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: TCSNAZMAVMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
520-223 A Nogales AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-226 A Sierra Vista AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-246 A Tucson AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-254 A Willcox AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-314 A Tucson AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-337 A Willcox AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-369 A Tucson AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-433 A Tucson AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-542 A Tucson AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-589 A Tucson AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-640 A Tucson AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-681 A Nogales AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
520-829 A Tucson AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
575-424 A Virden NM 5470 LEVEL 3 COMMUNICATIONS, LLC - NM 668      
928-439 A Duncan AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
928-792 A Safford AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      
928-793 A Globe AZ 3285 LEVEL 3 COMMUNICATIONS, LLC - AZ 668      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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