List of cities in Ontario

A city is a subtype of municipalities in the Canadian Province of Ontario. A city can have the municipal status of either a single-tier or lower-tier municipality.

Ontario has 51 cities that had a cumulative population of 9,293,031 and an average population of 182,216 in the 2011 Census. Ontario's largest and smallest cities are Toronto and Dryden with populations of 2,615,060 and 7,617 respectively.

Ontario's newest city is Markham, which changed from a town to a city on July 1, 2012.

Under the former Municipal Act, 1990, a city was both an urban and a local municipality. Under this former legislation, the Municipal Board could change the status of a village or town to a city, upon review of an application from the village or town, if it had a population of 15,000 or more. The Municipal Board could also incorporate a township as a city under the same conditions with the exception that the population requirements was 25,000 or more. In the event an application was received from a village, town or township located within a county, the application could have only been approved by the Municipal Board if authorized by the Minister of Municipal Affairs.

In the transition to the Municipal Act, 2001, these requirements were abandoned and, as at December 31, 2002, every city that:

The current legislation also provides lower and single-tier municipalities with the authority to name themselves as "cities", or other former municipal status types such as "towns", "villages" or "townships", or generically as "municipalities".

Toronto is Ontario's capital and largest city and Canada's largest city

Ottawa is Canada's capital and Ontario's second largest city

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