The district includes all of the Regional County Municipality of Rousillon including Kahnawake Indian Reserve No. 14, but excluding the cities of Candiac and La Prairie and the Municipality of Saint-Philippe in the east of the county municipality. The neighbouring ridings are Vaudreuil—Soulanges, Beauharnois—Salaberry, Brossard—La Prairie, LaSalle—Émard, Notre-Dame-de-Grâce—Lachine, and Lac-Saint-Louis.
This riding has elected the following Members of Parliament:
|Châteauguay prior to 2003|
|38th||2004-2006||Denise Poirier-Rivard||Bloc Québécois|
|39th||2006-||Carole Freeman||Bloc Québécois|