Phone prefixes in Longueuil, QC

In numbers

In-service prefixes

41

Telephone numbers covered

410,000

Carriers

13

Area codes

3

Provinces and territories

1

First assignment

March 14, 2002

Most recent assignment

April 30, 2025

Longueuil’s share of its area codes

Within area code 450, Longueuil accounts for only 25 of 775 prefixes (3.2%): the code is dominated by Granby and spread over 129 rate centres. Within area code 579, Longueuil accounts for only 14 of 644 prefixes (2.2%): the code is dominated by Granby and spread over 126 rate centres. Within area code 354, Longueuil accounts for only 2 of 56 prefixes (3.6%): the code is dominated by Valleyfield and spread over 49 rate centres.

Who holds these numbers

Bell Canada holds the largest share at 13 prefixes, 31.7% of the total, ahead of 12 other carriers. Code by code: in 450, Bell Canada leads with 12 of 25 prefixes ahead of 7 others; in 579, Videotron Ltd. leads with 4 of 14 prefixes ahead of 6 others; in 354, Cogeco Connexion Inc. leads with 1 of 2 prefixes ahead of 1 others. No carrier holds prefixes in every one of Longueuil’s 3 area codes, while 9 appear in just one.

Wireless and wireline

1 of Longueuil’s 41 prefixes (2.4%) are held by carriers whose registered name marks a wireless business: Fido Solutions Inc. Wireline prefixes still outnumber them, carried by Bell Canada, Videotron Ltd, Iristel Inc and Fibernetics Corporation. This is a sort by name, not a licence lookup, and a mobile prefix may have been ported to another network since.

How the allocation was built up

Longueuil’s dated assignments run from 2002 to 2025. The busiest period was 2010–2014, when 10 prefixes went to 7 carriers. 13 prefixes (32%) carry no date in the register: these are the historic pre-1999 assignments, the wireline bedrock of the rate centre. Since 2020 another 6 prefixes have been added, so the rate centre is still growing.

Longueuil’s oldest prefixes, the ones the register leaves undated, belong to Bell Canada and Videotron Ltd: these carriers made up the landscape before competition arrived. The first dated assignment went to Rogers Communications Canada Inc. (Cable) in 2002. The most recent arrivals are Cogeco Connexion Inc. (2025), IXICA Communications Inc. (2022) and Bell Canada (2017), a sign that new carriers are still asking for numbers in Longueuil.

Longueuil’s 41 prefixes provide 410,000 numbers, which corresponds to a mid-sized city or a well-established suburb that every major carrier wants a slice of.

No single carrier dominates Longueuil: the leader, Bell Canada, holds only 31.7% of the prefixes against 12 competitors, a sign of a highly fragmented market where cable companies, mobility brands and VoIP providers weigh as much as the incumbent.

Demand remains steady: 21.4% of the dated prefixes go back to the last ten years, the most active period being 2010–2014. The rate centre is growing at a regular rather than explosive pace.

13 undated in the register.

Dialling a Longueuil number

Longueuil is served by 3 overlaid area codes (450, 579 and 354). A 354 number is no more “out of town” than a 450 one; from abroad, dial +1 and the full ten digits.

The numbering neighbourhood

Longueuil shares area codes 450, 579 and 354 with at least 20 other rate centres, including Granby, Joliette, St-Jerome, St-Hyacinthe, Ste-Therese, St-Lambert, Sorel and Pont-Viau. The largest of them, Granby, holds 52 prefixes in 354, 450 and 579; the smallest on the list, St-Vincent-de-Paul, has just 17.

What a Longueuil number tells you

A number attached to Longueuil tells you that its prefix was issued to a carrier for this rate centre in Quebec, most often Bell Canada. It does not tell you where the handset is today: a subscriber may have ported the number to any of the 13 carriers present here or to a VoIP service usable anywhere. Nor does it tell you who is calling: caller ID can be spoofed, and a Quebec area code is easy to borrow to look local.

Reading a register entry for Longueuil: code 450-442 is recorded for Bell Canada, so every 450-442-XXXX number (10,000 possible) descends from that assignment. “Longueuil, Quebec” there names a rate centre, not a municipality, and several area codes overlay it.

Every Longueuil prefix

Each row is an in-service central-office code recorded for Longueuil, with its original holder and year of assignment.

Allocated prefixes

All 41 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec