ONTARIO · AREA CODE GUIDE
289, 365, 742, and 905 area codes location: Hamilton, Ontario
- Local date and time
- Eastern Time
Map data: UCLA Geoportal (2015) · NANPA · Statistics Canada (Open Government Licence – Canada) · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 365 area code map
289, 365, 742, and 905 area codes at a glance
- Province
- Ontario
- Primary cities
- Hamilton, Oshawa, and Brampton
- Time zone
- Eastern Time
An area code does not show where a caller is now.
| Area code | Started service | Parent code | New code planned |
|---|---|---|---|
| 289 | 905 | No, as of 22 September 2026 | |
| 365 | 905 | No, as of 22 September 2026 | |
| 742 | 905 | No, as of 22 September 2026 | |
| 905 | 416 | No, as of 22 September 2026 |
History
Communities covered
These are telephone exchange areas, which follow the phone network rather than city limits.
- Hamilton
- Oshawa
- St. Catharines-Thorold
- Brampton
- Cooksville
- Oakville
- Streetsville
- Thornhill
- Unionville
- Malton
- Burlington
- Ajax-Pickering
- Newmarket
- Milton
- Aurora
- Richmond Hill
- Markham
- Niagara Falls
- South Pickering
- Woodbridge
- Clarkson
- Cobourg
- Welland
- Whitby
- Oak Ridges
69 more communities
- Port Credit
- Caledon East
- Maple
- Beeton
- Castlemore
- Fort Erie
- Gormley
- Keswick
- Georgetown
- Stoney Creek
- Bolton
- Bowmanville
- Bradford
- Brooklin
- Claremont
- Dunnville
- Stouffville
- Uxbridge
- Ancaster
- Bethesda
- Dundas
- Grimsby
- Hampton
- King City
- Kleinburg
- Mount Albert
- Newcastle
- Niagara-On-The-Lake
- Nobleton
- Orono
- Palgrave
- Port Colborne
- Port Hope
- Port Perry
- Queensville
- Schomberg
- Snelgrove
- Sutton
- Tottenham
- Victoria
- Waterdown
- Beamsville
- Binbrook
- Blackstock
- Caledonia
- Campbellville
- Castleton
- Cayuga
- Colborne
- Cold Springs
- Fisherville
- Freelton
- Garden Hill
- Grafton
- Hagersville
- Mount Hope
- Newtonville
- Pelham
- Port Robinson
- Ridgeway
- Roseneath
- Selkirk
- Stevensville
- Vineland
- Wainfleet
- Welcome
- Wellandport
- West Lincoln
- Winona
Sources: NANPA area code listing, CNA code status. Checked .
Business phone numbers in area codes 289, 365, 742, and 905, answered by an AI agent
A local number for Hamilton, Oshawa, and Brampton, Ontario, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.