Dorval is an on-island suburban city on the island of Montreal in southwestern Quebec, Canada. In 2016, the Canadian Census indic…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.