Local administrative structures emerged in Saint-Constant in 1845 with the introduction of the parish municipality and the school board. However, the vast territory of the parish of Saint-Constant was already subdivided for Saint-Rémi (1840), Saint-Édouard (1833), and Saint-Isidore (1833). This trend continued with the establishment of Saint-Michel (1854), Saint-Mathieu (1919) and Sainte-Thérèse-de-Delson (1932). One of the mayors, Solime Cardinal (1815–1897), was the maternal grandfather of Charles-Émile "Charley" Trudeau, a successful French Canadian entrepreneur who became the father of Pierre Elliott Trudeau, 15th Prime Minister of Canada, and grandfather of Justin Trudeau, 23rd and current Prime Minister of Canada.