The history of the city of Longueuil is inextricably linked with the era of New France's exploration. Its origins date back to 1657, when French military officer and explorer Charles Le Moyne was granted these lands on the banks of the St. Lawrence River as a seigneury by the French Crown. Initially, it was an agricultural estate named after a village in France where Le Moyne was presumably from. Longueuil officially gained village status much later, in 1848.
A key factor in Longueuil's development was its strategic geographical location. Situated directly across from Montreal on the south shore of the river, the city naturally became an important transport and economic satellite of the growing metropolis. Initially, the economy was based on agriculture, but with the growth of Montreal and the development of transportation links, including ferries and later bridges, Longueuil began to transform into a residential suburb. This process of suburbanization accelerated significantly in the 20th century.
Longueuil's early cultural and economic characteristics were determined by its status as a French seigneury in the province of Quebec. The French language and Catholic culture dominated here, which still forms the basis of the city's identity today, with over 80% of the population being Francophone. Over time, particularly in the second half of the 20th century, Longueuil evolved from an agrarian settlement into a multifunctional city with a developed industrial sector, notably in aerospace, and a significant residential sector. Today, it is Quebec's fifth-largest city and an essential part of the Greater Montreal area.