Area code 403, Telephone numbering plan in Alberta, Canada
Area code 403 is a telephone numbering plan covering southern Alberta and serving over 248 cities including Calgary, Red Deer, Lethbridge, and Medicine Hat. The code uses number ranges from 403-200 to 403-999 to assign phone numbers across the region.
This area code was established in 1947 as one of Canada's original telephone codes and initially covered the entire province. When northern Alberta received code 780 in 1999, the service area shifted to cover only the southern regions.
The telephone infrastructure under area code 403 connects rural communities and urban centers across southern Alberta, facilitating communication between diverse populations.
This code operates within an overlay system alongside codes 587, 825, and 368, meaning multiple codes serve the same geographic region. When dialing numbers in this area, treat all four codes as valid regardless of which one appears on any given number.
Area code 403 maintains separate rate centers that determine local calling boundaries, affecting telephone billing practices across different municipalities in southern Alberta.
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