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# The 587 Area Code and Alberta's Numbering System
The 587 area code serves as an overlay to Alberta, Canada, covering the same geographic region as the established 403 area code in southern and central Alberta. Introduced in 2013, the 587 area code was created to meet the growing demand for telephone numbers in the province as businesses, residents, and mobile devices proliferated. This overlay system allows both area codes to coexist within the same territory, meaning that callers in Alberta may reach the same location using either 587 or 403. The 587 area code is primarily assigned to new phone lines, including mobile phones and internet-based services, while existing 403 numbers remain active, ensuring that established businesses and residents were not disrupted by the transition.
The North American Numbering Plan (NANP) designates area codes like 587 through a coordinated system managed by the North American Numbering Plan Administrator (NANPA) in consultation with telecommunications regulatory bodies. When a region exhausts available numbers within its existing area code, the NANP implements overlay area codes as a solution to accommodate growth without reassigning existing numbers or changing geographic boundaries. This system prioritizes continuity and minimizes disruption while supporting economic expansion and technological advancement. The 587 area code exemplifies how the NANP adapts to modern telecommunications needs, particularly in regions experiencing rapid population growth and increased demand for phone numbers across multiple service types.