Established in 1993, area code 905 encircles Toronto with its fast-growing suburbs, including Mississauga, Vaughan, and Oakville. The region is often seen as the commuter belt, but its economic importance and cultural diversity rival the downtown core. It’s home to major corporate offices, multicultural neighborhoods, and families seeking space beyond the city. Overlays like 289 and 365 now accompany 905 in this rapidly expanding zone.