Saint-Joseph-du-Lac is a municipality in the Laurentides region of Quebec, Canada, part of the Deux-Montagnes Regional County Municipality.

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Saint-Joseph-du-Lac
Municipality
Location within Deux-Montagnes RCM.
St-Joseph-du-Lac Location in central Quebec.
Coordinates: 45°32′N 74°00′W[1]
Country	Canada
Province	Quebec
Region	Laurentides
RCM	Deux-Montagnes
Constituted	July 1, 1855
Government [2]
• Mayor	Benoit Proulx
• Federal riding	Mirabel
• Prov. riding	Mirabel
Area [2][3]
• Total	41.80 km2 (16.14 sq mi)
• Land	41.22 km2 (15.92 sq mi)
Population  (2021)[3]
• Total	7,031
• Density	170.6/km2 (442/sq mi)
• Pop 2016-2021	5.1%
• Dwellings	2,819
Time zone	UTC−5 (EST)
• Summer (DST)	UTC−4 (EDT)
Postal code(s)	J0N 1M0
Area code(s)	450 and 579
Highways A-640	R-344
Website	www.sjdl.qc.ca

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The territory of the municipality of Saint-Joseph-du-Lac was part of the Lac des Deux-Montagnes Seigneury for over a hundred years. This seigneury was granted on October 17, 1717, to the Sulpician Order of the Ecclesiastical Seminary of St. Sulpice in Paris, who already were lords of the Island of Montreal. In 1783, the Sulpicians signed a total of 25 concessions. Over the next ten years, from 1782 to 1793, 81 lands on the Saint-Joseph side were granted to settlers. In 1803, Côte Saint-Joseph Road was extended northward to allow settlers to travel to Saint-Benoît.^[4]

Around 1850, the inhabitants of the Saint-Joseph Concession started the process to obtain a parish, which was formally established in 1853. Two years later on July 1, 1855, the Parish Municipality of Saint-Joseph was formed.^[5] It extended over a length of 10 kilometres (6.2 mi) from Lake of Two Mountains to the limits of Saint-Benoît Parish, and a width of 3.5 kilometres (2.2 mi). The population at that time was 1020 people in about 180 families.^[4]

In 1856, the post office opened, being identified as Saint-Joseph-du-Lac in order to distinguish it from the many other locations called Saint-Joseph. In time this name also came to be used for the entire municipality.^[5]

In 1953, the southern portion of the municipality along Lake of Two Mountains separated from Saint-Joseph-du-Lac and became the Village Municipality of Pointe-Calumet. ^[6]

In the 1970s, Autoroute 640 was built through Saint-Joseph-du-Lac, putting economic pressure on the municipality. This led to new housing developments for Montreal commuters and a noticeable growth in population that had previously been stable for nearly 80 years. During the following two decades, several more new developments were built, including the Paquin, Brunet, and Parc Sectors.^[4]

Saint-Joseph-du-Lac is served on Highway 344 by routes 80 and 81 of the Exo Laurentides sector from Terminus Saint-Eustache via the Deux-Montagnes station. The other end for both routes is in Pointe-Calumet.

Population trend:^[7]

• Population in 2021: 7031 (2016 to 2021 population change: 5.1%)
• Population in 2016: 6687 (2011 to 2016 population change: 7.9%)
• Population in 2011: 6195 (2006 to 2011 population change: 24.9%)
• Population in 2006: 4958 (2001 to 2006 population change: 1.6%)
• Population in 2001: 4882
• Population in 1996: 4930
• Population in 1991: 4312

Private dwellings occupied by usual residents: 2743 (total dwellings: 2819)

Mother tongue:

• English as first language: 3.5%
• French as first language: 93.7%
• English and French as first language: 1.1%
• Other as first language: 1.6%

This section needs expansion. You can help by adding to it. (December 2014)

The Commission scolaire de la Seigneurie-des-Mille-Îles (CSSMI) operates Francophone public schools.^[8]

• École Rose-des-Vents^[9]
• École du Grand Pommier^[10]

Secondary students are zoned to École secondaire d'Oka in Oka.^[11]

The Sir Wilfrid Laurier School Board is the area English school board. Several Anglophone schools in Deux-Montagnes serve this community: Mountainview Elementary School,^[12] Saint Jude Elementary School,^[13] and Lake of Two Mountains High School.^[14]