Area Code Atlas

Area code 928 assigned to northern, western, and southern Arizona

In 2001, area code 928 was assigned to serve the northern, western, and southern regions of Arizona outside the Phoenix metropolitan area, providing relief from exhaustion of other codes.

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.

Mandatory dialing for 928

The permissive dialing period for area code 928 ended on January 5, 2002, making the use of 928 mandatory for calls in the affected region.

Permissive 10-digit dialing begins in 928

Permissive 10-digit dialing began in area code 928 on April 24, 2021, allowing both 7-digit and 10-digit dialing as part of the transition to support 988 as the National Suicide Prevention Lifeline code.

Mandatory 10-digit dialing implemented in 928

Mandatory 10-digit dialing was implemented in area code 928 on October 24, 2021, to resolve conflicts with the 988 central office code and ensure access to the National Suicide Prevention Lifeline.