Area code

ONTARIO

Canada geographic area code, in service since 2022-06-18. Part of the 249/683/705 overlay complex — ten-digit dialing required.

Split from 705. Overlaid with 249, 705 .

Statusin service

Introduced2022-06-18

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

2021-11-10 NPA 683 to Overlay NPA 249/705 (central and northeastern Ontario) overlay
2022-06-18Area code 683 entered service (created from 705).

Primary documents

NANPA planning letters for area code 683
Date	Document	Subject
2021-11-10	PL-570 ↗	NPA 683 to Overlay NPA 249/705 (central and northeastern Ontario)