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Area code 604 is a telephone area code in the North American Numbering Plan for the southwestern corner of British Columbia, Canada. The numbering plan area comprises Metro Vancouver, the Sunshine Coast, Howe Sound / Sea-to-Sky Corridor, Fraser Valley, and the lower Fraser Canyon regions. The area code is one of the nine original North American area codes assigned to Canada in 1947. The numbering plan area is also served by area codes 236, 257, 672, and 778 in an overlay complex that extends to the entire province.