[citation needed] Exo's territory is concurrent with Montreal Metropolitan Community limits, with the addition of the Kahnawake First Nations reserve and the city of Saint-Jérôme.

[4] It serves a population of approximately 4 million people who make more than 174,000 trips daily in the 4,258.97 km2 (1,644.40 sq mi) area radiating from Montreal.

A new agency, the Réseau de transport métropolitain (RTM) was created to be responsible for operating commuter rail and suburban transit services.

The Mont-Saint-Hilaire and Mascouche lines run on Canadian National trackage and operate out of Central Station, while the Vaudreuil-Hudson, Saint-Jérôme, and Candiac lines run on Canadian Pacific Kansas City (CPKC) trackage and operate out of Lucien L'Allier terminus, beside the historic Windsor Station.

In 2018, Exo carried 174,710 passengers on a typical weekday — 77,210 on the trains and 97,500 by commuter bus, including adapted transport.