List of Ontario counties
Below is a list of counties in the Canadian province of
Ontario. The term "county" is only used for the geographical units in the populous southern part of the province. The sub-divisions in the thinly populated northern part of the province are called districts. This list has not taken into account some recent reorganization of county boundaries.
- Algoma District, Ontario
- Brant County, Ontario
- Bruce New County, Ontario
- Chatham-Kent Municipality, Ontario
- Cochrane District, Ontario
- Dufferin County, Ontario
- Dundas County, Ontario
- Durham Regional Municipality, Ontario
- Elgin County, Ontario
- Essex County, Ontario
- Frontenac Management Unit, Ontario
- Greater Sudbury City, Ontario
- Grey County, Ontario
- Haldimand County, Ontario
- Haliburton County, Ontario
- Halton Regional Municipality, Ontario
- Hamilton City, Ontario
- Hastings County, Ontario
- Huron County, Ontario
- Kawartha Lakes City, Ontario
- Kenora District, Ontario
- Lambton County, Ontario
- Lanark County, Ontario
- Leeds and Grenville County, Ontario
- Lennox and Addington County, Ontario
- Manitoulin District, Ontario
- Middlesex County, Ontario
- Muskoka District Municipality , Ontario
- Niagara Regional Municipality, Ontario
- Nipissing District, Ontario
- Norfolk County, Ontario
- Northumberland County, Ontario
- Ottawa City, Ontario
- Oxford County, Ontario
- Parry Sound District, Ontario
- Peel Regional Municipality, Ontario
- Perth County, Ontario
- Peterborough County, Ontario
- Prescott and Russell County, Ontario
- Prince Edward County (City), Ontario
- Rainy River District, Ontario
- Renfrew County, Ontario
- Simcoe County, Ontario
- Stormont, Dundas and Glengarry County, Ontario
- Sudbury District, Ontario
- Thunder Bay District, Ontario
- Timiskaming District, Ontario
- Toronto City, Ontario
- Waterloo Regional Municipality, Ontario
- Wellington County, Ontario
- York Regional Municipality, Ontario
