Area codes 514 and 438

514 and 438(514) and (438)514438Area code 514/438514/438area code 514438/514514, 438
Area codes 514 and 438 are telephone area codes in the North American Numbering Plan for Montreal and most of its on-island suburbs.wikipedia
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Area codes 819 and 873

819area code 819819, 873
The numbering plan area was split twice: in 1957 to create area code 819, and in 1998 to create area code 450.
514 originally covered the entire western half of Quebec from the US border to Hudson Strait, while 418 served the eastern half.

Area codes 450 and 579

450 and 579450450, 579
The numbering plan area was split twice: in 1957 to create area code 819, and in 1998 to create area code 450.
Area codes 450 and 579 are telephone area codes in the North American Numbering Plan for the Canadian province of Quebec, encompassing the off-island suburbs of Montreal, which is served by area codes 514 and 438.

Overlay plan

overlayoverlaidoverlay area code
The area codes are assigned in an overlay plan to a territory that includes the Island of Montreal, Île Perrot, and Île Bizard in the province of Quebec.
Those are some of the reasons that the numbering plan areas corresponding to four of the five largest Canadian markets (416 in Toronto, 514 in Montreal, 604 in Vancouver, and 403 in Calgary) were split in the 1990s.

Area codes 418, 581, and 367

418 and 581418418, 581
Quebec was split between area codes 514 and 418.
Nominally, northwestern Quebec—one of the few areas of North America without telephone service—was reassigned from area code 514 to 418 in 1957.

Montreal

Montreal, QuebecMontréalMontreal, Canada
Area codes 514 and 438 are telephone area codes in the North American Numbering Plan for Montreal and most of its on-island suburbs.

Île Perrot

Perrot IslandIle PerrotÎle-Perrot
The area codes are assigned in an overlay plan to a territory that includes the Island of Montreal, Île Perrot, and Île Bizard in the province of Quebec.

List of original NANP area codes

original area codesoriginal 86 area codesoriginal area code
The initial area codes were created in 1947 as routing codes for operator-assisted calls.

Greater Montreal

Greater Montreal AreaMontreal Metropolitan Communityoff-island suburb
A few western on-island suburbs (the "West Island") were never combined into the main Montreal rate centre and therefore have a reduced subset of the Montreal local calling area.

West Island

west end of the islandWest Island municipalitieswestern part
A few western on-island suburbs (the "West Island") were never combined into the main Montreal rate centre and therefore have a reduced subset of the Montreal local calling area.

Westmount, Quebec

WestmountCity of Westmountcommunity
These arbitrary boundaries do not necessarily correspond in any way to the original boroughs, the "une île, une ville" municipal amalgamation or the subsequent de-fusion of areas like Westmount.

Telephone numbering plan

Area codeTelephone codearea codes
Area codes 514 and 438 are telephone area codes in the North American Numbering Plan for Montreal and most of its on-island suburbs.

North American Numbering Plan

Area codeArea codesArea code(s)
Area codes 514 and 438 are telephone area codes in the North American Numbering Plan for Montreal and most of its on-island suburbs.

Island of Montreal

Montreal IslandMontrealÎle de Montréal
The area codes are assigned in an overlay plan to a territory that includes the Island of Montreal, Île Perrot, and Île Bizard in the province of Quebec.

Île Bizard

BizardL'Île-BizardÎle-Bizard
The area codes are assigned in an overlay plan to a territory that includes the Island of Montreal, Île Perrot, and Île Bizard in the province of Quebec.

Quebec

QuébecProvince of QuebecQC
The area codes are assigned in an overlay plan to a territory that includes the Island of Montreal, Île Perrot, and Île Bizard in the province of Quebec.

AT&T

AT&T Inc.Southwestern Bell CorporationAT&T Latin America
Area code 514 was one of the 86 original numbering plan areas (NPAs) defined by AT&T in 1947.

Ten-digit dialing

10-digit dialingten-digit diallingten digits
In November 2006, the entire remaining numbering plan area 514 was assigned a second area code, 438, making ten-digit dialing mandatory in the Montreal area.

Bell Canada

BellBell Telephone Company of CanadaBCE
The incumbent local exchange carrier (ILEC) in the service area is Bell Canada.

Vidéotron

VideotronVidéotron MobileIllico Télé Numérique
The major competitive local exchange carriers (CLEC's) are Vidéotron, Telus, Rogers.

Telus

Telus CorporationTelus CommunicationsTELUS TV
The major competitive local exchange carriers (CLEC's) are Vidéotron, Telus, Rogers.