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.

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 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.

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.