<P> Area codes 905 , 289 , and 365 are overlay area codes in the North American Numbering Plan ( NANP ) in Southern Ontario , Canada , particularly covering the Niagara Peninsula , the city of Hamilton , Halton Region , Peel Region , York Region , and Durham Region . Area code 905 was assigned on October 4 , 1993 , as a split from area code 416 . After 289 was overlaid on June 9 , 2001 , all local calls required ten - digit dialling . On April 13 , 2010 , the Canadian Radio - television and Telecommunications Commission ( CRTC ) introduced the overlay area code 365 , which became operational on March 25 , 2013 . The three area codes are expected to become exhausted by March 2025 . </P>
<P> Area codes 905 , 289 , and 365 are overlay area codes in the North American Numbering Plan ( NANP ) in Southern Ontario , Canada , particularly covering the Niagara Peninsula , the city of Hamilton , Halton Region , Peel Region , York Region , and Durham Region . Area code 905 was assigned on October 4 , 1993 , as a split from area code 416 . After 289 was overlaid on June 9 , 2001 , all local calls required ten - digit dialling . On April 13 , 2010 , the Canadian Radio - television and Telecommunications Commission ( CRTC ) introduced the overlay area code 365 , which became operational on March 25 , 2013 . The three area codes are expected to become exhausted by March 2025 . </P>
where is area code 905 in united states
where is area code 905 in united states
Southern Ontario , Canada ,
Southern Ontario , Canada ,