High Quality Content by WIKIPEDIA articles! The Regional Municipality of Peel (also known as Peel Region) is a regional municipality in Southern Ontario, Canada. It consists of three municipalities to the west and northwest of Toronto: the cities of Brampton and Mississauga, and the town of Caledon. The entire region is part of the Greater Toronto Area and the inner ring of Golden Horseshoe. The regional seat is in Brampton. With a population of 1,159,405 (2006 census), Peel Region is the second-largest municipality in Ontario after Toronto. Owing to immigration and its transportation infrastructure (with seven 400-series highways serving the region, and Toronto Pearson International Airport located completly within its boundaries), Peel Region is a rapidly-growing area with a young population and an increasing profile.