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: 371

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-371 A Casa Grande AZ TEMPAZNR5MD  5562 METROPCS, INC. 666      
520-371 0 Casa Grande AZ   6529 T-MOBILE USA, INC. 666      
520-371 1 Casa Grande AZ   5562 METROPCS, INC. 666      
520-371 2 Casa Grande AZ   5562 METROPCS, INC. 666      
520-371 3 Casa Grande AZ   5562 METROPCS, INC. 666   2006-11-09   
520-371 4 Casa Grande AZ   5562 METROPCS, INC. 666   2006-11-09   
520-371 5 Casa Grande AZ   579F PEERLESS NETWORK OF ARIZONA, LLC - AZ 666   2013-04-26   
520-371 6 Casa Grande AZ   5562 METROPCS, INC. 666   2007-03-23   
520-371 7 Casa Grande AZ   5562 METROPCS, INC. 666   2005-06-20   
520-371 8 Casa Grande AZ   6529 T-MOBILE USA, INC. 666   2009-04-17   
520-371 9 Casa Grande AZ   5562 METROPCS, INC. 666      

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.