The U.S. state of Arizona is served by five telephone area codes in three numbering plan areas: 602 was the original area code for Arizona, and was split in 1995 into 602, serving metropolitan Phoenix, and 520, serving the remainder of the state.
[1] In 1999, 602 was split into 480, 602, and 623,[2] which were recombined in 2023.
[3] 520 was split in 2001 to form area code 928.
[4]