Area Code Atlas

Arizona area code 602 split to create 520

Area code 602 was split in March 1995, creating area code 520 for southern Arizona, including Tucson and Yuma, to address exhaustion of the original 602 code.

Mandatory use of NPA 520 in rural Arizona

Use of area code 520 became mandatory for rural Arizona on October 22, 1995, ending the permissive dialing period following the split from 602.

Mandatory use of 520 in Flagstaff, Prescott, and Yuma

Mandatory dialing of area code 520 was implemented in Flagstaff, Prescott, and Yuma on June 30, 1996, as part of the phased transition from 602.

Mandatory use of 520 in Tucson

Mandatory use of area code 520 was extended to Tucson on December 31, 1996, completing the transition from 602 in the region.

NPA 928 split from 520

Approval for the split of area code 520 was granted in February 2001, resulting in the creation of area code 928 for northern and western Arizona. The split was implemented to address continued demand for new numbers.

520 NPA Split, Creating 928 NPA (Arizona)

NPA 928 split from 520

Area code 928 was created from a split of area code 520 on June 23, 2001, in response to population growth in Tucson, Yuma, and Flagstaff. The new code covered the northern, eastern, and western portions of Arizona, while 520 continued to serve the southern part of the state.

Permissive dialing period for 928 begins

Permissive dialing for area code 928 began in July 2001, allowing calls to be completed using either 520 or 928 as customers adjusted to the new code.

NPA 928 split from 520

Area code 928 was created in July 2001 from a split of area code 520. The new 928 code covered northern and western Arizona, while 520 retained southeastern Arizona including Tucson.

Transition to 10-digit dialing in 520 due to 988 implementation

Area code 520 transitioned to mandatory ten-digit dialing on October 24, 2021, due to the nationwide designation of 988 as the three-digit code for the National Suicide Prevention Lifeline.