The addition of the 480 and 623 area codes in 1999 caused some initial confusion. The 520 area code was designated for areas outside Maricopa County in 1995. The 520 was split to add a 928 area code ...

Tucson's area code 520 was the most common local number used by robocallers in the U.S. last month, with more than 8.6 million calls generated, TNS data shows. Phoenix's 602, the East Valley's 480 and ...