Ontario County, Ontario
| Ontario County | |
|---|---|
| County | |
| Coordinates: 43°55′N 78°56′W / 43.917°N 78.933°W | |
| Established | 1792 |
| Time zone | Eastern (EST) (UTC-5) |
| • Summer (DST) | Eastern (EDT) (UTC-4) |
| Ontario County | |
|---|---|
| County | |
| Coordinates: 43°55′N 78°56′W / 43.917°N 78.933°W | |
| Province |
 OntarioCanada West (1852-1867) |
| Established | 1852 |
| Seat | Whitby |
| Time zone | Eastern (EST) (UTC-5) |
| • Summer (DST) | Eastern (EDT) (UTC-4) |
Ontario County was the name of two historic counties in the Canadian province of Ontario.
The original Ontario County existed from 1792 to 1800 as part of the Eastern District, and consisted of the islands in the St. Lawrence River. After 1800, Ontario County was dissolved and the islands were reassigned to the nearest mainland counties:
The second Ontario County (area 514,031 acres (2,080 km2)) was created in 1852 from the East Riding of York County. It was replaced by Regional Municipality of Durham effective January 1, 1974.
The Town of Oshawa was also located in the county.
In 1855 the Town of Whitby was incorporated in part of Whitby Township. Scugog Township was formed from a portion of Reach Township and Cartwright Township in adjoining Northumberland and Durham County in 1856. And in 1858, the Township of East Whitby was formed from the eastern portion of Whitby Township.
A number of villages were also incorporated as separate municipalities in the county after it was created: Port Perry in 1871, Uxbridge in 1872, Cannington in 1878 and Beaverton in 1884. In the twentieth-century, the wartime town of Ajax, located in Pickering Township, was incorporated as an improvement district in 1950. It became a town in 1955. The Village of Pickering was incorporated as a village in 1953.
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