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Ontario County was the name of two historic counties in the
Canadian province Canada has ten provinces and three territories that are sub-national administrative divisions under the jurisdiction of the Constitution of Canada, Canadian Constitution. In the 1867 Canadian Confederation, three provinces of British North Amer ...
of
Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...
. Both counties were located in approximately the same area and existed on-and-off between 1792 and 1974. Their primary modern successor is the Regional Municipality of Durham, though certain parts of them were transferred to other surrounding regions.


Ontario County (1792–1800)

The original Ontario County, located in the Midland District, was constituted in 1792 as an
electoral district An electoral (congressional, legislative, etc.) district, sometimes called a constituency, riding, or ward, is a geographical portion of a political unit, such as a country, state or province, city, or administrative region, created to provi ...
for the new
Legislative Assembly of Upper Canada The Legislative Assembly of Upper Canada was the elected part of the legislature for the province of Upper Canada, functioning as the lower house in the Parliament of Upper Canada. Its legislative power was subject to veto by the appointed Li ...
: In 1798, the
Parliament of Upper Canada The Parliament of Upper Canada was the legislature for Upper Canada. It was created when the old Province of Quebec was split into Upper Canada and Lower Canada by the Constitutional Act of 1791. As in other Westminster-style legislatures, it ...
dissolved the county, and redistributed its territory to the following electoral counties and townships, effective at the beginning of 1800:


Ontario County (1852–1974)

On January 1, 1852, the old County of York was divided into three counties (York, Ontario and Peel); however they remained united. On January 1, 1854, Ontario County separated and became its own independent county, with the support of Peter Perry of
Whitby Whitby is a seaside town, port and civil parish in North Yorkshire, England. It is on the Yorkshire Coast at the mouth of the River Esk, North Yorkshire, River Esk and has a maritime, mineral and tourist economy. From the Middle Ages, Whitby ...
. The population in 1854 was 30,000 and the first County Warden was Thomas N. Gibbs. It was replaced by the Regional Municipality of Durham effective January 1, 1974.


