Where is area code 403?
NANPA assigns 403 to Alberta. The source report does not provide city-level coverage for this record, so this page does not guess a particular city. Browse other codes in Alberta
Verified area-code information
403 Area Code
403 is an in-service Canada area code assigned to Alberta. It identifies a numbering region, not a caller’s current location.
Official Numbering RegionVerified NANPA Assignment
AlbertaArea Code 403
Country: Canada•Time Zone: Mountain•Overlays: 368, 587, 825•In Service: 01-Jan-1947
- Numbering country
- Canada
- Area-code type
- Geographic
- Numbering region
- Alberta
- Time-zone information
- Mountain
- In service since
- 01-Jan-1947
View the official area-code maps ↗. Maps show numbering areas, not a caller’s location.
Time zones associated with 403
NANPA lists Mountain for this numbering area. These are numbering-region time zones, not a caller’s current location.
Mountain time
An area code can span more than one time zone. Local daylight-saving rules may differ.
What area codes overlay 403?
The NANPA source lists 368, 587, 825 in the same overlay complex. An overlay can serve the same broad numbering area; individual numbers still do not prove where a person is.
How do you dial a 403 number?
Use the North American country calling code +1 followed by the three-digit area code and seven-digit local number. For example, write the pattern as +1 403 XXX XXXX. Local dialing rules and charges depend on your location and provider. Check a supported dialing format or check NANPA’s 10-digit dialing list.
Canadian prefixes in 403
The Canadian Numbering Administrator listed 781 in-service prefixes for this area code on 2026-09-28. These are exchange-area and company assignments, not active-number or current-carrier records.
Exchange areas with the most listed prefixes
| Exchange area | In-service prefixes |
|---|---|
| Calgary | 370 |
| Red Deer | 40 |
| Lethbridge | 32 |
| Medicine Hat | 23 |
| Canmore | 11 |
Companies with the most listed assignments
| Assignment company | In-service prefixes |
|---|---|
| TELUS | 401 |
| TELUS Mobility | 95 |
| Rogers Communications Canada Inc. (Wireless) | 71 |
| Bell Mobility | 64 |
| Shaw Telecom Inc. | 59 |
403 Canadian prefix lookup
781 in-service prefixes are listed for this area code. Check a Canadian area code and prefix against CNA assignments. The exchange area and company describe the original code assignment, not where a caller is now.
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Check a number with area code 403
Enter the full ten-digit number to see its structure and formatting. The check stays in your browser.
Check a 403 number
Enter a 10-digit +1 North American number. We check its structure and area-code record, not the caller’s identity or whether the line is active.
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Received an unfamiliar call?
The displayed number may be spoofed. Do not rely on an area code as proof of caller identity. If the caller claims to represent a business, end the call and contact that business using a number you found independently.
Common questions about 403
What time zone is area code 403 in?
403 is assigned to Alberta, and the NANPA record associates it with Mountain time. A phone number does not reveal its owner’s current time zone. The clock above uses a representative time zone for the numbering area.
Does 403 mean the caller is in Alberta?
No. An area code is an assignment, and a person can travel, move, use internet calling, or display a spoofed number.
Can this page identify who called?
No. OfficialAreaCode has no live subscriber directory or spam-report database.