In 1996, Ontario was divided into the same electoral districts as those used for federal electoral purposes.
They were redistributed whenever a readjustment took place at the federal level.

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, including Kenora—Rainy River, are those defined for federal purposes in 1996, based on the 1991 census (except for a minor boundary adjustment).
The 96 southern electoral districts are those defined for federal electoral purposes in 2003, based on the 2001 census.
Without this legislation, the number of electoral districts in northern Ontario would have been reduced from eleven to ten.

Prior to the 2018 provincial election, the Ontario government's Far North Electoral Boundaries Commission proposed dividing Kenora—Rainy River into one riding for the urbanized southern portion of the current district, which will retain the name Kenora—Rainy River, and one riding for the predominantly Indigenous northern portion of the current district, to be named Kiiwetinoong.
The creation of Kiiwetinoong and Mushkegowuk—James Bay, another new northern riding, were approved with the passage of the Representation Statute Law Amendment Act, 2017 in the Legislative Assembly of Ontario.
In 1996, Ontario was divided into the same electoral districts as those used for federal electoral purposes. They were redistributed whenever a readjustment took place at the federal level.
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, including Kenora—Rainy River, are those defined for federal purposes in 1996, based on the 1991 census (except for a minor boundary adjustment). The 96 southern electoral districts are those defined for federal electoral purposes in 2003, based on the 2001 census. Without this legislation, the number of electoral districts in northern Ontario would have been reduced from eleven to ten.
Prior to the 2018 provincial election, the Ontario government's Far North Electoral Boundaries Commission proposed dividing Kenora—Rainy River into one riding for the urbanized southern portion of the current district, which will retain the name Kenora—Rainy River, and one riding for the predominantly Indigenous northern portion of the current district, to be named Kiiwetinoong. The creation of Kiiwetinoong and Mushkegowuk—James Bay, another new northern riding, were approved with the passage of the Representation Statute Law Amendment Act, 2017 in the Legislative Assembly of Ontario.
Kenora—Rainy River (provincial electoral district)