🇨🇦 403 area code
Area code 403 covers Calgary, Lethbridge, Medicine Hat and Red Deer and the surrounding area in Alberta, Canada. It shares that territory with 368, 568, 587, 780 and 825, so the same neighbourhood can have numbers in any of them. Enter a 403 number below for a free check before you call back.
- Location: Calgary, Alberta
- Time zone: Mountain (UTC−7)
- In service since 1947
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Area code 403 at a glance
- Area code
- 403
- Location
- Alberta, Canada
- Main cities
- Calgary, Lethbridge, Medicine Hat, Red Deer, Airdrie, Brooks
- Time zone
- Mountain (UTC−7)
- Local time now
- —
- In service since
- 1947
- Overlay codes
- 368, 568, 587, 780, 825
- Codes split from it
- 867
- Local calls
- Dial 10 digits
- Number format
- (403) 555-0123
- From abroad
- +1 403 555 0123
Cities in area code 403
- Calgary
- Lethbridge
- Medicine Hat
- Red Deer
- Airdrie
- Brooks
- Banff
- Canmore
- Cochrane
- High River
Is a 403 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 403 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 403 number to people in Alberta because a local-looking call is more likely to be answered. If a 403 call claims to be your bank, the IRS or the CRA or a delivery company, hang up and call the official number yourself.
About area code 403
403 is one of the original North American area codes, created in 1947 when AT&T and the Bell System first divided the continent into numbering plan areas.
It is part of the 368/403/568/587/780/825 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
As the region grew, 867 was carved out of or added to 403.
Area codes
More area codes in Alberta
All Alberta area codes · Every North American area code · International country codes
常见问题
Area code 403 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 403?
Area code 403 is in Alberta, Canada. It covers Calgary, Lethbridge, Medicine Hat, Red Deer, Airdrie and Brooks.
What time zone is area code 403?
403 is in the Mountain (UTC−7) time zone, and observes daylight saving time.
What area codes overlay 403?
368, 568, 587, 780 and 825 serve the same area as 403. Numbers in all of them are local to one another.
When did area code 403 start?
403 entered service in 1947.
How do I find out who called me from 403?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 403?
If you live in or near Alberta, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 403 callers who will not leave a message are best looked up before you call back.