Deux-Montagnes’ first name was Saint-Eustache-du-Lac. When it was officially founded on August 18, 1921, this municipality’s population totalled less than 300 permanent residents. Today’s Grand-Moulin District, which would much later be called Deux-Montagnes, is the area where these first inhabitants chose to elect residence.
The City of Deux-Montagnes was named as such in 1963. It is said that Deux-Montagnes gets its geographic name from the two mountains that coureurs des bois, voyageurs and, before them, American Indians, could see from the northwestern shores of the lake after the portage from Sainte-Anne-de-Bellevue. One of them is the Calvaire Mountain and the other, its twin, is Saint-Joseph-du-Lac Hill.
If you would like to know more about the history of the City of Deux-Montagnes, you can consult Stéphane Plante’s book Ville de Deux-Montagnes, 1804-1994 or Germain Beauchamp and Marcel Paquette’s book Deux-Montagnes dans le cours de l’histoire, both available at the municipal library.