Phone prefixes in Berthierville, QC

In numbers

In-service prefixes

9

Telephone numbers covered

90,000

Carriers

6

Area codes

3

Provinces and territories

1

First assignment

August 21, 2013

Most recent assignment

August 20, 2025

Berthierville’s share of its area codes

Within area code 579, Berthierville accounts for only 7 of 644 prefixes (1.1%): the code is dominated by Granby and spread over 126 rate centres. Within area code 354, Berthierville accounts for only 1 of 56 prefixes (1.8%): the code is dominated by Valleyfield and spread over 49 rate centres. Within area code 450, Berthierville accounts for only 1 of 775 prefixes (0.1%): the code is dominated by Granby and spread over 129 rate centres.

Who holds these numbers

ISP Telecom Inc. holds the largest share at 2 prefixes, 22.2% of the total, ahead of 5 other carriers. Code by code: in 579, ISP Telecom Inc. leads with 2 of 7 prefixes ahead of 3 others; Cogeco Connexion Inc. is the only holder in 354; Bell Canada is the only holder in 450. No carrier holds prefixes in every one of Berthierville’s 3 area codes, while 6 appear in just one.

Wireless and wireline

None of Berthierville’s holders carries a mobility brand in its registered name: all 9 prefixes belong to wireline or wholesale carriers, among them ISP Telecom Inc, TELUS Quebec, Videotron Ltd and Bell Canada. A call showing a Berthierville number therefore nominally comes from a landline, cable or VoIP platform rather than a locally assigned cellphone.

How the allocation was built up

Berthierville’s dated assignments run from 2013 to 2025. The busiest period was 2015–2019, when 4 prefixes went to 3 carriers. 1 prefixes (11%) carry no date in the register: these are the historic pre-1999 assignments, the wireline bedrock of the rate centre. Since 2020 another 2 prefixes have been added, so the rate centre is still growing.

Berthierville’s oldest prefixes, the ones the register leaves undated, belong to Bell Canada: this carrier made up the landscape before competition arrived. The first dated assignment went to ISP Telecom Inc. in 2013. The most recent arrivals are Cogeco Connexion Inc. (2025), Cooptel (2023) and TELUS Quebec (2016), a sign that new carriers are still asking for numbers in Berthierville.

Berthierville has just 9 prefixes (90,000 numbers): a very small rate centre, typical of a village or rural area served by a single switching office.

No single carrier dominates Berthierville: the leader, ISP Telecom Inc., holds only 22.2% of the prefixes against 5 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: 25.0% of the dated prefixes go back to the last ten years, the most active period being 2015–2019. The rate centre is growing at a regular rather than explosive pace.

1 undated in the register.

Dialling a Berthierville number

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

The numbering neighbourhood

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

What a Berthierville number tells you

A number attached to Berthierville tells you that its prefix was issued to a carrier for this rate centre in Quebec, most often ISP Telecom Inc.. It does not tell you where the handset is today: a subscriber may have ported the number to any of the 6 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 Berthierville: code 579-263 is recorded for ISP Telecom Inc., so every 579-263-XXXX number (10,000 possible) descends from that assignment. “Berthierville, Quebec” there names a rate centre, not a municipality, and several area codes overlay it.

Every Berthierville prefix

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

Allocated prefixes

All 9 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec