In 2003, the riding was re-defined to consist of the regional county municipalities of Beauharnois—Salaberry, Les Jardins-de-Napierville, and Le Haut-Saint-Laurent, including the parts of Akwesasne Indian Reserve No. 15 that lie within Quebec. In the 2006 census 88.7% of its population reported French only as their home language, 9.3% English (mostly in Le Haut-Saint-Laurent).
In 1947, Beauharnois riding was re-created from Beauharnois—Laprairie and Châteauguay—Huntingdon.
In 1952, it became Beauharnois—Salaberry.
See Beauharnois for information on the riding prior to 1952.
The name of the riding was changed back to Beauharnois from 1966 to 1971, and from 1976 to 1977. The rest of time it was known as "Beauharnois—Salaberry" as it is known as today.
In 1952, Beauharnois—Salaberry consisted of the county of Beauharnois, the cities of Salaberry-de-Valley field and Beauharnois and the town of Maple Grove, the municipality of Saint-Joachim-de-Châteauguay, the towns of Châteauguay, Châteauguay Heights, and De Léry, and the municipalities of Saint-Anicet and Sainte Barbe.
Beauharnois—Salaberry was re-created in 1971 when Beauharnois was renamed. It consisted of the Cities of Beauharnois and Salaberry-de-Valleyfield, the Towns of Huntingdon and Maple Grove, the County of Beauharnois, and parts of the Counties of Châteauguay and Huntingdon.
Beauharnois—Salaberry was abolished in 1976, and redistributed between Beauharnois and Châteauguay (federal electoral district), but in 1977, before any election was held, Beauharnois was renamed as Beauharnois—Salaberry. It consisted of the Cities of Beauharnois and Salaberry-de-Valleyfield, the Towns of Huntingdon and Maple Grove, and parts of the Counties of Beauharnois, Châteauguay and Huntingdon.
In 1987, the riding was re-defined to consist of the towns of Beauharnois, Huntingdon, Léry, Maple Grove and Salaberry-de-Valleyfield, the counties of Beauharnois and Huntingdon, and the County of Châteauguay excluding the towns of Châteauguay and Mercier.
In 1996, the riding was re-defined to consist of the cities of Beauharnois, Huntingdon, Maple Grove and Salaberry-de-Valleyfield, and the County Regional Municipalities of Beauharnois—Salaberry, Le Haut-Saint-Laurent (including that part of the Akwesasne Indian Reserve contained in the Province of Quebec) and Les Jardins-de-Napierville, excepting: the City of Saint-Rémi; the parish municipalities of Saint-Édouard, Saint-Jacques-le-Mineur and Saint-Michel.
