Markham—Stouffville (provincial electoral district)

Markham—Stouffville is a provincial electoral district in Ontario. It encompasses a portion of Ontario formerly included in the electoral districts of Markham—Unionville (provincial electoral district) and Oak Ridges—Markham (provincial electoral district).

The boundaries of the provincial riding of Markham—Stouffville are identical with those of the new federal riding of Markham—Stouffville, created by the 2012 Canadian federal electoral redistribution. The provincial redistribution came into effect upon the call of the 42nd Ontario provincial election in June 2018.

The territory of the new riding (map) consists of part of the Regional Municipality of York: (a) the Town of Whitchurch–Stouffville; and (b) the part of the City of Markham lying easterly of a line described as follows: commencing at the intersection of the northerly limit of Markham with Highway 48; then southerly along Highway 48 to 16th Avenue; then westerly to McCowan Road; then southerly to Highway 407; then easterly along Highway 407 to the Rouge River; then generally southeasterly along Rouge River to the southerly limit of Markham. The riding's population was estimated at 109,780 at the time of the 2012 Canadian federal electoral redistribution.