Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 520 [Rate centres in NPA 520] [Dial plan for NPA 520]

NXX: 866

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-866 A Casa Grande AZ FLRNAZMARS1  9636 QWEST CORPORATION 666      
520-866 0 Casa Grande AZ   630E ONVOY, LLC - AZ 666   2014-09-25   
520-866 1 Casa Grande AZ   6529 T-MOBILE USA, INC. 666   2016-09-22   
520-866 2 Casa Grande AZ   9636 QWEST CORPORATION 666   2007-06-11   
520-866 3 Casa Grande AZ   9636 QWEST CORPORATION 666   2007-06-11   
520-866 4 Casa Grande AZ   9636 QWEST CORPORATION 666      
520-866 5 Casa Grande AZ   9636 QWEST CORPORATION 666      
520-866 6 Casa Grande AZ   9636 QWEST CORPORATION 666      
520-866 7 Casa Grande AZ   9636 QWEST CORPORATION 666      
520-866 8 Casa Grande AZ   9636 QWEST CORPORATION 666   2007-06-11   
520-866 9 Casa Grande AZ   9636 QWEST CORPORATION 666   2007-07-16   

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

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