The federal riding was created in 1976 from parts of Mississauga and Mississauga Centre ridings.

It consisted initially of the part of the City of Mississauga lying south of a line drawn from west to east along Highway 5, south along Cawthra Road, and east along the Queen Elizabeth Way.

In 1987, it was redefined to consist of the part of the City of Mississauga lying south of a line drawn from southwest to northeast along Dundas Street West, east along the Credit River, northeast along the Queen Elizabeth Way, northwest along Cawthra Road, and northeast along the Queensway East to the eastern city limit.

In 1996, it was redefined to consist of the part of the City of Mississauga lying south of a line drawn from southwest to northeast along Dundas Street West, southeast along Erin Mills Parkway, northeast along the Queen Elizabeth Way, northwest along Hurontario Street, northeast along the Queensway East to the northeastern city limit.

In 2003, it was given its current boundaries as described above.