ONTARIO · AREA CODE GUIDE

742 area code location: Hamilton and Oshawa, Ontario

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742 area code: OntarioCities marked: Hamilton, Oshawa, Brampton, Cooksville.Boundaries are approximate; area codes don't always follow city or county lines. Map data: the Homeland Security Infrastructure Program (HSIP, 2010) and the North American Numbering Plan Administrator (NANPA), checked 26 September 2026; Statistics Canada (Open Government Licence – Canada); US Census Bureau.

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742 area code at a glance

Country and calling code: Canada (+1)
In service since: 16 October 2021
Parent code: 905
New code planned: No, as of 22 September 2026

An area code does not show where a caller is now.

Sources: NANPA area code listing, CNA code status. Checked 2026-09-26.

History

9 June 2001: 289 added as an overlay on 905
25 March 2013: 365 added as an overlay on 905
16 October 2021: 742 added as an overlay on 905

Time zone

Eastern Time: Standard time UTC−05:00; Daylight saving time UTC−04:00

Where 742 reaches

742 numbers are issued across 94 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.

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

Notable places in 742

Place	Where	What it is
Toronto Pearson International Airport	3.3 km from Malton	Airport
McMaster University	2.2 km from Dundas	University
Brock University	9.3 km from Port Robinson	University
John C. Munro Hamilton International Airport	7.4 km from Ancaster	Airport
HMCS Haida	7.0 km from Dundas	Museum
Hamilton Stadium	9.3 km from Dundas	Stadium
Canada's Wonderland	6.5 km from Kleinburg	Amusement park
Ontario Tech University	5.2 km from Whitby	University
TD Coliseum	5.8 km from Dundas	Arena
Buttonville Municipal Airport	4.0 km from Unionville	Airport

Also serving this area

Questions about 742

Where is the 742 area code?

742 is in Ontario. Its numbers are issued in Hamilton, Oshawa, Brampton, and 91 other communities.

What time zone is area code 742 in?

742 is in Eastern Time. Daylight saving time is observed.

Is 742 an overlay?

Yes. 742 was added as an overlay on 905 on 16 October 2021.

Business phone numbers in area code 742, 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.

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