This is the National Destination Code(NDC):604 page list. Its detail is as below.
Area code 604 is one of the original 86 area codes created by AT&T and the Bell System in 1947. It originally served the entire province of British Columbia. In 1996, area code 250 was created as an overlay to area code 604. In 2001, area code 778 was created as an overlay to area code 604. In 2013, area code 236 was created as an overlay to area code 604. Currently, the largest city it serves is Vancouver, BC, and it overlaps coverage areas with area code 778.
