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: 530 [Rate centres in NPA 530] [Dial plan for NPA 530]

NXX: 640

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
530-640 A Alturas CA RDNGCAGA0MD  6261 UNITED STATES CELLULAR - CA 724      
530-640 0 Alturas CA RDNGCAGA0MD  6261 UNITED STATES CELLULAR - CA 724      
530-640 1 Alturas CA RDNGCAGA0MD  6261 UNITED STATES CELLULAR - CA 724      
530-640 2 Alturas CA RDNGCAGA0MD  6261 UNITED STATES CELLULAR - CA 724      
530-640 3 Alturas CA RDNGCAGA0MD  6261 UNITED STATES CELLULAR - CA 724      
530-640 5 Alturas CA   776C CHARTER FIBERLINK CA-CCO, LLC - CA 724   2025-04-27   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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