List of municipalities in Ontario

Ontario is the most populous province in Canada with 14,223,942 residents as of 2021 and is third-largest in land area[a] at 892,412 km2 (344,562 sq mi).

[2] Ontario's 444 municipalities[3] cover only 17% of the province's land mass yet are home to 99% of its population.

The Municipal Act, 2001 is the legislation that enables incorporation and stipulates governance of Ontario's municipalities, excluding the City of Toronto, which is subject to the City of Toronto Act, 2006.

[10] Ontario's largest municipality by population is the City of Toronto with 2,794,356 residents, while the largest by land area is the City of Greater Sudbury at 3,186.26 km2 (1,230.22 sq mi).

[6][12] Regional governments are responsible for arterial roads, health services, policing, region-wide land use planning and development, sewer and water systems, social services, transit, and waste disposal, whereas county governments have the lesser responsibilities of arterial roads, county land use planning, health services, and social services.

The 414 local municipalities, which include 51 cities, 64 municipalities, 89 towns, 199 townships, and 11 villages, have a total population of 14,134,681, a total land area of 154,274 km2 (59,566 sq mi).

[8] Within counties, they are responsible for providing a wider range of local services since counties as upper-tier municipalities provide fewer local services than regions.