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Ontario Research

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Algoma District: Algoma District Wills - Land Records Office and Surrogate Court; Algoma GenWeb; Algoma links
Brant County (1852-): split into the single-tier 'county' of Brant and the city of Brantford
Brant County, Ontario Canada Biographical Sketches; A Glimpse of the Past, Brant County
Bruce County (1867-): The history of the County of Bruce and of the minor municipalities therein, province of Ontario
Carleton County (1800-): became the Regional Municipality of Ottawa-Carleton, now the City of Ottawa, a single-tier municipality
Dufferin County (1881-)
Dundas County (1792-1850): merged with Stormont (1792-1850) and Glengarry (1792-1850) Counties to form Stormont, Dundas and Glengarry United Counties
Durham County (1792-1974) portions merged with Ontario County to form Durham Regional
Elgin County (1851-): was part of Middlesex County from 1837 to 1851. Prior to that, Elgin was part of the London District. In 1851 legislation was passed to separate Middlesex and Elgin Counties.; Elgin County Public Library - Local History and Genealogy - Surrogate Court Records; Elgin County, Ontario Newspaper Birth Marriages and Deaths
Essex County (1792-): Essex and Kent County Transcripts
Frontenac County (1792-): was abolished and replaced with the Frontenac Management Unit. Informally, the area is still known as Frontenac County, even though it isn't officially one.
Grey County (1852-): Ontario GenWeb Grey County
Haldimand County (1800-1974; 2001--): was merged into the Regional Municipality of Haldimand-Norfolk for many years, but this was divided again with some minor adjustments to the old lines in 2001; it is now a single-tier municipality, not an official county
Haliburton County (1874-)
Halton County (1816-1973): became Halton Regional Municipality; Cemeteries of Halton County, Ontario, Canada - Cemetery Records - Genealogy - Genology
Halinet - Halton Information Network members; E Flamborough Twp; Waterdown-East Flamborough Heritage Society Home Page; The Cork House - About the house
Hastings County (1792-)
Huron County (1849-)
Kent County (1792-1998) became the single-tier Municipality of Chatham-Kent: Genealogical Resources - Chatham Public Library - 16 April 1998
Lambton County (1852-)
Lanark County (1851-)
Leeds County (1792-1850): merged with Grenville County (1792-1850) to form Leeds and Grenville United Counties
Lennox County (1792-1864): merged with Addington County (1792-1864) to form Lennox and Addington County
Lincoln County (1792-1970): merged with Welland County to form Niagara Regional Municipality; Cemetery Records for Welland and Lincoln Counties; Grimsby Baptisms and Marriages; The Grimsby Historical Society; Search Local History
Middlesex County: In 1851 legislation was passed to separate Middlesex and Elgin Counties.
: Glencoe & District Historical Society Among the primary objectives of the society are the promotion of local history, genealogy, and the preservation of historical documents.
Norfolk County (1792-1974): was merged into the Regional Municipality of Haldimand-Norfolk for many years, but this was divided again with some minor adjustments to the old lines in 2001; it is now a single-tier municipality, not an official county
Northumberland County (1772-)
Ontario County: originally existed from 1792 to 1800, and was split with the eastern portion joining Frontenac County and the western portion joining Addington County. The second existed from 1852 to 1974, and merged with portions of Durham County to form Durham Regional Municipality. A small portion became part of Simcoe County.
Oxford County (1850 -): Cemeteries in the County of Oxford; Oxford Co Land Patents; Oxford County Library - Ingersoll Ontario; Oxford County Library - Ingersoll
Peel County (1851-1973) became Peel Regional Municipality: ONTPEEL; Peel County; Peel Links; Region of Peel - Region of Peel Archives
Perth County (1850-)
Peterborough County (1850-): Peterborough Centennial Museum and Archives
Prescott County (1800-1820): merged with Russell County (1800-1820) to form Prescott and Russell United Counties
Prince Edward County (1792-): has retained its name, but is now a single-tier municipality, not an official county
Renfrew County (1851-)

Simcoe County (1843-)

Suffolk County (1792-1800): formed in 1792 with Ontario County, in 1800 it was split into the Counties of Kent and Middlesex. During its short existence it was made up of Delaware Township, Westminster Township, most of North Dorchester Township and the rest Indian land.
Victoria County (1821-2001): became the City of Kawartha Lakes, a single-tier municipality
Waterloo County (1853-1973): became Waterloo Regional Municipality in 1973
Welland County (1851-1970): merged with Lincoln County to form Niagara Regional Municipality; The Welland Public Library Local History Site; Niagara Falls - Digital Collections; Niagara Falls tombstone search
Wellington County (1840-): Erin Township, Wellington Co., Ontario Records; Wellington County Methodists 1825-1925; Wellington County Museum and Archives; Wellington County residents in 1867.; Wellington County, Ontario GenWeb Project
Wentworth County (1816-1970): became Hamilton-Wentworth Regional Municipality, now the City of Hamilton, a single-tier municipality.; Wentworth County Genealogy Source Page; White Brick Cemetery - Ancaster Township, Wentworth County, Ontario; Saltfleet; Ancaster's Heritage Table of Contents; Saltfleet Township; Mt. Albion Cemetery - B Surnames
York County (1792-1971): saw Metropolitan Toronto (now the City of Toronto) separate from it in 1953, and the remainder became York Regional Municipality in 1971
page 3 of Gore District