Final answer:
One third of Canadians live in Ontario, which is the most populous province and hosts approximately 39 percent of the country's population.
Step-by-step explanation:
One third of all Canadians live in the province of Ontario. Ontario is the most populous province in Canada, with about 39 percent of the country's total population. It is often referred to as South Canada because it's located at the southern part of the country and has the largest concentration of residents. This area is particularly attractive due to its economic opportunities, proximity to the United States, and physical geography, which includes the fertile land along the Great Lakes and the St. Lawrence River.