Boundary elimination for Southcentral Arizona area codes 480, 602 and 623

The more densely populated area of the state of Arizona with the city of Phoenix and its surrounding large and small communities is currently divided into 3 Numbering Plan Areas as follows:

  • NPA 480, serving parts of Phoenix and other cities and towns including Chandler, Mesa, Scottsdale or Tempe
  • NPA 602 serving mostly the city of Phoenix
  • NPA 623 covering the city of Glendale and other communities west of Phoenix including Avondale, Buckeye or Tolleson

From September 12, 2023 the 3 area codes mentioned above will overlay or will each cover the whole geographic area currently served by the 3 NPAs separately. This measure is to be implemented as the relief method for the 480 NPA.

With the implementation of the new overlay complex 480/602/623 no longer will subscribers to 602 and 623 telephone numbers be able to dial 7 digits when calling locally (10 digit dialing is already in use for area code 480).

Key dates

  • February 11, 2023 – local calls originating in NPAs 602 and 623 may be dialed using both 7 and 10 digits (permissive dialing)
  • August 12, 2023 – mandatory 10 digit dialing begins for the entire area
  • September 12, 2023 – boundary elimination date and birth of the new overlay complex 480/602/623

See official NANPA document announcing the change with map of the area (PDF document)

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