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Ontario GenWeb Project: Ontario County
Research By Area
Ontario County
This area of Ontario is covered by Ontario County GenWeb. The information presented below is merely an outline of the county and does not include what is available for genealogical research for this area. For information on genealogical research of this area please visit Ontario County GenWeb.

Ontario County was established in 1849 from York County but was not separate from York until 1853.

The county was dissolved in 1974 and "incorporated into Metropolitan Toronto, the Regional Municipality of Durham and the county of Simcoe on January 1, 1974."3

"Population 29,571 in 1852 and 135,895 in 1966."3

Ontario County was located in South-Western Ontario.

  • Prior to 1853 - part of York County
  • 1974-present - Part of the Regional Municipality of Durham, Metropolitan Toronto, and Simcoe County


    Related Material

  • More maps of this area
  • Surnames
  • Place Names
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    1 Lovell's Gazetteer of British North America 1873
    3 Place Names of Ontario by Floreen Carter, 1984
    5 Place Names of Ontario by Alan Rayburn, 1997

  • Upper Canada [Est. 1791]
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    Canada West [Est. 1841]
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    Ontario [Est. 1867]
    Addington County [Est. 1792]
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    Algoma District [Est. 1858]
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    Bathurst District [Est. 1824]
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    Bothwell District [Est. 1867]
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    Brant County [Est. 1852]
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    Brock District [Est. 1837]
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    Bruce County [Est. 1849]
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    Cardwell District [Est. 1867]
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    Carleton County [Est. 1800]
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    Cochrane District [Est. 1922]
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    Colborne District [Est. 1841]
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    Dalhousie District [Est. 1838]
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    District of Keewatin [Est. 1876]
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    Dufferin County [Est. 1881]
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    Dundas County [Est. 1792]
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    Durham County [Est. 1792]
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    Eastern District [Est. 1792]
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    Elgin County [Est. 1852]
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    Essex County [Est. 1792]
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    Frontenac County [Est. 1792]
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    Glengarry County [Est. 1792]
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    Gore District [Est. 1816]
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    Grenville County [Est. 1792]
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    Grey County [Est. 1852]
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    Haldimand County [Est. 1800]
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    Haliburton County [Est. 1874]
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    Halton County [Est. 1816]
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    Hastings County [Est. 1792]
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    Hesse District [Est. 1788]
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    Home District [Est. 1792]
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    Huron County [Est. 1842]
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    Huron District [Est. 1842]
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    Johnstown District [Est. 1798]
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    Kenora District [Est. 1907]
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    Kent County [Est. 1792]
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    Lambton County [Est. 1850]
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    Lanark County [Est. 1824]
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    Leeds County [Est. 1792]
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    Lennox & Addington County [Est. 1800]
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    Lennox County [Est. 1792]
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    Lincoln County [Est. 1792]
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    London District [Est. 1800]
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    Lunenburg District [Est. 1788]
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    Manitoulin District [Est. 1888]
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    Mecklenburgh District [Est. 1788]
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    Middlesex County [Est. 1800]
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    Midland District [Est. 1792]
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    Monck County [Est. 1867]
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    Muskoka District [Est. 1868]
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    Nassau District [Est. 1788]
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    Newcastle District [Est. 1802]
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    Niagara District [Est. 1800]
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    Nipissing District [Est. 1858]
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    Norfolk County [Est. 1792]
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    Northumberland County [Est. 1792]
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    Ontario County [Est. 1849]
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    Ontario County (#1) [Est. 1792]
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    Ottawa District [Est. 1816]
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    Oxford County [Est. 1800]
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    Parry Sound District [Est. 1869]
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    Peel County [Est. 1852]
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    Perth County [Est. 1850]
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    Peterborough County [Est. 1838]
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    Prescott County [Est. 1800]
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    Prince Edward County [Est. 1792]
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    Prince Edward District [Est. 1831]
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    Rainy River District [Est. 1885]
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    Renfrew County [Est. 1838]
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    Rupert's Land
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    Russell County [Est. 1800]
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    Simcoe County [Est. 1798]
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    Simcoe District [Est. 1837]
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    Stormont County [Est. 1792]
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    Sudbury District [Est. 1894]
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    Suffolk County [Est. 1792]
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    Talbot District [Est. 1837]
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    Thunder Bay District [Est. 1871]
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    Timiskaming District [Est. 1912]
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    Victoria County [Est. 1852]
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    Victoria District [Est. 1837]
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    Waterloo County [Est. 1838]
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    Welland County [Est. 1845]
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    Wellington County [Est. 1852]
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    Wellington District [Est. 1837]
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    Wentworth County [Est. 1816]
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    Western District [Est. 1792]
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    York County [Est. 1792]

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