Area Code 742
Area Code 742 Assignment is in Ontario
(289 and 365 and 742 and 905) - (416 and 437 and 647)
(226 and 519 and 548) - (343 and 613 and 753) - (249 and 683 and 705)
Area Code 742 History:
Area code 742 was put into service as a distributed overlay covering the existing area codes 905, 289, and 365 on 10/16/2021. Ten digit dialing (area code + seven digit number) is necessary in the 905/289/365/742 overlay because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
Major cities or places in Ontario within area code 742 include:
Area codes 905, 289, 365 and 742 cover a portion of southern Ontario including Niagara Falls and the Greater Toronto Area, and the larger communities of Ajax, Ancaster, Aurora, Brampton, Burlington, Caledon, Cobourg, Dunnville, Fort Erie, Georgetown, Hamilton, King Township, Maple, Markham, Milton, Mississauga, Newmarket, Oshawa, Richmond Hill, St. Catharines, Stoney Creek, Thornhill, Unionville, Welland, Woodbridge and many smaller surrounding communities in the area codes 905 and 289 overlay service area.