This is the National Destination Code(NDC):317 page list. Its detail is as below.
Area code 317 is one of the original 86 area codes created by AT&T and the Bell System in 1947. It originally served the northern two-thirds of Indiana including Indianapolis. In 1997, area code 317 was split, and some of the phone numbers had to be updated to area code 765 on that date. Currently, the largest city it serves is Indianapolis city (balance), IN, and it overlaps coverage areas with area code 463.
