437 is an in-service Canada area code assigned to Ontario. It identifies a numbering region, not a caller’s current location.
NANPA assigns 437 to Ontario. The Canadian regulator identifies 437 as part of Toronto’s 416/647/437 overlay area and approved 942 for the same area beginning April 26, 2025. Browse other codes in Ontario
Additional area detail: CRTC decision 2023-135.
View the official area-code maps ↗. Maps show numbering areas, not a caller’s location.
NANPA lists Eastern for this numbering area. These are numbering-region time zones, not a caller’s current location.
An area code can span more than one time zone. Local daylight-saving rules may differ.
The NANPA source lists 416, 647 in the same overlay complex. An overlay can serve the same broad numbering area; individual numbers still do not prove where a person is.
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 +1 437 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.
The Canadian Numbering Administrator listed 548 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 area | In-service prefixes |
|---|---|
| Toronto | 548 |
| Assignment company | In-service prefixes |
|---|---|
| Rogers Communications Canada Inc. (Wireless) | 158 |
| Bell Mobility | 136 |
| TELUS Mobility | 60 |
| Iristel Inc. | 58 |
| Fido Solutions Inc. | 47 |
548 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.
The public area-code file loads when you search. Your search stays in your browser.
Enter the full ten-digit number to see its structure and formatting. The check stays in your browser.
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.
Processed locally in your browser. Nothing you enter is sent to OfficialAreaCode or saved.
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.
Yes. Area code 437 is an active overlay code serving the City of Toronto, Ontario, Canada, alongside 416, 647, and 942.
437 is assigned to Ontario, and the NANPA record associates it with Eastern 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.
No. An area code is an assignment, and a person can travel, move, use internet calling, or display a spoofed number.
No. OfficialAreaCode has no live subscriber directory or spam-report database.