Original townships

* Brock, area Surveyed in 1817. Community centres: Cannington, Vroomanton, Pinedale, Sunderland, Wick. * Mara, area . Surveyed in part in 1820; the survey was completed in 1836. The Township might have been named in honour of Gertrud Elisabeth Mara, or for the Spanish word for sea. Community centres were: Gamebridge, Brechin, Atherley, Udney and Rathburn. * Pickering, area . Opened in 1792 and first called Edinburgh it was renamed after the English town in Yorkshire. Community centres: Pickering, Dunbarton, Green River, Balsam, Claremont, Brougham, Altona. *
Rama Rama (; , , ) is a major deity in Hinduism. He is worshipped as the seventh and one of the most popular avatars of Vishnu. In Rama-centric Hindu traditions, he is considered the Supreme Being. Also considered as the ideal man (''maryāda' ...
, area . Opened in 1820. Rama is the Spanish name for the branch of a tree. Surveyed in 1834 and 1855. The area was first settled by retired British officers, but they ran into difficulties with the Bank of Upper Canada. The Bank sold the land to the
Indian Department The Indian Department was established in 1755 to oversee relations between the British Empire and the First Nations of North America. The imperial government ceded control of the Indian Department to the Province of Canada in 1860, thus setting ...
and the
Ojibwe The Ojibwe (; Ojibwe writing systems#Ojibwe syllabics, syll.: ᐅᒋᐺ; plural: ''Ojibweg'' ᐅᒋᐺᒃ) are an Anishinaabe people whose homeland (''Ojibwewaki'' ᐅᒋᐺᐘᑭ) covers much of the Great Lakes region and the Great Plains, n ...
First Nations First nations are indigenous settlers or bands. First Nations, first nations, or first peoples may also refer to: Indigenous groups *List of Indigenous peoples *First Nations in Canada, Indigenous peoples of Canada who are neither Inuit nor Mé ...
at Orillia were removed to a village built for them in 1838. Community centres: Floral Park, Longford Mills, Cooper's Falls, Washago. * Reach area Opened in 1809 and named after the village in Bedfordshire, England. Community centres: Port Perry, Manchester, Saintfield, Utica. * Scott area . Opened in 1820. Believed to be named after Thomas Scott, Chief Justice of Upper Canada from 1806 to 1816. Community centres: Zephyr, Sandford, Leaskdale, Udora. * Thorah, area Opened in 1820 and named form the Hebrew word signifying the inspired Law, the Pentateuch. Community centres: Beaverton. *
Uxbridge Uxbridge () is a suburban town in west London, England, and the administrative headquarters of the London Borough of Hillingdon, northwest of Charing Cross. Uxbridge formed part of the parish of Hillingdon in the county of Middlesex. As part ...
, area Opened in 1798 and named after the English town. Early settlers included Pennsylvania Quakers. New Yorkers settled in 1806. Community Centres: Uxbridge, Goodwood. *
Whitby Whitby is a seaside town, port and civil parish in North Yorkshire, England. It is on the Yorkshire Coast at the mouth of the River Esk, North Yorkshire, River Esk and has a maritime, mineral and tourist economy. From the Middle Ages, Whitby ...
, Area . Opened in 1792 and named for an English seaport. Community centres: Oshawa, Whitby, Brooklin, Ashburn and Myrtle. The Town of
Oshawa Oshawa is a city in Ontario, Canada, on the Lake Ontario shoreline. It lies in Southern Ontario, approximately east of downtown Toronto. It is commonly viewed as the eastern anchor of the Greater Toronto Area and of the Golden Horseshoe. It ...
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 Port Perry is a community located in Scugog, Ontario, Canada. The town is located northeast of central Toronto, north of Oshawa, and east of Whitby, Ontario, Whitby. Port Perry has a population of 9,553 as of 2021. Port Perry serves as the admi ...
in 1871,
Uxbridge Uxbridge () is a suburban town in west London, England, and the administrative headquarters of the London Borough of Hillingdon, northwest of Charing Cross. Uxbridge formed part of the parish of Hillingdon in the county of Middlesex. As part ...
in 1872, Cannington in 1878 and Beaverton in 1884. In the 20th century, the wartime town of
Ajax Ajax may refer to: Greek mythology and tragedy * Ajax the Great, a Greek mythological hero, son of King Telamon and Periboea * Ajax the Lesser, a Greek mythological hero, son of Oileus, the king of Locris * Ajax (play), ''Ajax'' (play), by the an ...
, 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. On January 1, 1974, the portion of Ontario County south of the Trent–Severn Waterway and about half of adjacent Durham County were amalgamated as the Regional Municipality of Durham. The remaining portions of Durham County were transferred to other neighbouring counties, and the portion of Ontario County north of the Trent–Severn Waterway (Rama and Mara Townships) was transferred to
Simcoe County Simcoe County is a county and census division located in the central region of Ontario, Canada. The county is located north of the Greater Toronto Area, and forms the north western edge of the Golden Horseshoe. The county seat is located in Mi ...
. In addition, the part of Pickering Township west of the Rouge River ( West Rouge and Port Union) was transferred to the
Borough of Scarborough The Borough of Scarborough () was a non-metropolitan district with borough status in North Yorkshire, England. In addition to the town of Scarborough, it covered a large stretch of the coast of Yorkshire, including Whitby and Filey. It bordere ...
in the Municipality of
Metropolitan Toronto The Municipality of Metropolitan Toronto was an upper-tier level of municipal government in Ontario, Canada, from 1953 to 1998. It was made up of the old city of Toronto and numerous townships, towns and villages that surrounded Toronto, whic ...
. At this time Ontario and Durham counties were dissolved. Whitby served as the "County Town" or county seat and as such was the location for the county offices, courthouse and land registry office. It continues in this role for Durham Region today.


See also

* List of census divisions of Ontario *
List of townships in Ontario This is a list of township (Canada), townships in the Provinces and territories of Canada, Canadian province of Ontario. Townships are listed by List of census divisions of Ontario, census division. Northern Ontario Northeastern Ontario Algoma D ...


References

* ''Province of Ontario -- A History 1615 to 1927'' by Jesse Edgar Middleton & Fred Landon, copyright 1927, Dominion Publishing Company, Toronto


External links


History Book: "County of Ontario" by John Edwin Chandler Farewellhttp://www.archives.gov.on.ca/english/on-line-exhibits/maps/counties/ontario.aspx (snapshot from archive.org)
{{coord, 44, 15, N, 79, 00, W, region:CA_type:adm2nd_source:GNS-enwiki, display=title Former counties in Ontario 1800 disestablishments in Canada 1852 establishments in Canada West 1974 disestablishments in Ontario Populated places disestablished in 1974 States and territories established in 1792 History of the Regional Municipality of Durham