Mississauga ( (listen) MISS-ih-SAW-gÉ™), historically known as Toronto Township, is a city in the Canadian province of Ontario. It is situated on the shores of Lake Ontario in the Regional Municipality of Peel, bordering Toronto to the east. With a population of 717,961 as of 2021, Mississauga is the seventh-most populous municipality in Canada, third-most in Ontario, and second-most in the Greater Toronto Area after Toronto itself. However, for the first time in its history, the city's population declined according to the 2021 census, from a 2016 population of 721,599 to 717,961, a 0.5 percent decrease.The growth of Mississauga was 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.