La Prairie, Quebec

La Prairie
City
Old La Prairie in 2025
Coat of arms
Motto(s):  Victor Hostium et Sui (Latin for "Master of our Enemies and Oneself")
Location within Roussillon RCM
La Prairie Location in southern Quebec
Coordinates: 45.42°N 73.5°W / 45.42; -73.5
Country	Canada
Province	Quebec
Region	Montérégie
RCM	Roussillon
Constituted	March 30, 1846
Government
• Mayor	Frédéric Galantai
• Federal riding	La Prairie
• Prov. riding	La Prairie
Area
• Total	54.80 km2 (21.16 sq mi)
• Land	43.47 km2 (16.78 sq mi)
Population  (2021)
• Total	26,406
• Density	607.4/km2 (1,573/sq mi)
• Pop 2016–2021	9.5%
• Dwellings	11,309
Demonym(s)	Laprairien,(ienne) (French)
Time zone	UTC−5 (EST)
• Summer (DST)	UTC−4 (EDT)
Postal code(s)	J5R
Area codes	450 and 579
Highways A-15 A-30	R-104 R-132 R-134 R-217
Website	www.ville.laprairie.qc.ca

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La Prairie (French pronunciation: [la pʁɛʁi]) is an off-island suburb (south shore) of Montreal, in southwestern Quebec, Canada, at the confluence of the Saint-Jacques River and the Saint Lawrence River in the Regional County Municipality of Roussillon. The population as of the Canada 2021 Census was 26,406.