Mississauga is a city in the Canadian province of Ontario and a suburb of Toronto. It is situated on the shores of Lake Ontario in the Regional Municipality of Peel, bordering Toronto. With a population of 721,599 as of the 2016 census, Mississauga is the sixth-most populous municipality in Canada, third-most in Ontario, and second-most in the Greater Toronto Area. The growth of Mississauga is attributed to its proximity to Toronto. During the latter half of the 20th century, the city attracted a multicultural population and built up a thriving central business district. It is home to Toronto Pearson International Airport, Canada's busiest airport, as well as the headquarters of many Canadian and multinational corporations. Residents of the city are often referred to as Mississaugans.