The Société de transport de Montréal (STM) operates 220 daytime and 23 night service routes and provides a vast number of routes for the Island of Montreal, serving an average of 749,500 passengers on an average weekday as of 2025.
A route is referred to by its route number and name (such as 80 Du Parc). The name of the route is usually named after the road or the community that it primarily serves.
Express routes are usually denoted by a 4 before the number of its local equivalent (such as 480 Express Du Parc). However, there are some exceptions (such as 49 Maurice-Duplessis/448 Express Maurice-Duplessis), and some express routes (such as 475 Express Dollard-Des-Ormeaux) have no local equivalents.
Bicycle racks are equipped on bus routes 34, 50, 94, 140, 146, 180, 185, and 769.
The following is a complete list of all current STM bus routes.