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: TCSNAZMAXYX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
520-348 A Willcox AZ 508J CENTURYLINK COMMUNICATIONS, LLC 668      
520-595 A Benson AZ 508J CENTURYLINK COMMUNICATIONS, LLC 668      
520-639 A Tucson AZ 508J CENTURYLINK COMMUNICATIONS, LLC 668      
928-316 A Pima AZ 508J CENTURYLINK COMMUNICATIONS, LLC 668      

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

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