Ontario Genealogical Society

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OGS Branches

Below is a list of the OGS Branches with links to their websites.

Many branches serve more than one county, so the Branch may not have the county name that you're searching for in its name.
The Ontario Locator can help you can find what Branch a historical county, city, or district belongs to.
To find locations not on the Ontario Locator, you can try the Querying Geographical Names of Canada search service from Natural Resources Canada.

OGS Branches and SIG

Brant County (Region IV)
Bruce & Grey County (Region III)
Durham Region (Region VII)
Elgin County (Region II)
Essex County (Region I)
Haldimand County (Region IV)
Halton-Peel (Region V)
Hamilton (Wentworth County) (Region IV)
Huron County (Region III)
Ireland - SIG
Irish Palatine - SIG
Kawartha (Haliburton, Peterborough, Northumberland and Victoria Counties) (Region VII)
Kent County (Region I)
Kingston (Frontenac, Lennox and Addington Counties) (Region VIII)
Lambton County (Region I)
Leeds & Grenville (Region VIII)
London & Middlesex County (Region II)
Niagara Peninsula (Lincoln and Welland Counties) (Region IV)

Nipissing District (Nipissing, Parry Sound & Temiskaming Districts) (Region IX)
Norfolk County (Region IV)
Ottawa (Carleton, Lanark, Renfrew, Russell [Russell-Prescott] Counties) (Region VIII)
Oxford County (Region II)
Perth County (Region III)
Quinte (Prince Edward, Hastings & part of Northumberland Counties) (Region VII)
Sault Ste. Marie & District of Algoma (Region X)
Simcoe County (Region V)
Sudbury District (Region IX)
Thunder Bay (Districts of Thunder Bay, Kenora & Rainy River) (Region XI)
Toronto (Region V)
Waterloo Region (Region III)
Wellington County (Region III)
York Region (former York County excluding Toronto) (Region V)

Founded in 1961 to encourage, bring together and assist all
those interested in the pursuit of family history.