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Home > Historic counties of Ontario
The Canadian province of Ontario has several historic counties, which are past census divisions that no longer exist today. Most historic counties either merged with other counties, or became regional municipalities or single-tier municipalities.- Addington County merged with Lennox County to form Lennox and Addington County
- Brant County split into the single-tier 'county' of Brant and the city of Brantford
- Carleton County became the Regional Municipality of Ottawa-Carleton, now the City of Ottawa
- Dundas County merged with Stormont and Glengarry Counties to form Stormont, Dundas and Glengarry United Counties
- Durham County merged with Ontario County to form Durham Regional MunicipalityDurham Regional Municipality also called Durham Region (2003 population 525,000), is a regional political area located east of Toronto, Ontario. It has an area of approximately 2,500 square kilometers and includes the municipalities of Pickering, Ajax, Os
- Glengarry CountyGlengarry County is a historic county in the Canadian province of Ontario. Glengarry was created in 1792. The original territory of Glengarry also included Prescott County, which became a separate county in 1800. Glengarry later merged with Stormont and D merged with Stormont and Dundas Counties to form Stormont, Dundas and Glengarry United Counties
- Grenville CountyGrenville County is a historic county in the Canadian province of Ontario. The county was created in 1792, and later merged with Leeds County to create Leeds and Grenville County. See also List of Ontario census divisions. External links Historic counties merged with Leeds County to form Leeds and Grenville United CountiesThe United Counties of Leeds and Grenville are located in Southeastern Ontario, Canada. The population, as of the 1991 census, was 96,606. The United Counties have an area of 3,390 sq km (1,309 sq mi). Leeds and Grenville front on the St. Lawrence River a
- Kent CountyKent County is a historic county in the Canadian province of Ontario. The county was created in 1792. On January 1, 1998, the county was amalgamated into the single-tier city of Chatham-Kent. See also List of Ontario census divisions. External Link Histor became the Municipality of Chatham-KentChatham-Kent often called simply Chatham is a city located in Southwestern Ontario, Canada. In 1998 the former Chatham city government merged with that of Kent County to form the city of Chatham-Kent. The 2003 population of the new city of Chatham-Kent wa
- Haldimand CountyHaldimand is a single-tier municipality (but called a county) on the Niagara Peninsula in southern Ontario, on Lake Erie, and on the Grand River. The county seat is Cayuga. The main centres in Haldimand are Jarvis, Hagersville, Caledonia, Cayuga, and Dunn was merged into the Regional Municipality of Haldimand-Norfolk for many years, but this was divided again on the old lines in 20012001 is a common year starting on Monday (see link for calendar), and also: The International Year of the Volunteer The United Nations Year of Dialogue Among Civilizations Events January January 1 A black monolith measuring approximately nine feet tall ap; it is now a standalone municipality, not an official county
- Halton County became Halton Regional Municipality
- Leeds County merged with Grenville County to form Leeds and Grenville United Counties
- Lennox County merged with Addington County to form Lennox and Addington County
- Lincoln County merged with Niagara County and Welland County to form Niagara Regional Municipality
- Norfolk County was merged into the Regional Municipality of Haldimand-Norfolk for many years, but this was divided again on the old lines in 2001; it is now a standalone municipality, not an official county
- Ontario County merged with Durham County to form Durham Regional Municipality
- Peel County became Peel Regional Municipality
- Prescott County merged with Russell County to form Prescott and Russell United Counties
- Prince Edward County has retained its name, but is now a standalone municipality, not an official county
- Russell County merged with Prescott County to form Prescott and Russell United Counties
- Stormont County merged with Dundas and Glengarry Counties to form Stormont, Dundas and Glengarry United Counties
- Victoria County became the City of Kawartha Lakes
- Welland County merged with Niagara County and Lincoln County to form Niagara Regional Municipality
- Waterloo County became Waterloo Regional Municipality
- Wentworth County became Hamilton-Wentworth Regional Municipality, now the City of Hamilton
- York County split to become Metropolitan Toronto (now the City of Toronto), and York Regional Municipality
Ontario also has four historic counties which appeared in some census enumerations and as electoral ridings, but never existed as separate political entities:
- Bothwell County was made up of townships from Kent and Lambton counties.
- Cardwell County was made up of townships from Simcoe and Peel counties.
- Monck County was made up of townships from Lincoln, Haldimand, and Welland Counties.
- Niagara County was made up of townships from Lincoln County.
The Regional Municipality of Sudbury can be considered 'historic', as it later became the City of Greater Sudbury; however, its origins are not in county government, but as a part of the still-extant Sudbury District.
See also List of Ontario census divisions.
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