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.

Casa Grande, AZ

<< 1 2 3 4 5 6 7

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
520-866 8 FLRNAZMARS1  9636 QWEST CORPORATION 666   2007-06-11   
520-866 9 MRCPAZMADS0  9636 QWEST CORPORATION 666   2007-07-16   
520-868 A FLRNAZMARS1  9636 QWEST CORPORATION 666      
520-876 A CSGRAZMADS0  9636 QWEST CORPORATION 666      

<< 1 2 3 4 5 6 7

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.