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: TCSNAZEADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
520-318 A Tucson AZ 9636 QWEST CORPORATION 668      
520-319 A Tucson AZ 9636 QWEST CORPORATION 668      
520-320 A Tucson AZ 9636 QWEST CORPORATION 668      
520-321 A Tucson AZ 9636 QWEST CORPORATION 668      
520-322 A Tucson AZ 9636 QWEST CORPORATION 668      
520-323 A Tucson AZ 9636 QWEST CORPORATION 668      
520-324 A Tucson AZ 9636 QWEST CORPORATION 668      
520-325 A Tucson AZ 9636 QWEST CORPORATION 668   2024-01-27   
520-326 A Tucson AZ 9636 QWEST CORPORATION 668      
520-327 A Tucson AZ 9636 QWEST CORPORATION 668      
520-784 A Tucson AZ 9636 QWEST CORPORATION 668      
520-795 A Tucson AZ 9636 QWEST CORPORATION 668      
520-874 A Tucson AZ 9636 QWEST CORPORATION 668      
520-881 A Tucson AZ 9636 QWEST CORPORATION 668      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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