Phone prefixes in St-Jerome, QC

In numbers

In-service prefixes

46

Telephone numbers covered

460,000

Carriers

12

Area codes

3

Provinces and territories

1

First assignment

August 23, 2000

Most recent assignment

February 1, 2023

St-Jerome’s share of its area codes

Within area code 450, St-Jerome accounts for only 28 of 775 prefixes (3.6%): the code is dominated by Granby and spread over 129 rate centres. Within area code 579, St-Jerome accounts for only 17 of 644 prefixes (2.6%): the code is dominated by Granby and spread over 126 rate centres. Within area code 354, St-Jerome accounts for only 1 of 57 prefixes (1.8%): the code is dominated by Valleyfield and spread over 50 rate centres.

Who holds these numbers

Bell Canada holds the largest share at 11 prefixes, 23.9% of the total, ahead of 11 other carriers. Code by code: in 450, Bell Canada leads with 10 of 28 prefixes ahead of 8 others; in 579, Videotron Ltd. leads with 3 of 17 prefixes ahead of 9 others; TELUS Mobility is the only holder in 354. 1 carrier holds prefixes in every one of St-Jerome’s 3 area codes, while 5 appear in just one.

Wireless and wireline

15 of St-Jerome’s 46 prefixes (32.6%) are held by carriers whose registered name marks a wireless business: TELUS Mobility, Bell Mobility, Rogers Communications Canada Inc. (Wireless) and Fido Solutions Inc. Wireline prefixes still outnumber them, carried by Bell Canada, Videotron Ltd, Iristel Inc and TELUS Quebec. 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

St-Jerome’s dated assignments run from 2000 to 2023. The busiest period was 2015–2019, when 11 prefixes went to 8 carriers. 11 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.

St-Jerome’s oldest prefixes, the ones the register leaves undated, belong to Bell Canada, Fido Solutions Inc and Rogers Communications Canada Inc. (Wireless): these carriers made up the landscape before competition arrived. The first dated assignment went to Fido Solutions Inc. in 2000. The most recent arrivals are Distributel (2018), Fibernetics Corporation (2015) and Comwave Networks (2014), a sign that new carriers are still asking for numbers in St-Jerome.

St-Jerome’s 46 prefixes provide 460,000 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 St-Jerome: the leader, Bell Canada, holds only 23.9% of the prefixes against 11 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 5.7% of the dated prefixes are less than ten years old, most having been handed out in 2015–2019, and 11 prefixes go back to the undated monopoly era. New St-Jerome numbers mostly come out of blocks that were assigned long ago.

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

11 undated in the register.

Dialling a St-Jerome number

St-Jerome 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

St-Jerome shares area codes 450, 579 and 354 with at least 20 other rate centres, including Granby, Joliette, St-Hyacinthe, Longueuil, Ste-Therese, St-Lambert, Pont-Viau and Sorel. 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 St-Jerome number tells you

A number attached to St-Jerome 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 12 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 St-Jerome: code 450-431 is recorded for Bell Canada, so every 450-431-XXXX number (10,000 possible) descends from that assignment. “St-Jerome, Quebec” there names a rate centre, not a municipality, and several area codes overlay it.

Every St-Jerome prefix

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

Had a call from a St-Jerome 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 46 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec