Dorval is an on-island suburban city on the island of Montreal in southwestern Quebec, Canada. In 2016, the Canadian Census indicated that the population increased by 4.2% to 18,980. Although the city has the largest surface area in Montréal’s west side, it is among the least densely populated. Montréal–Pierre Elliott Trudeau International Airport constitutes about 60% of the city's land; consequently, all of Dorval's population is concentrated in the southern part of the city.

Greater Montreal is the most populous metropolitan area in Quebec and the second most populous in Canada after Greater Toronto. In 2015, Statistics Canada identified Montreal's Census Metropolitan Area (CMA) as 4,258.31 square kilometres (1,644.14 sq mi) with a population of 4,027,100, almost half that of the province.