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Phone numbers with the 905 area code prefix originate from the Golden Horseshoe region that surrounds Lake Ontario in Southern Ontario, Canada. This numbering plan area encompasses the Niagara Peninsula, the city of Hamilton, the regional municipalities of Halton, Peel, York, and Durham, and parts of Northumberland County.
The 905 area code operates as part of an overlay numbering plan that serves the same geographic region in Southern Ontario. It works alongside area codes 289, 365, and 742. Area code 905 was established in October 1993. Area code 289 was overlaid on June 9, 2001, which required all local calls to adopt ten-digit dialing. Area code 365 became operational on March 25, 2013, after being introduced on April 13, 2010. Most recently, area code 742 was added to this overlay system on October 16, 2021.
Area code 905 is a General Purpose Code which was placed in service on January 1, 1947.
Our reverse phone lookup will analyze the three-digit prefix of any 905 area code phone number and will show which telecommunications company and rate center it was initially assigned to. This prefix code data may help to determine the U.S. carrier, Ontario geographic region, and local calling area associated with the phone number.
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