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.

NPA: 520 [Rate centres in NPA 520] [Dial plan for NPA 520]

NXX: 878

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-878 A Tucson AZ TCSNAZNODS0  9636 QWEST CORPORATION 668      
520-878 0 Tucson AZ   9636 QWEST CORPORATION 668      
520-878 1 Tucson AZ   9636 QWEST CORPORATION 668      
520-878 2 Tucson AZ   9636 QWEST CORPORATION 668      
520-878 3 Tucson AZ   6529 T-MOBILE USA, INC. 668   2007-04-02   
520-878 4 Tucson AZ   9636 QWEST CORPORATION 668      
520-878 5 Tucson AZ   7552 LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 668   2008-08-13   
520-878 6 Tucson AZ   6010 NEW CINGULAR WIRELESS PCS, LLC 668   2008-08-27   
520-878 7 Tucson AZ   6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 668   2012-11-20   
520-878 8 Tucson AZ   6010 NEW CINGULAR WIRELESS PCS, LLC 668   2008-08-27   
520-878 9 Tucson AZ   9636 QWEST CORPORATION 668      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.