Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: TCSNAZCRDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
520-228 A Tucson AZ 9636 QWEST CORPORATION 668      
520-512 A Tucson AZ 9636 QWEST CORPORATION 668      
520-513 A Tucson AZ 9636 QWEST CORPORATION 668      
520-514 A Tucson AZ 9636 QWEST CORPORATION 668      
520-519 A Tucson AZ 9636 QWEST CORPORATION 668      
520-570 A Tucson AZ 9636 QWEST CORPORATION 668      
520-571 A Tucson AZ 9636 QWEST CORPORATION 668      
520-584 A Tucson AZ 9636 QWEST CORPORATION 668      
520-745 A Tucson AZ 9636 QWEST CORPORATION 668      
520-747 A Tucson AZ 9636 QWEST CORPORATION 668      
520-748 A Tucson AZ 9636 QWEST CORPORATION 668      
520-750 A Tucson AZ 9636 QWEST CORPORATION 668      
520-790 A Tucson AZ 9636 QWEST CORPORATION 668      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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