critique of the report by the Ontario boundaries commission that year, no objection to the naming of "York North" for an electoral district covering southern York was recorded from either local MP John Addison or other MPs.
In 1976, it was redefined to consist of the Towns of Markham, Richmond Hill and Vaughan in the Regional Municipality of York. In 1987, it was redefined to consist of the towns of Aurora, Richmond Hill and Vaughan, and the southern part of the Township of King.
In the 1996 redistribution, the misnomer of York North as a district covering southern York Region was corrected in a most abrupt manner. Most of the incumbent district became Vaughan—King—Aurora, with substantial portions redistributed to the electoral districts Oak Ridges and Thornhill. With its territory distributed to three newly created district, the historic name "York North" was redeployed to its traditional role of covering the northern portion of York: Newmarket, East Gwillimbury, Georgina, as well as the part of King north of Side Road 18. While its new territory was much better suited for the name, the pre-redistributed and post-redistributed electoral districts of York North had virtually no overlap. The name was simply freed up and slapped onto territory it ceased covering thirty years prior.
This final reincarnation of York North was contested in two federal elections. The electoral district was abolished in 2003, with vast majority redistributed between the new electoral district of Newmarket—Aurora and the resurrected York—Simcoe, making up more than half of each, and a tiny remainder portion to Oak Ridges—Markham.
Two breaches into Toronto Despite the word North in its name reinforcing its association with the more rural area in the northern portion of York Region near Lake Simcoe, the electoral district not only covered much of the southernmost portion of York Region for extended periods, but had actually reach into the areas within the provincial capital's modern day boundary on two occasions.
In 1947, the electoral district of York South was drastically reduced in size to cover a concentrated area consisted of the village of Forest Hill and the area later known as Weston and the Borough of York. The territory it shredded was transferred to its northern sibling York North, shifting York North's southern boundary to the southerly boundary of the township of North York west of Yonge Street. With the western half of the Township of North York now a constituent component, York North did not merely stray pass the border of modern Toronto and picked up a few small villages. Its reached deep into an area of rapid urbanization within Metropolitan Toronto. The resulting riding literally span from the old City of Toronto border (as it was then) all the way to Lake Simcoe. Even in its contemporary context, the southern shift was unusual, though not sufficiently so to be contentious, as it merely followed the precedent of its provincial counterpart. The electoral boundaries of the provincial electoral districts of York North and York South were redrawn in the same manner fourteen years earlier. The identically drawn provincial York North riding had held five general elections by that point and had elected MPPs from all three parties by the time the federal boundary shifted. The federal riding however only held one election, in 1949, with territory inside modern day Toronto. In 1952, a brand new district named York Centre was created, resulting in York North's southern boundary receding back north to Highway 7 ahead of the 1953 federal election. While York North would venture into Toronto again, this was the only instance for York North to be actually immediately adjacent to City of Toronto in its contemporary definition, touching the city's then border in the area that was once the town of North Toronto.
It did not take long before York North reach into modern Toronto again. In 1966, York North took in the Newtonbrook neighborhood of North York, an area immediately south of Markham and fair distance from the actual city. It was designated for development of housing for the accommodation of decommissioned soldiers after the war. It the same redistribution, York North lost all of its northern territory around Lake Simcoe and was left with Markham, Richmond Hill and Vaughan, ironically the three southernmost towns in York Region after North York became part of Metropolitan Toronto. York North was contested three times in this incarnation.
A rare BNA original Despite the wild fluctuation of its territory both federally and provincially, York North was the only electoral district prescribed by the BNA Act that had maintained presence without interruption both federally and provincial for such an extended period, respectively over thirty-seven and thirty-eight parliaments.