Area Code Atlas

CRTC approves overlay relief for 613 with NPA 343

On September 10, 2008, the CRTC approved the introduction of area code 343 as an overlay for the 613 region to address projected number exhaustion.

NPA 343 overlay on 613 announced

NPA 343 to Overlay NPA 613 (Eastern Ontario, Canada)

Area code 343 activated as overlay on 613

On May 17, 2010, area code 343 was activated as an overlay on area code 613 in eastern Ontario, including Ottawa. This provided additional numbering resources for the growing population and telecommunications demand in the region, allowing new numbers to be assigned with the 343 code throughout the region.

NPA 753 overlay on 343/613 announced

NPA 753 to Overlay NPA 343/613 (eastern Ontario)

CRTC approves overlay relief for 343/613 with NPA 753

On November 10, 2021, the CRTC approved the introduction of area code 753 as an additional overlay for the 343/613 region to address continued number exhaustion. The Canadian Numbering Administrator approved area code 753 in response to projected number exhaustion, addressing the continued demand for telephone numbers in the region.

NPA 343/613 (eastern Ontario) – amending PL-571

NPA 753 overlay activated

Area code 753 was activated on March 26, 2022, as a second overlay to the 613/343 numbering plan area to address continued number exhaustion.

Area code 871 reserved for future overlay

Area code 871 has been reserved as a fourth area code for the 613/343/753 numbering plan area since May 20, 2025, to provide relief for future number exhaustion.