343
Area code
ONTARIO
Canada geographic area code, in service since 2010-05-17. Part of the 343/613/753 overlay complex — ten-digit dialing required.
Statusin service
Introduced2010-05-17
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- 2021-11-17 NPA 343/613 (eastern Ontario) – amending PL-571 other
- 2021-11-10 NPA 753 to Overlay NPA 343/613 (eastern Ontario)
- 2009-01-15 NPA 343 to Overlay NPA 613 (Eastern Ontario, Canada)
- 2010-05-17Area code 343 entered service (created from 613).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2009-01-15 | PL-386 ↗ | NPA 343 to Overlay NPA 613 (Eastern Ontario, Canada) |