Development had begun to spread into Greenfield Park, which merited the establishment of a town to provide services for the population.

[9] Greenfield Park was named after the area's primary geographical features, which were in fact green fields and forests.

The original Charter of Greenfield Park gave reasoning for the town's creation: Whereas the rate-payers of the territory comprised in cadastral lots Nos .

In 1913, Greenfield Park, along with neighbouring municipalities St. Lambert, Montreal South and Longueuil, built a shared sewer system and water filtration plant.

[10] During World War I, such a high percentage of Greenfield Parkers served in the Canadian forces that regular town meetings could not be held.

[citation needed] Similarly, in World War II, Greenfield Park was the Canadian community that had one of the highest participation rate of military volunteers for its size.

[citation needed] In the early 1960s, Greenfield Park acquired 40 percent more land by annexing part of Saint-Hubert.

[10][12] Greenfield Park was a town until January 1, 2002, when it along with several other suburbs on Montreal's South Shore were merged into the amalgamated city of Longueuil.

The Greenfield Park motto, "Fortis Fortunam Superat," or "Fortune Favors the Brave," is attributed to Villar.

Greenfield Park is in the federal riding of Longueuil—Charles-LeMoyne and its Member of Parliament is Sherry Romanado (Liberal Party of Canada).

It also belongs to the provincial riding of Laporte and its Member of the National Assembly is Nicole Ménard (Quebec Liberal Party).