403 area code
Calgary area, Mountain Time.Area code 403 covers Calgary, Red Deer, Lethbridge and 139 more places in Alberta, on Mountain Time. 368, 587, 780 and 825 cover the same area.
Right now in Calgary
Mountain Time (MST, UTC-7; MDT, UTC-6 in summer)
Calling hours: Mon to Fri, 9 AM to 9:30 PM · Sat to Sun, 10 AM to 6 PM (Canada's CRTC rules)
Calling a lot of them? RegieGO dials up to five lines at once. See the dialer
Where 403 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 403 has 142. Each one's share is how many 403 numbers start there.
- Calgary47%
- Red Deer5%
- Lethbridge4%
- Medicine Hat3%
Also: High River, Canmore, Strathmore, Brooks, Banff, Olds, Rocky Mountain House, Crowsnest Pass, Airdrie, Drumheller, Pincher Creek, Cochrane + 126 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 403 number?
Sales calls to homes and cell phones have legal hours, set by Canada's CRTC rules. Hold every 403 number to them, since you can't tell a work line from a personal cell.
What applies to 403Mon to Fri, 9 AM to 9:30 PM · Sat to Sun, 10 AM to 6 PM
- Canada (CRTC)Mon to Fri, 9 AM to 9:30 PM · Sat to Sun, 10 AM to 6 PMApplies to calls to businesses too. Some provinces add rules the tool doesn't apply, like British Columbia's ban on calls on statutory holidays.CRTC Unsolicited Telecommunications Rules, Part III, s. 23 (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
403 and 368, 587, 780 and 825
403 is one of the original area codes from 1947, and 867 was later split off from it. 403, 368, 587, 780 and 825 cover the same area, so new numbers can get any of them and neighbors can have different area codes. 403 holds 24% of the area's exchanges, the most of any code here. Local calls take all 10 digits.
- 1947403 starts
- 1997867 split off
- 1999780 overlay
- 2008587 overlay
- 2016825 overlay
- 2022368 overlay
Source: NANPA area code database
Calling a list of 403 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
403 area code FAQ
What area code is 403?
403 is an Alberta area code for Calgary, Red Deer, Lethbridge, Medicine Hat and 138 more places.
What time zone is the 403 area code in?
Mountain Time (MST, UTC-7; MDT, UTC-6 in summer).
Is 368 the same as 403?
Same area, different code. 403, 368, 587, 780 and 825 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 403 numbers?
Mon to Fri, 9 AM to 9:30 PM · Sat to Sun, 10 AM to 6 PM, local time, under Canada's CRTC rules.
When did the 403 area code start?
In 1947: it's one of the original area codes.
Calling 403 numbers? Reach more of them.
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