The location where La Morandière currently sits was initially settled in around 1916 by Émilien Plante, Uldéric Hardy and Charles Rochette but the territory didn't have any official status until January 1, 1983, the date when the municipality of La Morandière was founded.
In 1935 as part of the Vautrin Settlement Plan, Rochebaucourt was colonized by pioneers from Saint-Antoine-sur-Richelieu, Saint-Hyacinthe, and Salaberry-de-Valleyfield. It was first known as Colonie-33 but this was quickly replaced by Rochebaucourt, the name of the geographic township in which it is located. La Rochebaucourt was a cavalry captain of the Régiment de Languedoc in General Montcalm's army. In 1940, the Parish of Saint-Antoine-de-Rochebaucourt was established.
In 2022, it was decided to merge the two municipalities to form the new Municipality of La Morandière-Rochebaucourt.
^ ab"La Morandière-Rochebaucourt". Répertoire des municipalités (in French). Ministère des Affaires municipales, des Régions et de l'Occupation du territoire. Retrieved 2023-03-18.