Cities in Ontario

Ottawa (, ; ) is the capital city of Canada. It is located in the southern portion of the province of Ontario, at the confluence of the Ottawa River and the Rideau River. Ottawa borders Gatineau, Quebec, and forms the core of the Ottawa–Gatineau census metropolitan area (CMA) and the National Capital Region (NCR). Ottawa had a city population of 1,017,449 and a metropolitan population of 1,488,307, making it the fourth-largest city and fourth-largest metropolitan area in Canada.

Toronto is the most populous city in Canada and the capital city of the Canadian province of Ontario. With a 2021 Census population of 2,794,356, the city is the fourth-most populous city in North America. Toronto is the anchor of the Golden Horseshoe, an urban agglomeration surrounding the western end of Lake Ontario with an estimated population of 11,198,136 in 2025. As of 2025, the Toronto census metropolitan area had an estimated population of 7,106,379. Toronto is an international centre of business, finance, arts, sports, and culture, and is recognized as one of the most multicultural an

city in Ontario, Canada

city in Southwestern Ontario, Canada

city in Essex County, Ontario, Canada

city in Ontario, Canada

Brampton is a city in the Canadian province of Ontario, and the regional seat of the Regional Municipality of Peel. It is part of the Greater Toronto Area (GTA) and is a lower-tier municipality within the Peel Region. The city has a population of 656,480 as of the 2021 census, making it the ninth most populous municipality in Canada and the third most populous city in the Greater Golden Horseshoe urban area, behind Toronto and Mississauga. The City of Brampton is bordered by Vaughan to the east, Halton Hills to the west, Caledon to the north, Mississauga to the south, and Etobicoke (Toronto) t

city in Ontario, Canada

city in Thunder Bay District, province of Ontario, Canada

Oshawa is a city in Ontario, Canada, on the Lake Ontario shoreline. It lies in Southern Ontario, approximately east of downtown Toronto. It is commonly viewed as the eastern anchor of the Greater Toronto Area and of the Golden Horseshoe. It is the largest municipality in the Regional Municipality of Durham. The name Oshawa originates from the Ojibwa term , meaning "the crossing place" or just "a cross".

city located in the province of Ontario, Canada

Barrie is a city in Central Ontario, Canada, about north of Toronto. The city is located along the shores of Kempenfelt Bay and geographically within Simcoe County, although it is a single-tier municipality that is politically independent from the surrounding county.

city in Ontario, Canada

city and unitary authority in Ontario, Canada

Guelph ( ; 2021 Canadian Census population 143,740) is a city in Southwestern Ontario, Canada. Known as "The Royal City", it is roughly east of Kitchener and west of Downtown Toronto, at the intersection of Highway 6, Highway 7, and Wellington County Road 124. It is the seat of Wellington County, but is politically independent of it.

Brantford is a city in Ontario, Canada, founded on the Grand River in Southwestern Ontario. It is surrounded by Brant County but is politically separate with a municipal government of its own that is fully independent of the county's municipal government.

city in Ontario, Canada

city in the Greater Toronto Area, Ontario, Canada

Vaughan ( ) (2021 population 323,103) is a city in Ontario, Canada. It is located in the Regional Municipality of York, just north of Toronto. Vaughan was the fastest-growing municipality in Canada between 1996 and 2006 with its population increasing by 80.2% during this time period and having nearly doubled in population since 1991. In 2021, the population of Vaughan was 323,103. It is the fifth-largest city in the Greater Toronto Area, and the 17th-largest city in Canada.

city in Halton Region, Ontario, Canada

Sarnia is a city in Lambton County, Ontario, Canada. It had a 2021 population of 72,047, and is the largest city on Lake Huron. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes, where Lake Huron flows into the St. Clair River in the Southwestern Ontario region, which forms the Canada–United States border, directly across from Port Huron, Michigan.

city in Ontario, Canada

city in Ontario, Canada

city in Ontario, Canada

city in Ontario, Canada

city in the Regional Municipality of Waterloo, Ontario, Canada

Brockville is a city in Eastern Ontario, Canada, in the Thousand Islands region. Although it falls within the United Counties of Leeds and Grenville, it is politically independent of the county. It is included with Leeds and Grenville for census purposes only.

city in Ontario, Canada

Timmins ( ) is a city in northeastern Ontario, Canada, located on the Mattagami River. The city is the fourth-largest city in the Northeastern Ontario region with a population of 41,145 at the 2021 Canadian census and an estimated population of 44,819 in 2023. The city's economy is based on natural resource extraction. It is supported by industries related to lumbering, and to the mining of gold, zinc, copper, nickel, and silver. Timmins serves as a regional service and distribution centre.

city in Ontario, Canada

city in Ontario, Canada

city in Durham Region, Ontario, Canada

Welland is a city in the Regional Municipality of Niagara in Southern Ontario, Canada. As of 2021, it had a population of 55,750.

Orillia () is a city in Ontario, Canada, about 30 km (18 mi) north-east of Barrie in Simcoe County. It is located at the confluence of Lake Couchiching and Lake Simcoe. Although it is geographically located within Simcoe County, the city is a single-tier municipality. It is part of the Huronia region of Central Ontario. The population in 2021 was 33,411.

city in Ontario, Canada

Kenora (), previously named Rat Portage (), is a city situated on the Lake of the Woods in Ontario, Canada, close to the Manitoba boundary, and about east of Winnipeg by the Trans-Canada Highway. It is the seat of Kenora District.

city in Ontario, Canada

city in southwestern Ontario, Canada

city in Ontario, Canada

city in Oxford County, Ontario, Canada

city in Niagara Region, Ontario, Canada

city in Ontario, Canada

city in Ontario, Canada

municipality in Ontario, Canada

city in the Kenora District of Northwestern Ontario, Canada

city in Ontario, Canada

city in Ontario, Canada

rural municipality in Ontario, Canada

city in Ontario, Canada

Thorold is a city in Ontario, Canada, located on the Niagara Escarpment. It is also the seat of the Regional Municipality of Niagara. The Welland Canal passes through the city, featuring lock 7 and the Twin Flight Locks.

Clarence-Rockland is a city in Eastern Ontario, Canada, in the United Counties of Prescott and Russell on the Ottawa River. Clarence-Rockland, located immediately to the east of Ottawa, was formed on January 1, 1998, through the amalgamation of the Town of Rockland with Clarence Township.

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