639 Area Code – Regina, Saskatchewan: Location, Time Zone & History

Area code 639 covers the entire Canadian province of Saskatchewan, sharing its territory with area code 306 rather than replacing it. The CRTC approved 639 in 2011 as a province-wide overlay meant to relieve 306 as it neared exhaustion, and the new code went into service on May 25, 2013 -- the 367th area code activated anywhere in the North American Numbering Plan. Mandatory ten-digit local dialing had begun a couple of weeks earlier, on May 11, 2013, ahead of the overlay's launch.

One detail from the rollout reflects local sensibility as much as engineering. When SaskTel weighed candidate codes for the 2013 overlay, it favored 639 over 474 partly out of tetraphobia, a cultural aversion to the number four. The 474 code was reserved anyway in 2010 and eventually introduced in October 2021 as a second, distributed overlay once additional numbers were needed. Saskatchewan also has its own relationship with time itself: since a 1966 provincial Time Act, clocks stay on Central Standard Time year-round, and the province never observes daylight saving time.

Economically, the numbering area centers on potash and mineral mining, agriculture and agri-food processing, oil and gas extraction, and government services, reaching population centers including Regina, Saskatoon, Prince Albert, and Moose Jaw.