Area codes 587, 825, and 368 are telephonearea codes in theNorth American Numbering Plan (NANP) for the entire Canadian province ofAlberta. They form anoverlay witharea code 403 of southern Alberta, and northern Alberta's780. The province-wide overlay complex madeten-digit dialing mandatory throughout the province.
Prior to 1997, numbering plan area 403 comprised Alberta,Yukon and theNorthwest Territories, as well as a very small western portion of what is todayNunavut (which split off from the Northwest Territories on 1 April 1999). In 1997, use of area code 403 was restricted to Alberta, with the territories receiving newarea code 867.
In January 1999, the province was divided into two numbering plan areas. The northern two thirds of Alberta, includingEdmonton, received area code 780, while leaving 403 to serveCalgary and southern Alberta.
The projectedexhaust dates for area codes 403 and 780 were March and October 2009, respectively. In 1997, two area codes, 587 and 825, were reserved byBellcore for Alberta.[1]
The first of the new area codes, 587, entered service on September 19, 2008, as an overlay for the entire province.[2][3][4] As a preliminary step,ten-digit dialling was introduced across the province on an optional basis on June 23. This became mandatory on September 12. On September 20,Telus Mobility began allocating telephone numbers starting in area code 587 in the Calgary area.[5]
An overlay was chosen rather than a splitting 403 or 780, which would have resulted in subscribers in portions of Alberta to change their telephone numbers for the second time in a decade. A similar step had been taken a year earlier inBritish Columbia, whenarea code 778 was converted into an overlay complex for the entire province.
On April 9, 2016, the province was overlaid with an additional area code, 825.[6]
As of January 21, 2022, the province is additionally overlaid with area code 368.[7][8]
Area code 568 is reserved as the sixth area code for the province since November 2022.[9]
 | This section needs to beupdated. Please help update this article to reflect recent events or newly available information.(August 2023) |
 | This sectiondoes notcite anysources. Please helpimprove this section byadding citations to reliable sources. Unsourced material may be challenged andremoved. Find sources: "Area codes 587, 825, and 368" – news ·newspapers ·books ·scholar ·JSTOR(August 2023) (Learn how and when to remove this message) |
| North:867 | ||
| West:250/778/236/672 | 368/587/825,403,780 | East:306/639 |
| South:406 | ||
| British Columbia area codes:250,604,778/236/672 | ||
| Saskatchewan area codes:306/639/474 | ||
| Montana area codes:406 | ||
| Yukon,Northwest Territories andNunavut area codes:867 | ||
55°59′30″N114°22′36″W / 55.99167°N 114.37667°W /55.99167; -114.37667