Phone prefixes in Lambton, QC

In numbers

In-service prefixes

4

Telephone numbers covered

40,000

Carriers

4

Area codes

3

Provinces and territories

1

First assignment

June 4, 2020

Most recent assignment

August 26, 2025

Lambton’s share of its area codes

Within area code 581, Lambton accounts for only 2 of 778 prefixes (0.3%): the code is dominated by Quebec and spread over 232 rate centres. Within area code 367, Lambton accounts for only 1 of 232 prefixes (0.4%): the code is dominated by Quebec and spread over 110 rate centres. Within area code 418, Lambton accounts for only 1 of 777 prefixes (0.1%): the code is dominated by Quebec and spread over 258 rate centres.

Who holds these numbers

Cogeco Connexion Inc. holds the largest share at 1 prefixes, 25.0% of the total, ahead of 3 other carriers. Code by code: in 581, TELUS Quebec leads with 1 of 2 prefixes ahead of 1 others; Cogeco Connexion Inc. is the only holder in 367; La Compagnie de Telephone de Lambton Inc. is the only holder in 418. No carrier holds prefixes in every one of Lambton’s 3 area codes, while 4 appear in just one.

Wireless and wireline

None of Lambton’s holders carries a mobility brand in its registered name: all 4 prefixes belong to wireline or wholesale carriers, among them Cogeco Connexion Inc, La Compagnie de Telephone de Lambton Inc, TELUS Quebec and Videotron Ltd. A call showing a Lambton number therefore nominally comes from a landline, cable or VoIP platform rather than a locally assigned cellphone.

How the allocation was built up

Lambton’s dated assignments run from 2020 to 2025. The busiest period was 2020–2024, when 2 prefixes went to 2 carriers. 1 prefixes (25%) 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.

Lambton’s oldest prefixes, the ones the register leaves undated, belong to La Compagnie de Telephone de Lambton Inc: this carrier made up the landscape before competition arrived. The first dated assignment went to TELUS Quebec in 2020. The most recent arrivals are Cogeco Connexion Inc. (2025), Videotron Ltd. (2020) and TELUS Quebec (2020), a sign that new carriers are still asking for numbers in Lambton.

Lambton has just 4 prefixes (40,000 numbers): a very small rate centre, typical of a village or rural area served by a single switching office.

No single carrier dominates Lambton: the leader, Cogeco Connexion Inc., holds only 25.0% of the prefixes against 3 competitors, a sign of a highly fragmented market where cable companies, mobility brands and VoIP providers weigh as much as the incumbent.

Growth is recent: 100.0% of the dated prefixes were assigned in the last ten years, peaking in 2020–2024. Lambton is among the rate centres where demand for numbers is still rising quickly.

1 undated in the register.

Dialling a Lambton number

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

The numbering neighbourhood

Lambton shares area codes 581, 367 and 418 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, Saint-Henri-de-Levis, has just 16.

What a Lambton number tells you

A number attached to Lambton tells you that its prefix was issued to a carrier for this rate centre in Quebec, most often Cogeco Connexion Inc.. 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 a Quebec area code is easy to borrow to look local.

Reading a register entry for Lambton: code 367-294 is recorded for Cogeco Connexion Inc., so every 367-294-XXXX number (10,000 possible) descends from that assignment. “Lambton, Quebec” there names a rate centre, not a municipality, and several area codes overlay it.

Every Lambton prefix

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

Allocated prefixes

All 4 in-service prefixes, grouped by rate centre.

Elsewhere in Quebec