York County, Ontario

York County, Ontario
Dissolved County
Nickname(s): York County
York County c.1880s
Country	Canada
Province	Ontario
Incorporated	1792 created from parts of Home District
Dissolved	1971 - Regional Municipality of York
County seat Administrative seat	York, Upper Canada 1792-1834 Toronto 1834-1953 Newmarket, Ontario 1953-1971
Area
• Total	2,392.17 km² (923.62 sq mi)
Time zone	Eastern (EST) (UTC-5)

York County is a historic county in Upper Canada, Canada West, and the Canadian province of Ontario.

York County was created on 16 June 1792 and was part of the jurisdiction of the Home District of Upper Canada. It originally comprised all of what is now the regional municipalities of York, Peel, and Halton, and the city of Toronto, as well as parts of Durham Regional Municipality and the city of Hamilton. Toronto was the county seat.

In 1816, Wentworth and Halton counties were created from York County. In 1851, Ontario and Peel counties were separated from York.

In 1953, the city of Toronto; the towns of New Toronto, Mimico, Weston, and Leaside; the villages of Long Branch, Swansea, and Forest Hill; and the townships of Etobicoke, York, North York, East York, and Scarborough seceded from York County to form Metropolitan Toronto. The county office was moved to Newmarket from Toronto. The Adelaide Street Court House and the Old City Hall remain from buildings used by York County during this time period.