742
Area code
ONTARIO
Canada geographic area code, in service since 2021-10-16. Part of the 289/365/742/905 overlay complex — ten-digit dialing required.
Statusin service
Introduced2021-10-16
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- 2021-06-07 NPA 742 to Overlay NPA 289/365/905 (Southern Ontario, Canada) – supersedes PL-550
- 2021-10-16Area code 742 entered service (created from 905).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-06-07 | PL-561 ↗ | NPA 742 to Overlay NPA 289/365/905 (Southern Ontario, Canada) – supersedes PL-550 |
| 2020-12-01 | PL-550 ↗ | NPA 742 overlay on NPA 289/365/905 (Southern Ontario) |