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]
^"New 520 area code mandatory Saturday". Arizona Republic. Phoenix, Arizona. October 20, 1995. p. E1.
Archived from the original on November 27, 2021. Retrieved November 27, 2021 – via Newspapers.com.