Phone prefixes in Aurora, ON

In numbers

In-service prefixes

47

Telephone numbers covered

470,000

Carriers

19

Area codes

4

Provinces and territories

1

First assignment

January 31, 2000

Most recent assignment

November 19, 2025

Aurora’s share of its area codes

Within area code 365, Aurora accounts for only 18 of 702 prefixes (2.6%): the code is dominated by Markham and spread over 88 rate centres. Within area code 289, Aurora accounts for only 15 of 772 prefixes (1.9%): the code is dominated by Hamilton and spread over 87 rate centres. Within area code 905, Aurora accounts for only 12 of 773 prefixes (1.6%): the code is dominated by Hamilton and spread over 94 rate centres. Within area code 742, Aurora 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

Iristel Inc. holds the largest share at 12 prefixes, 25.5% of the total, ahead of 18 other carriers. Code by code: in 365, Iristel Inc. leads with 10 of 18 prefixes ahead of 8 others; in 289, Rogers Communications Canada Inc. (Wireless) leads with 3 of 15 prefixes ahead of 9 others; in 905, Bell Canada leads with 7 of 12 prefixes ahead of 2 others; in 742, Beanfield Technologies Inc. leads with 1 of 2 prefixes ahead of 1 others. No carrier holds prefixes in every one of Aurora’s 4 area codes, while 14 appear in just one.

Wireless and wireline

9 of Aurora’s 47 prefixes (19.1%) are held by carriers whose registered name marks a wireless business: Rogers Communications Canada Inc. (Wireless), Bell Mobility, TELUS Mobility and Fido Solutions Inc. Wireline prefixes still outnumber them, carried by Iristel Inc, Bell Canada, Rogers Communications Canada Inc. (Cable) and Fibernetics Corporation. 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

Aurora’s dated assignments run from 2000 to 2025. The busiest period was 2005–2009, when 12 prefixes went to 10 carriers. 5 prefixes (11%) carry no date in the register: these are the historic pre-1999 assignments, the wireline bedrock of the rate centre. Since 2020 another 12 prefixes have been added, so the rate centre is still growing.

Aurora’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 2000. The most recent arrivals are FGLTEL Inc. (2022), Beanfield Technologies Inc. (2021) and TekSavvy Solutions Inc (2021), a sign that new carriers are still asking for numbers in Aurora.

Aurora’s 47 prefixes provide 470,000 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 Aurora: the leader, Iristel Inc., holds only 25.5% of the prefixes against 18 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: 28.6% of the dated prefixes go back to the last ten years, the most active period being 2005–2009. The rate centre is growing at a regular rather than explosive pace.

The register also shows 2 prefixes assigned but not yet in service in Aurora (Rogers Communications Canada Inc. (Wireless) and TELUS Mobility): numbers that will start showing up on call displays in the coming months.

5 undated in the register.

Dialling a Aurora number

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

The numbering neighbourhood

Aurora shares area codes 365, 289, 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, Maple, has just 28.

What a Aurora number tells you

A number attached to Aurora tells you that its prefix was issued to a carrier for this rate centre in Ontario, most often Iristel Inc.. It does not tell you where the handset is today: a subscriber may have ported the number to any of the 19 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 Aurora: code 365-803 is recorded for Iristel Inc., so every 365-803-XXXX number (10,000 possible) descends from that assignment. “Aurora, Ontario” there names a rate centre, not a municipality, and several area codes overlay it.

Every Aurora prefix

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

Allocated prefixes

All 47 in-service prefixes, grouped by rate centre.

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