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, 40 km 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.

Quick Facts Country, Province ...

Sainte-Marthe-sur-le-Lac
City
Street in Sainte-Marthe-sur-le-Lac
Location within Deux-Montagnes RCM
Ste-Marthe-sur-le-Lac Location in central Quebec
Coordinates: 45°32′N 73°56′W[1]
Country	Canada
Province	Quebec
Region	Laurentides
RCM	Deux-Montagnes
Constituted	January 1, 1960
Government [2]
• Mayor	François Robillard
• Federal riding	Mirabel
• Prov. riding	Mirabel
Area [2][3]
• Total	12.80 km2 (4.94 sq mi)
• Land	8.73 km2 (3.37 sq mi)
Population  (2021)[3]
• Total	19,797
• Density	2,067.4/km2 (5,355/sq mi)
• Pop 2016-2021	9.5%
• Dwellings	7,642
Time zone	UTC−5 (EST)
• Summer (DST)	UTC−4 (EDT)
Postal code(s)	J0N
Area code(s)	450 and 579
Highways A-640	R-344
Website	www.ville.sainte-marthe-sur-le-lac.qc.ca

Close

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.

In the 2021 Census of Population conducted by Statistics Canada, Sainte-Marthe-sur-le-Lac had a population of 19,797 living in 7,503 of its 7,642 total private dwellings, a change of 9.5% from its 2016 population of 18,074. With a land area of 8.73 km² (3.37 sq mi), it had a population density of 2,267.7/km² (5,873.3/sq mi) in 2021.^[4]

Population trend:^[5]

• Population in 2021: 19,797 (2016 to 2021 population change: 9.5%)
• Population in 2016: 18,074 (2011 to 2016 population change: 15.2%)
• Population in 2011: 15,689 (2006 to 2011 population change: 38.7%)
• Population in 2006: 11,311 (2001 to 2006 population change: 29.4%)
• Population in 2001: 8,742
• Population in 1996: 8,295
• Population in 1991: 7,410

Mother tongue:

• English as first language: 4.7%
• French as first language: 87.1%
• English and French as first language: 1.1%
• Other as first language: 6.1%

The Commission scolaire de la Seigneurie-des-Mille-Îles (CSSMI) operates Francophone schools.^[6] This community has three elementary schools (Horizon-du-Lac,^[7] Des-Lucioles,^[8] and des Grands-Vents^[9]) and one alternative lower secondary school (École secondaire Liberté-Jeunesse). École Polyvalente Deux-Montagnes has upper secondary education. Some areas are served by École des Mésanges and Emmanuel-Chénard, both also in Deux-Montagnes, and Polyvalente Deux-Montagnes (for all secondary levels).^[10]

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.^[11] Mountainview Elementary School and Saint Jude Elementary School, both in Deux-Montagnes, also serve this community.^[12][13]

On 27 April 2019, there was a flooding that forced more than 6000 people to be evacuated.^[14]