Geographic Regions and Area Codes

The 289 area code covers a diverse range of regions in Ontario, Canada, including the Greater Toronto Area and the Niagara Region. Key cities and towns served by this area code include:

  • Hamilton
  • Mississauga
  • Brampton
  • Niagara Falls
  • St. Catharines
  • Ajax

In addition to the 289 area code, the region is also served by area codes 905, 365, and 742. These area codes collectively cover the Golden Horseshoe region surrounding Lake Ontario, excluding the City of Toronto. This overlay plan ensures comprehensive telecommunication services across the region.