Phone prefixes in Montmagny, QC

In numbers

In-service prefixes

21

Telephone numbers covered

210,000

Carriers

10

Area codes

3

Provinces and territories

1

First assignment

December 3, 1999

Most recent assignment

January 6, 2026

Montmagny’s share of its area codes

Within area code 418, Montmagny accounts for only 11 of 777 prefixes (1.4%): the code is dominated by Quebec and spread over 258 rate centres. Within area code 581, Montmagny accounts for only 7 of 778 prefixes (0.9%): the code is dominated by Quebec and spread over 232 rate centres. Within area code 367, Montmagny accounts for only 3 of 233 prefixes (1.3%): the code is dominated by Quebec and spread over 111 rate centres.

Who holds these numbers

TELUS Quebec holds the largest share at 6 prefixes, 28.6% of the total, ahead of 9 other carriers. Code by code: in 418, TELUS Quebec leads with 4 of 11 prefixes ahead of 4 others; in 581, TELUS Quebec leads with 2 of 7 prefixes ahead of 4 others; in 367, Iristel Inc. leads with 1 of 3 prefixes ahead of 2 others. No carrier holds prefixes in every one of Montmagny’s 3 area codes, while 7 appear in just one.

Wireless and wireline

5 of Montmagny’s 21 prefixes (23.8%) are held by carriers whose registered name marks a wireless business: TELUS Mobility, Bell Mobility, Fido Solutions Inc and Rogers Communications Canada Inc. (Wireless). Wireline prefixes still outnumber them, carried by TELUS Quebec, Videotron Ltd, Iristel Inc and Bell Canada. 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

Montmagny’s dated assignments run from 1999 to 2026. The busiest period was 2005–2009, when 8 prefixes went to 5 carriers. 2 prefixes (10%) carry no date in the register: these are the historic pre-1999 assignments, the wireline bedrock of the rate centre. Since 2020 another 3 prefixes have been added, so the rate centre is still growing.

Montmagny’s oldest prefixes, the ones the register leaves undated, belong to TELUS Quebec: this carrier made up the landscape before competition arrived. The first dated assignment went to TELUS Quebec in 1999. The most recent arrivals are Fibernetics Corporation (2026), Cogeco Connexion Inc. (2025) and Iristel Inc. (2016), a sign that new carriers are still asking for numbers in Montmagny.

Montmagny has only 21 prefixes, or 210,000 numbers: a small rate centre, where the arrival of a single new carrier visibly changes the landscape.

No single carrier dominates Montmagny: the leader, TELUS Quebec, holds only 28.6% of the prefixes against 9 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 15.8% of the dated prefixes are less than ten years old, most having been handed out in 2005–2009, and 2 prefixes go back to the undated monopoly era. New Montmagny numbers mostly come out of blocks that were assigned long ago.

2 undated in the register.

Dialling a Montmagny number

Montmagny is served by 3 overlaid area codes (418, 581 and 367). A 367 number is no more “out of town” than a 418 one; from abroad, dial +1 and the full ten digits.

The numbering neighbourhood

Montmagny shares area codes 418, 581 and 367 with at least 20 other rate centres, including Quebec, Chicoutimi, Alma, Rimouski, Riviere-du-Loup, Thetford Mines, Sainte-Marie-de-Beauce and Levis. The largest of them, Quebec, holds 282 prefixes in 367, 418 and 581; the smallest on the list, Chandler, has just 13.

What a Montmagny number tells you

A number attached to Montmagny tells you that its prefix was issued to a carrier for this rate centre in Quebec, most often TELUS Quebec. It does not tell you where the handset is today: a subscriber may have ported the number to any of the 10 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 Montmagny: code 418-234 is recorded for TELUS Quebec, so every 418-234-XXXX number (10,000 possible) descends from that assignment. “Montmagny, Quebec” there names a rate centre, not a municipality, and several area codes overlay it.

Every Montmagny prefix

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

Had a call from a Montmagny 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 21 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec