Area codes 905, 289, and 365, Telephone area codes in Ontario, Canada
Area codes 905, 289, and 365 are telephone area codes serving the Golden Horseshoe region of Ontario in Canada.
The 905 code was introduced in 1993 as a split from area code 416, and overlays with 289 and 365 were added in 2001 and 2013 respectively.
These area codes cover a culturally diverse region, including cities like Hamilton, Niagara Falls, and most of suburban Toronto.
When dialing these numbers locally, all 10 digits must be dialed.
Area code 742 is set to overlay the region when the existing codes exhaust.
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