Sudbury electoral district consists of the part of the City of Greater Sudbury bounded on the west and south by the Greater Sudbury city limits, and on the north and east by a line drawn from the western city limit of Greater Sudbury east along the northern limit of the former Town of Walden, north, east and south along the limits of the former City of Sudbury, west along Highway 69 and Regent Street, south along Long Lake Road, west along the northern boundary of the Township of Broder, southwest along Kelly Lake, and south along the eastern limit of the former Town of Walden to the southern city limit of Greater Sudbury.

Ethnic groups: 87.9% White, 8.4% Aboriginal Languages: 65.3% English, 23.6% French Religions: 77.3% Christian (55.6% Catholic, 5.4% United Church, 4.3% Anglican, 1.7% Lutheran, 1.5% Baptist, 1.3% Pentecostal, 1.2% Presbyterian, 6.3% Other Christian), 20.8% No religion The provincial electoral district was first contested in the 1908 election.

In 2005, legislation was passed by the Legislature to divide Ontario into 107 electoral districts, beginning with the next provincial election in 2007.

The eleven northern electoral districts are those defined for federal purposes in 1996, based on the 1991 census (except for a minor boundary adjustment).

Without this legislation, the number of electoral districts in northern Ontario would have been reduced from eleven to ten.