It consisted initially of: 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.

[1] Prior to the 2018 provincial election, the Ontario government's Far North Electoral Boundaries Commission proposed dividing Timmins—James Bay into one riding for the city of Timmins, to be named Timmins, and another riding for the remainder of the current district, to be named Mushkegowuk—James Bay.

[2] The creation of Mushkegowuk—James Bay, Timmins, and Kiiwetinoong (another new northern riding) were approved with the passage of the Representation Statute Law Amendment Act, 2017 in the Legislative Assembly of Ontario.