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.
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NPA: 820 [Rate centres in NPA 820] [Dial plan for NPA 820]

NXX: 242

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
820-242 A El Rio CA   649C ONVOY, LLC - CA 730   2025-11-09   
820-242 0 El Rio CA   649C ONVOY, LLC - CA 730   2025-11-09   
820-242 1 El Rio CA   516C AT&T CORP. 730   2026-01-06   
820-242 2 El Rio CA   649C ONVOY, LLC - CA 730   2025-11-28   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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