The riding consists of the northwestern part of the City of Toronto. The eastern boundary is the Humber River East Branch and the Humber River from Steeles Avenue West south to a point just to the east of the Dixon Road. The southern boundary runs west from the Humber River along Dixon Road to Martin Grove Road to Eglinton Avenue to the western limit of the city. The western and northern limits of the ridings are formed by the city limits. In addition to Rexdale, the riding also contains the neighbourhoods of The Elms, Humberwood, Kingsview Village, Thistletown, and Willowridge.