Phone prefixes in Terrebonne, QC

In numbers

In-service prefixes

17

Telephone numbers covered

170,000

Carriers

8

Area codes

2

Provinces and territories

1

First assignment

April 30, 2004

Most recent assignment

April 20, 2023

Terrebonne’s share of its area codes

Within area code 450, Terrebonne accounts for only 11 of 775 prefixes (1.4%): the code is dominated by Granby and spread over 129 rate centres. Within area code 579, Terrebonne accounts for only 6 of 644 prefixes (0.9%): the code is dominated by Granby and spread over 126 rate centres.

Who holds these numbers

Bell Canada holds the largest share at 5 prefixes, 29.4% of the total, ahead of 7 other carriers. Code by code: in 450, Bell Canada leads with 4 of 11 prefixes ahead of 4 others; in 579, Fibernetics Corporation leads with 2 of 6 prefixes ahead of 4 others. 2 carriers hold prefixes in every one of Terrebonne’s 2 area codes, while 6 appear in just one.

Wireless and wireline

1 of Terrebonne’s 17 prefixes (5.9%) 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, Fibernetics Corporation and Iristel Inc. 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

Terrebonne’s dated assignments run from 2004 to 2023. The busiest period was 2010–2014, when 5 prefixes went to 4 carriers. 4 prefixes (24%) 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.

Terrebonne’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 Videotron Ltd. in 2004. The most recent arrivals are Fibernetics Corporation (2021), Bell Canada (2016) and Fido Solutions Inc. (2014), a sign that new carriers are still asking for numbers in Terrebonne.

Terrebonne has only 17 prefixes, or 170,000 numbers: a small rate centre, where the arrival of a single new carrier visibly changes the landscape.

No single carrier dominates Terrebonne: the leader, Bell Canada, holds only 29.4% of the prefixes against 7 competitors, a sign of a highly fragmented market where cable companies, mobility brands and VoIP providers weigh as much as the incumbent.

Allocation is mature: only 15.4% of the dated prefixes are less than ten years old, most having been handed out in 2010–2014, and 4 prefixes go back to the undated monopoly era. New Terrebonne numbers mostly come out of blocks that were assigned long ago.

The register also shows 1 prefix assigned but not yet in service in Terrebonne (Cogeco Connexion Inc): numbers that will start showing up on call displays in the coming months.

4 undated in the register.

Dialling a Terrebonne number

Terrebonne is served by 2 overlaid area codes (450 and 579). A 579 number is no more “out of town” than a 450 one; from abroad, dial +1 and the full ten digits.

The numbering neighbourhood

Terrebonne shares area codes 450 and 579 with at least 20 other rate centres, including Granby, Joliette, St-Jerome, St-Hyacinthe, Longueuil, Ste-Therese, Pont-Viau and Sorel. The largest of them, Granby, holds 51 prefixes in 450 and 579; the smallest on the list, Lachute, has just 17.

What a Terrebonne number tells you

A number attached to Terrebonne 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 8 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 Terrebonne: code 450-471 is recorded for Bell Canada, so every 450-471-XXXX number (10,000 possible) descends from that assignment. “Terrebonne, Quebec” there names a rate centre, not a municipality, and several area codes overlay it.

Every Terrebonne prefix

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

Had a call from a Terrebonne number?

No clear pattern in reports on these numbers yet. If a call worried you:

1. Call back on a number you trust

   If a caller says they are your bank, the Canada Revenue Agency, a courier or your phone company, hang up and call the organization on the number from its website or your statement, never the number that called you. Caller ID can be faked.

2. Report the fraud

   Report the call or text to the Canadian Anti-Fraud Centre online or at 1-888-495-8501. If you lost money or gave out personal details, tell your bank first, then your local police.

   Report to the Canadian Anti-Fraud Centre ↗

3. Register on the National Do Not Call List

   Registering a landline or mobile on the National DNCL is free. Registered charities, political parties, newspapers and companies you already do business with may still call.

   National Do Not Call List ↗Who can still call you ↗

4. Forward suspicious texts to 7726

   Forward a scam or spam text to 7726 (SPAM on the keypad). It's free, and your carrier uses it to block the sender. Don't tap links or reply.

   Get Cyber Safe: forwarding to 7726 ↗

Allocated prefixes

All 17 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec