Amédée Dion, the first mayor of Boisbriand (then Sainte-Thérèse-Ouest)

In 2021, the City of Boisbriand is celebrating its 75th anniversary. It was on January 1, 1946 that the municipality of Sainte-Thérèse-Ouest was founded, following its detachment from the parish of Sainte-Thérèse de Blainville. It is also the fruit of a long political struggle that began in 1925 and during which politicians and citizens got involved. Here is a brief overview the history of Boisbriand.

“Boisbriand’s history is rich and goes well beyond its own borders. It was here, in 1683, precisely where Highway 15 crosses the Chemin de la Grande-Côte that the first seigneury was granted to Sieur de Boisbriand Michel-Sidrac Du Gué by King Louis XIV. The City of Boisbriand is 75 years old, but the origins of its history go back more than 338 years, ”says Mayor Marlene Cordato.


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The initial territory of Sainte-Thérèse-Ouest (49.98 km2) became fragmented over the years, as land was ceded to neighboring towns, notably Blainville, Sainte-Thérèse and more recently, Saint-Eustache. The largest transfer, an area of ​​18.46 km2, was granted to the City of Mirabel in 1969, when the federal government expropriated a large area to allow the development of the future Mirabel airport. Today, Boisbriand covers an area of ​​27.83 km2.

Highlights in the history of Boisbriand:

1946     Birth of the municipality of Sainte-Thérèse-Ouest. The first mayor, Amédée Dion, will keep his post until his death on February 27, 1951. City councilor Gustave Desjardins will succeed him.


Construction of Autoroute 15


Construction of Autoroute 640


Arrival of General Motors in Sainte-Thérèse-Ouest


The Town is required to get rid of part of its territory, now part of the Town of Mirabel.


On July 15, the status of town is granted to Sainte-Thérèse-Ouest.


On March 16, 1974, the Town of Sainte-Thérèse-Ouest officially becomes the Town of Boisbriand. The population is then 9,000 residents. Today it has more than 27,000 citizens.


Commissioning of Autoroute 13

Over the next few months, the history of Boisbriand will be told in various ways, notably through publications in Info Boisbriand and on the Town’s website, as well as through conferences.

The City also invites citizens who wish to provide photos or tell anecdotes about the history of Boisbriand to do so by email at