Sainte-Marthe-sur-le-Lac (, ) is an off-island suburb of Montreal, in the Canadian province of Quebec, in the Deux-Montagnes Regional County Municipality, from Montreal. It is crossed from east to west by Route 344, commonly known as Oka Road. The town shares its borders with Deux-Montagnes to the east, Saint-Joseph-du-Lac to the west, the Lake of Two Mountains to the south, and Saint-Eustache to the north.
It shares police, firefighters, waterworks, and other services with the city of Deux-Montagnes.
It was formerly known as a rural town in which most of its inhabitants were seasonal vacationers, but it is increasingly lived in year-round.
On 27 April 2019, there was a flooding that forced more than 6000 people to be evacuated.
In the 2021 Census of Population conducted by Statistics Canada, Sainte-Marthe-sur-le-Lac had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.
Population trend:
Mother tongue:
The Commission scolaire de la Seigneurie-des-Mille-ÃÂles (CSSMI) operates Francophone schools. This community has three elementary schools (Horizon-du-Lac, Des-Lucioles, and des Grands-Vents) and one alternative lower secondary school (ÃÂcole secondaire Liberté-Jeunesse). ÃÂcole Polyvalente Deux-Montagnes has upper secondary education. Some areas are served by ÃÂcole des Mésanges and Emmanuel-Chénard, both also in Deux-Montagnes, and Polyvalente Deux-Montagnes (for all secondary levels).
Anglophone schools are operated by the Sir Wilfrid Laurier School Board, and the community is served by Lake of Two Mountains High School, in Deux-Montagnes. Mountainview Elementary School and Saint Jude Elementary School, both in Deux-Montagnes, also serve this community.