Area code 365

365 is an area code for the region around Toronto, from Hamilton and Niagara to Brampton, Markham and Oshawa. It started on March 25, 2013, the same day as Toronto's 437, and shares its ground with 905, 289 and 742. The City of Toronto uses 416, 647, 437 and 942.

• March 25, 2013365 numbers first issued
• 94Exchange areas in the 905 group
• 4Codes sharing the area: 905, 289, 365, 742
• 2029Forecast exhaust year, in November

Where 365 numbers are issued

The administrator lists 94 exchange areas for 365 and the codes that share it, all in Ontario.¹ They wrap around Toronto from Hamilton, Grimsby and Fort Erie through Oakville, Brampton, Markham and Newmarket, then east to Oshawa, Port Hope and Cobourg, and north to Sutton.¹

Toronto isn't on the list. The city has its own group, 416, 647, 437 and 942, with one exchange area: Toronto.¹ A 365 number was issued in one of the surrounding regions.

How the 905 region got its third code

905 split from 416 in 1993, and 289 was laid over it in June 2001.³ In April 2009 the administrator warned that 289 and 905 would run out by February 2014, and the CRTC opened relief planning that May.⁴

The industry committee proposed starting a new code on Oct. 24, 2015. The CRTC moved that up by more than two years. On April 13, 2010, it chose 365, set March 25, 2013 as the start date and reserved 742 for the next round.⁵ It went earlier because a February 2010 forecast still showed exhaust in February 2014.⁴

Exact dates are NANPA in-service dates. The administrator's history gives the month.^2,3

742 followed on Oct. 16, 2021, using the code the CRTC had set aside in 2010.⁶

The 905 region is planning a fifth code

Of Ontario's six area code groups, the 905 region is forecast to run out first: the administrator's July 2026 forecast puts exhaust in November 2029. The region entered relief planning on Sept. 24, 2026.⁷

The code is already picked. In November 2022 the CRTC set aside 537 for the 905, 289, 365 and 742 group, when the forecast pointed to May 2029.⁸ No start date has been approved yet.⁷

Projected exhaust dates from the administrator's status report posted Sept. 29, 2026.⁷

Calls from 365 numbers

The CRTC says callers can change what shows on your call display, including copying the first six digits of your own number so a call looks like it comes from a neighbour.⁹ The code on your screen tells you where a number was issued. It doesn't tell you who is calling.

• Don't trust call display. The Canadian Anti-Fraud Centre says never to assume the number on your screen is accurate, for calls or texts.¹⁰
• Call back on a number you find yourself. If a caller says they're from your bank, a service provider, the police or a government agency, hang up and call the number on your card, your statement or the organization's website.^9,10
• Don't tap links in texts. Forward suspicious texts to 7726 (SPAM), then delete them.^10,11
• Report it. Report fraud to the Canadian Anti-Fraud Centre at 1-888-495-8501 or to your local police, even if you didn't lose money.^9,11
• Cut down on telemarketing. Register your number on the National Do Not Call List and file a complaint about unwanted telemarketing calls.⁹

What people are saying

We read Toronto and Hamilton threads on Reddit from when 365 arrived in 2013.

• "365!? That's a cool area code. I wish Toronto was getting that one and not the suburbs. :("

  Commenter on r/toronto, Feb. 13, 2013¹²

  Toronto got 437 instead, on the same day 365 started: March 25, 2013.²

• "Hamilton getting new area code for mobile phones - 365"

  Post title on r/Hamilton, Feb. 14, 2013¹³

  365 isn't limited to mobile phones. The CRTC laid it over the whole 289 and 905 area for any kind of line.⁵

Claims we checked

• False
  365 covers Toronto, Mississauga, Hamilton, Vaughan and Oshawa.

  Dialaxy's 365 page lists Toronto first, and KrispCall's 365 page also includes it.^14,15 365 belongs to the 905 group. Toronto's only exchange area is in the 416, 647, 437 and 942 group.¹

• False
  Overlay area codes like 365 started being used in 1992.

  KrispCall's 365 page says this.¹⁵ In 1993 the 905 region split from 416 instead.³ Canada's first overlay was Toronto's 647, in March 2001.³

Questions people ask

How we did this

We counted exchange areas in the Canadian Numbering Administrator's listing dated Oct. 7, 2026, and took the history from the administrator's relief history, its archived 289/905 relief report, the NANPA database and CRTC decisions 2010-213, 2020-362 and 2022-308. The forecast and planning status come from the administrator's Sept. 29, 2026 status report. Advice on calls comes only from the CRTC, the Canadian Anti-Fraud Centre and the Government of Canada. Reddit quotes are verbatim, with usernames left out. The clock uses fixed offsets and Ontario's 2026 time rules, not your device's settings.

Area codes change slowly, but new codes, forecasts and time rules do move. Each change goes in the update log below.

Update log

• Oct. 7, 2026, 10:19 p.m. ETFirst published. Data checked against the numbering administrator's and NANPA's files dated Oct. 7, 2026.