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A Guide to Ontario Municipalities

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There are 444 municipalities in Ontario as of April 2019, according to the Association of Municipalities Ontario.

For maps of Ontario's municipal boundaries:

Municipal Boundaries Map

Restructuring Maps of Ontario


Definitions for Types of Municipalities

Historic Districts - These are not categorized in the Ontario Project Structure. The time period they are associated with is 1793 to 1849. They were the original unit for municipal and judicial administration in what is now Ontario. During this time period Districts were responsible for the assessment of real and personal property for taxation purposes. Local assessors reported to magistrates of the Courts of Quarter Sessions of the Peace. The magistrates were responsible for the municipal and judicial administration of the district.
Modern Districts - these are categorized as outlined below. The time period they are associated with is July 1, 1867 to Present. These districts are mostly located in what is considered Northern Ontario. They provide basic administrative services similar to Counties, however are much larger in physical size.
Regions - Also referred to as Regional Municipalities. This type of administration is similar to an upper tier municipality for urban areas.
Counties - The county system was the basis for ridings in the Legislative Assembly in Ontario. After the passage of the Baldwin Act (Canada Statutes 1849, chapter 81) they assumed the role of an upper tier municipality. Townships, villages and most other towns and cities formed part of a County.
Single-tier Municipalities - These include some cities, towns, townships and counties. They are considered separate from all other types of Municipalities. For example: A single-tier town or city is not included in the County, Region or District that it is physically part of, for administrative purposes.


A regional government is an association of local, lower level municipalities. They provide government services to their member municipalities. The current regions in Ontario and it's member municipalities are:

Durham Region

Durham Region

Halton Region

Halton Region

Niagara Region

Niagara Region

Peel Region

Peel Region

Waterloo Region

Waterloo Region

York Region

York Region


In Ontario, a county government is an association of local municipalities within its borders. Counties are often referred to as Upper Tier, with local municipalities referred to as Lower Tier. The current Counties and their associated municipalities are:

Bruce County

Bruce County, Ontario

Dufferin County

Dufferin County, Ontario

Elgin County

Elgin County, Ontario

Essex County

Essex County, Ontario

Frontenac County

Frontenac County, Ontario

Grey County

Grey County, Ontario

Haliburton County

Haliburton County, Ontario

Hastings County

Hastings County, Ontario

Huron County

Huron County, Ontario

Lambton County

Lambton County, Ontario

Lanark County

Lanark County, Ontario

Leeds and Grenville United Counties

Leeds and Grenville United Counties

Lennox and Addington County

Lennox and Addington County, Ontario

Middlesex County

Middlesex County, Ontario

Northumberland County

Northumberland County, Ontario

Oxford County

Oxford County, Ontario

Perth County

Perth County, Ontario

Peterborough County

Peterborough County, Ontario

Prescott and Russell United Counties

Prescott and Russell United Counties, Ontario

Renfrew County

Renfrew, Ontario

Simcoe County

Simcoe County, Ontario

Stormont Dundas and Glengarry County

Stormont Dundas and Glengarry County, Ontario

Wellington County

Wellington County, Ontario


In Ontario, Districts are used to describe territorial boundaries that do not serve any municipal government purpose. The exception to this rule is the District of Muskoka, Ontario which does provide services throughout the region.

As of June 19, 2019, all current Districts and their lower-tier municipalities have been updated for the Ontario Project. Bold place names have not been created.

Algoma District

Algoma District, Ontario

Cochrane District

Cochrane District, Ontario

Kenora District

Kenora District, Ontario

Manitoulin District

Manitoulin District, Ontario

Muskoka District

Muskoka District, Ontario

Nipissing District

Nipissing District, Ontario

Parry Sound District

Parry Sound District, Ontario

Rainy River District

Rainy River District, Ontario

Sudbury District

Sudbury District, Ontario

Timiskaming District

Timiskaming District, Ontario

Thunder Bay District

Thunder Bay District, Ontario

Single Tier Locations

Single-Tier municipalities exist throughout Ontario. These are municipalities that have separated from an Upper Tier municipality, as well as former county or regional municipalities that have amalgamated into a single-tier structure.

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Categories: Ontario, Places