<P> Area codes 587 and 825 are telephone area codes that cover all of Alberta, Canada, in addition to the incumbent codes, southern Alberta's 403 and northern Alberta's 780 . Numbers in area code 587 started being allocated in late 2008 . The new area codes overlay 403 and 780 simultaneously, covering the entire province, and make 10 - digit dialing necessary throughout Alberta . </P> <P> Prior to 1997, area code 403 encompassed Alberta, Yukon and the region that currently defines the Northwest Territories as well as a very small western portion of what is today Nunavut (which split off from the Northwest Territories on April 1, 1999). However, in 1997, 403 began exclusively serving Alberta, with all other portions of 403 (as well as the portion of area code 819 that had served the region which is today's Nunavut but which, at the time, was still a part of the Northwest Territories) splitting off into a new area code 867 . In January 1999, the northern two - thirds of Alberta, including Edmonton, split off as 780, leaving 403 to serve Calgary and southern Alberta . The projected exhaust date for area codes 403 and 780 was March and October 2009, respectively . In 1997, two area codes, 587 and 825, were reserved for Alberta's use by Bellcore . </P>

Where is area code 587 located in canada
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