437
Area code
ONTARIO
Canada geographic area code, in service since 2013-03-25. Part of the 416/437/647 overlay complex — ten-digit dialing required.
Statusin service
Introduced2013-03-25
JurisdictionONTARIO, CANADA
Local dialing10D
Time zoneEastern
Last verified2026-09-17
Area codes serve rate-center geographies, not municipal boundaries. “ONTARIO” identifies the jurisdiction, not an exact city footprint.
Change history
Recorded events for this NPA- 2013-01-24 NPA 437 to Overlay NPA 416/647 (Toronto, Canada)
- 2013-03-25Area code 437 entered service (created from 416).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2013-01-24 | PL-447 ↗ | NPA 437 to Overlay NPA 416/647 (Toronto, Canada) |
| 2012-09-27 | PL-441 ↗ | NPA 437 to Overlay NPA 416/647 (Toronto, Canada) |
| 2011-09-26 | PL-426 ↗ | NPA 437 to Overlay NPA 416/647 (Toronto, Canada) |