The 514 area code for Montreal was introduced in 1947 and the 819 area code for western and central Quebec introduced in 1957. The 450 area code was adopted in 1998 for the area surrounding Montreal Island. The 438 area code was added to the 514 zone in 2006, and 579 was added to the 450 region in 2010.

The area code 450 is a telephone area code in the Canadian province of Quebec, specifically in the Montreal area. It was created in 1998 as an overlay for the 514 area code, which covers the same geographic region.

Area codes 514, 438, and 263 are telephone area codes of the North American Numbering Plan (NANP) for Montreal and most of its on-island suburbs, specifically the Island of Montreal and Île Perrot in the Canadian province of Quebec.

Area codes 450, 579, and 354 are telephone area codes in the North American Numbering Plan in the Canadian province of Quebec, encompassing the off-island suburbs of Montreal, as well as the rest of the Montérégie region southward to the border with New York state.