Area Code 289
Area Code 289 is in Ontario
(289 and 365 and 742 and 905) - (416 and 437 and 647)
(226 and 519 and 548) - (343 and 613) - (249 and 705)
Area Code 289 History:
Area code 289 was officially put into service. Area code 289 is an overlay of area code 905.
Area code 365 was officially put into service as an overlay of area codes 905 and 289 on 03/25/2013.
Area code 742 was officially put into service as an overlay of 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 289 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.