Ontario (Wikipedia) Ontario (/ɒnˈtɛərioʊ/ on-TAIR-ee-oh; French: [ɔ̃taʁjo]) is one of the thirteen provinces and territories of Canada. Located in Central Canada, Ontario is the country’s most populous province. As of the 2021 Canadian census, it is home to 38.5 percent of the country’s population, and is the second-largest province by total area (after Quebec). Ontario is Canada’s fourth-largest jurisdiction in total area of all the Canadian provinces and territories. It is home to the nation’s capital, Ottawa, and its most populous city, Toronto, which is Ontario’s provincial capital.