Phone prefixes in Stouffville, ON

In numbers

In-service prefixes

17

Telephone numbers covered

170,000

Carriers

14

Area codes

4

Provinces and territories

1

First assignment

December 9, 2004

Most recent assignment

May 2, 2025

Stouffville’s share of its area codes

Within area code 289, Stouffville accounts for only 6 of 772 prefixes (0.8%): the code is dominated by Hamilton and spread over 87 rate centres. Within area code 365, Stouffville accounts for only 6 of 702 prefixes (0.9%): the code is dominated by Markham and spread over 88 rate centres. Within area code 905, Stouffville accounts for only 3 of 773 prefixes (0.4%): the code is dominated by Hamilton and spread over 94 rate centres. Within area code 742, Stouffville accounts for only 2 of 146 prefixes (1.4%): the code is dominated by Brampton and spread over 68 rate centres.

Who holds these numbers

Bell Canada holds the largest share at 2 prefixes, 11.8% of the total, ahead of 13 other carriers. Code by code: in 289, Fibernetics Corporation leads with 2 of 6 prefixes ahead of 4 others; in 365, Beanfield Technologies Inc. leads with 1 of 6 prefixes ahead of 5 others; in 905, Bell Canada leads with 2 of 3 prefixes ahead of 1 others; in 742, Iristel Inc. leads with 1 of 2 prefixes ahead of 1 others. No carrier holds prefixes in every one of Stouffville’s 4 area codes, while 13 appear in just one.

Wireless and wireline

None of Stouffville’s holders carries a mobility brand in its registered name: all 17 prefixes belong to wireline or wholesale carriers, among them Bell Canada, Fibernetics Corporation, Iristel Inc and Beanfield Technologies Inc. A call showing a Stouffville number therefore nominally comes from a landline, cable or VoIP platform rather than a locally assigned cellphone.

How the allocation was built up

Stouffville’s dated assignments run from 2004 to 2025. The busiest period was 2015–2019, when 6 prefixes went to 6 carriers. 2 prefixes (12%) 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.

Stouffville’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 2004. The most recent arrivals are FGLTEL Inc. (2022), Beanfield Technologies Inc. (2022) and TekSavvy Solutions Inc (2021), a sign that new carriers are still asking for numbers in Stouffville.

Stouffville has only 17 prefixes, or 170,000 numbers: a small rate centre, where the arrival of a single new carrier visibly changes the landscape.

No single carrier dominates Stouffville: the leader, Bell Canada, holds only 11.8% of the prefixes against 13 competitors, a sign of a highly fragmented market where cable companies, mobility brands and VoIP providers weigh as much as the incumbent.

Demand remains steady: 26.7% of the dated prefixes go back to the last ten years, the most active period being 2015–2019. The rate centre is growing at a regular rather than explosive pace.

2 undated in the register.

Dialling a Stouffville number

Stouffville is served by 4 overlaid area codes (289, 365, 905 and 742). A 742 number is no more “out of town” than a 289 one; from abroad, dial +1 and the full ten digits.

The numbering neighbourhood

Stouffville shares area codes 289, 365, 905 and 742 with at least 20 other rate centres, including Hamilton, Brampton, Oshawa, St. Catharines-Thorold, Oakville, Markham, Ajax-Pickering and Cooksville. The largest of them, Hamilton, holds 221 prefixes in 289, 365, 742 and 905; the smallest on the list, Dunnville, has just 28.

What a Stouffville number tells you

A number attached to Stouffville tells you that its prefix was issued to a carrier for this rate centre in Ontario, 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 14 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 Stouffville: code 905-640 is recorded for Bell Canada, so every 905-640-XXXX number (10,000 possible) descends from that assignment. “Stouffville, Ontario” there names a rate centre, not a municipality, and several area codes overlay it.

Every Stouffville prefix

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

Allocated prefixes

All 17 in-service prefixes, grouped by rate centre.

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