Phone prefixes in Caledon, ON

In numbers

In-service prefixes

6

Telephone numbers covered

60,000

Carriers

4

Area codes

4

Provinces and territories

1

First assignment

July 14, 2005

Most recent assignment

April 28, 2025

Caledon’s share of its area codes

Within area code 519, Caledon accounts for only 2 of 779 prefixes (0.3%): the code is dominated by London and spread over 210 rate centres. Within area code 548, Caledon accounts for only 2 of 499 prefixes (0.4%): the code is dominated by London and spread over 170 rate centres. Within area code 226, Caledon accounts for only 1 of 778 prefixes (0.1%): the code is dominated by London and spread over 166 rate centres. Within area code 382, Caledon accounts for only 1 of 60 prefixes (1.7%): the code is dominated by Kitchener-Waterloo and spread over 38 rate centres.

Who holds these numbers

Fibernetics Corporation holds the largest share at 3 prefixes, 50.0% of the total, ahead of 3 other carriers. Code by code: in 519, Bell Canada leads with 1 of 2 prefixes ahead of 1 others; in 548, Fibernetics Corporation leads with 1 of 2 prefixes ahead of 1 others; Fibernetics Corporation is the only holder in 226; Fibernetics Corporation is the only holder in 382. No carrier holds prefixes in every one of Caledon’s 4 area codes, while 3 appear in just one.

Wireless and wireline

None of Caledon’s holders carries a mobility brand in its registered name: all 6 prefixes belong to wireline or wholesale carriers, among them Fibernetics Corporation, Bell Canada, ISP Telecom Inc and Rogers Communications Canada Inc. (Cable). A call showing a Caledon number therefore nominally comes from a landline, cable or VoIP platform rather than a locally assigned cellphone.

How the allocation was built up

Caledon’s dated assignments run from 2005 to 2025. The busiest period was 2020–2024, when 3 prefixes went to 2 carriers. 1 prefixes (17%) carry no date in the register: these are the historic pre-1999 assignments, the wireline bedrock of the rate centre. Since 2020 another 4 prefixes have been added, so the rate centre is still growing.

Caledon’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 Rogers Communications Canada Inc. (Cable) in 2005. The most recent arrivals are ISP Telecom Inc. (2021), Fibernetics Corporation (2020) and Rogers Communications Canada Inc. (Cable) (2005), a sign that new carriers are still asking for numbers in Caledon.

Caledon has just 6 prefixes (60,000 numbers): a very small rate centre, typical of a village or rural area served by a single switching office.

Fibernetics Corporation leads with 50.0% of the prefixes, but 3 competitors have set up in Caledon: a market where the incumbent keeps the edge without exclusivity.

Growth is recent: 80.0% of the dated prefixes were assigned in the last ten years, peaking in 2020–2024. Caledon is among the rate centres where demand for numbers is still rising quickly.

1 undated in the register.

Dialling a Caledon number

Caledon is served by 4 overlaid area codes (519, 548, 226 and 382). A 382 number is no more “out of town” than a 519 one; from abroad, dial +1 and the full ten digits.

The numbering neighbourhood

Caledon shares area codes 519, 548, 226 and 382 with at least 20 other rate centres, including London, Kitchener-Waterloo, Windsor, Guelph, Brantford, Chatham, Sarnia and Hespeler. The largest of them, London, holds 217 prefixes in 226, 382, 519 and 548; the smallest on the list, Essex, has just 16.

What a Caledon number tells you

A number attached to Caledon tells you that its prefix was issued to a carrier for this rate centre in Ontario, most often Fibernetics Corporation. It does not tell you where the handset is today: a subscriber may have ported the number to any of the 4 carriers present here or to a VoIP service usable anywhere. Nor does it tell you who is calling: caller ID can be spoofed, and an Ontario area code is easy to borrow to look local.

Reading a register entry for Caledon: code 548-431 is recorded for Fibernetics Corporation, so every 548-431-XXXX number (10,000 possible) descends from that assignment. “Caledon, Ontario” there names a rate centre, not a municipality, and several area codes overlay it.

Every Caledon prefix

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

Allocated prefixes

All 6 in-service prefixes, grouped by rate centre.

Elsewhere in Ontario