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: 424

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-424 A Casa Grande AZ STFDAZMARS1  9636 QWEST CORPORATION 666      
520-424 0 Casa Grande AZ STFDAZMARS1  9636 QWEST CORPORATION 666      
520-424 1 Casa Grande AZ PHNZAZZJAMD  6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 666   2014-11-25   
520-424 2 Casa Grande AZ CLDGAZMARS1  9636 QWEST CORPORATION 666   2007-04-09   
520-424 3 Casa Grande AZ STFDAZMARS1  9636 QWEST CORPORATION 666      
520-424 4 Casa Grande AZ PHNXAZMACM6  6010 NEW CINGULAR WIRELESS PCS, LLC 666   2009-03-25   
520-424 5 Casa Grande AZ PHNXAZMACM6  6010 NEW CINGULAR WIRELESS PCS, LLC 666   2008-05-22   
520-424 6 Casa Grande AZ PHNXAZMACM6  6010 NEW CINGULAR WIRELESS PCS, LLC 666   2008-12-13   
520-424 7 Casa Grande AZ PHNXAZ28DS3  630E ONVOY, LLC - AZ 666   2014-10-30   
520-424 8 Casa Grande AZ PHNXAZMACM6  6010 NEW CINGULAR WIRELESS PCS, LLC 666   2009-03-24   
520-424 9 Casa Grande AZ STFDAZMARS1  9636 QWEST CORPORATION 666      

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.