Ontario
(365) Area Code 365 — Hamilton, Ontario
365 Area Code – Hamilton, Ontario: Location, Time Zone & History
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Map of Area Code 365
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History & Cultural Notes
Ontario's Golden Horseshoe, the dense arc of suburban municipalities wrapping around Toronto, is known informally as "the 905" or the "905 belt," a nickname that has stuck even as the region has grown to share four area codes. It began with 905 itself, split from 416 on October 11, 1993; grew to include the 289 overlay on June 9, 2001, the first in the territory to use ten-digit dialing; and then, on March 25, 2013, added 365 as a further relief overlay covering the same ground as 905 and 289. Because the region had already used ten-digit dialing since 2001, 365 was able to launch without a permissive-dialing transition period. A fourth code, 742, followed on October 16, 2021, after regulators projected the existing codes would exhaust their central office codes by late 2022.
The 905/289/365/742 territory, served primarily from Hamilton with Mississauga as its largest city, is frequently cited as a bellwether area in Canadian federal and provincial elections. Its economy includes:
- Advanced manufacturing and steel
- Logistics and distribution
- Financial services back-office operations
- Higher education and research
- Wine and agriculture in the Niagara area
Communities across the territory include Mississauga, Brampton, Burlington, Oakville, and St. Catharines, bordered by area codes 416, 519, 705, 613, and 716.