Area Code Atlas

CRTC decision to implement area code 742 overlay

On October 28, 2020, the CRTC determined that relief for area codes 289, 365, and 905 would be provided by implementing a distributed overlay of new area code 742, with an effective date set for October 16, 2021.

NPA 742 overlay on NPA 289/365/905 (Southern Ontario)

NPA 742 overlay on 289/365/905 announced

NPA 742 to Overlay NPA 289/365/905 (Southern Ontario, Canada) – supersedes PL-550

Area code 742 added as fourth overlay to 905 complex

Area code 742 was introduced on October 16, 2021, as the fourth overlay area code for the Golden Horseshoe region, overlaying the existing 905, 289, and 365 area codes to provide additional numbering resources.

Area code 537 reserved for future relief in Golden Horseshoe

In November 2022, area code 537 was reserved by the CRTC as a fifth area code for future relief in the Golden Horseshoe region, to be activated when the existing overlay complex approaches exhaustion.

Area code 537 reserved for future relief in Golden Horseshoe

Area code 537 was reserved on November 8, 2022, as a fifth area code for future relief of the numbering plan area covering the Golden Horseshoe region in Ontario, Canada.