Ontario Counties

Under Ontario law, counties and regions are considered upper-tier municipalities. Historically, Regions provided police services and Counties did not. That holds today, even though under provincial law, the names have no meaning. In northern Ontario, there are Districts that provide no municipal services and all municipalities organized within those districts are single-tier. Municipalities listed here are upper-tier except has noted.

• County of Brant - Single-tier municipality
• Bruce County (ON)
• Municipality of Chatham-Kent - Single-tier municipality
• Cochrane District County (ON)
• Dufferin County (ON)
• Durham County (ON)
• Elgin County (ON)
• Essex County (ON)
• Frontenac County (ON)
• Grey County (ON)
• City of Guelph - Single-tier municipality
• Haldimand County (ON)
• Haliburton County (ON)
• Halton Region
• City of Hamilton - Single-tier municipality (Not to be confused with Hamilton Twp in Northumberland County)
• Hastings County (ON)
• Huron County (ON)
• Kawartha Lakes County (ON)
• Kenora District County (ON)
• Lambton County (ON)
• Lanark County (ON)
• Leeds and Grenville County (ON)
• Lennox and Addington County (ON)
• Manitoulin District County (ON)
• Middlesex County (ON)
• District Municipality of Muskoka
• Niagara Region
• Nipissing District County (ON)
• Norfolk County (ON)
• Northumberland County (ON)
• City of Ottawa - Single-tier municipality
• Oxford County (ON)
• Parry Sound District County (ON)
• Peel Region
• Perth County (ON)
• Peterborough County (ON)
• Prescott and Russell, United Counties of
• Prince Edward County (ON)
• Rainy River District County (ON)
• Renfrew County (ON)
• Simcoe County (ON)
• Stormont, Dundas, and Glengarry, United Counties of
• Sudbury District County (ON)
• Thunder Bay District County (ON)
• Timiskaming District County (ON)
• City of Toronto - Single-tier municipality
• Waterloo Region
• Wellington County (ON)
• York Region