It included the town of Whitchurch–Stouffville, most of the township of King (excepting extreme northeast) the northern portions of the town of Richmond Hill (including all of Oak Ridges), and the northern and eastern portions of the city of Markham.

The electoral district was created in 2004 52.5% from Oak Ridges, 30% from Markham, 13% from Vaughan—King—Aurora, and 4.5% from York North riding.

[2] The primarily urban district has a low proportion of Aboriginal residents compared to other parts of Canada, with just 625 people identifying themselves of such descent.

This riding has elected the following members of the House of Commons of Canada: 2004 change is based on redistributed results.

[9] The part that is the town of Whitchurch–Stouffville and in the City of Markham east of Ontario Highway 48 / Main Street Markham/ York Regional Road 68 was incorporated into the new Markham—Stouffville riding.