Phone prefixes in Granby, QC

In numbers

In-service prefixes

52

Telephone numbers covered

520,000

Carriers

16

Area codes

3

Provinces and territories

1

First assignment

February 10, 2000

Most recent assignment

August 21, 2025

Granby’s share of its area codes

Within area code 450, Granby accounts for only 31 of 775 prefixes (4.0%): the code is dominated by Granby and spread over 129 rate centres. Within area code 579, Granby accounts for only 20 of 644 prefixes (3.1%): the code is dominated by Granby and spread over 126 rate centres. Within area code 354, Granby accounts for only 1 of 56 prefixes (1.8%): the code is dominated by Valleyfield and spread over 49 rate centres.

Who holds these numbers

Bell Canada holds the largest share at 10 prefixes, 19.2% of the total, ahead of 15 other carriers. Code by code: in 450, Bell Canada leads with 9 of 31 prefixes ahead of 10 others; in 579, Videotron Ltd. leads with 3 of 20 prefixes ahead of 11 others; Cogeco Connexion Inc. is the only holder in 354. No carrier holds prefixes in every one of Granby’s 3 area codes, while 8 appear in just one.

Wireless and wireline

16 of Granby’s 52 prefixes (30.8%) 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 IXICA Communications 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

Granby’s dated assignments run from 2000 to 2025. The busiest period was 2015–2019, when 12 prefixes went to 10 carriers. 11 prefixes (21%) 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.

Granby’s oldest prefixes, the ones the register leaves undated, belong to Bell Canada, TELUS Mobility and Rogers Communications Canada Inc. (Wireless): 4 carriers made up the landscape before competition arrived. The first dated assignment went to TELUS Mobility in 2000. The most recent arrivals are Cogeco Connexion Inc. (2025), IXICA Communications Inc. (2021) and Cooptel (2018), a sign that new carriers are still asking for numbers in Granby.

Granby’s 52 prefixes provide 520,000 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 Granby: the leader, Bell Canada, holds only 19.2% of the prefixes against 15 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 14.6% 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 Granby numbers mostly come out of blocks that were assigned long ago.

11 undated in the register.

Dialling a Granby number

Granby 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

Granby shares area codes 450, 579 and 354 with at least 20 other rate centres, including Joliette, St-Jerome, St-Hyacinthe, Longueuil, Ste-Therese, St-Lambert, Sorel and Pont-Viau. The largest of them, Joliette, holds 48 prefixes in 354, 450 and 579; the smallest on the list, St-Vincent-de-Paul, has just 17.

What a Granby number tells you

A number attached to Granby 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 16 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 Granby: code 450-360 is recorded for Bell Canada, so every 450-360-XXXX number (10,000 possible) descends from that assignment. “Granby, Quebec” there names a rate centre, not a municipality, and several area codes overlay it.

Every Granby prefix

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

Allocated prefixes

All 52 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec