area code 602 is an area code of arizona. it was one of the earliest area codes ever created in 1947. it initially covered the entire state of arizona, but after it was split by 520 in 1995, 623 and 480 in 1999, and 928 in 2001, it now covers the phoenix area of the state. sometime in 2023, it will combine with 480 and 623 to form an overlay complex.