Geographic Overview of Area Code 438

Area code 438 is primarily used in the Montréal area, covering the Island of Montréal and its on-island suburbs, including Île Perrot in Quebec, Canada. Major cities and towns include Montréal, Laval, and Longueuil, as well as boroughs such as Côte Saint-Luc, Hampstead, L'Île-Dorval, Montréal-Est, Montréal West, Mount Royal, and Westmount.

This code is an overlay for 514—both serve the same region alongside the newer 263 area code introduced in October 2022 to address growing telecommunications demand. The Canadian Radio-television and Telecommunications Commission (CRTC) implemented this third overlay to extend numbering resources, with current projections indicating the combined 514/438/263 complex will exhaust by February 2033. Nearby area codes include 819/873 (Sherbrooke) and 450/579 (Granby).