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: 350 [Rate centres in NPA 350] [Dial plan for NPA 350]

NXX: 255

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-255 A Manteca CA MNTCCAXGBMD  649C ONVOY, LLC - CA 738   2026-02-02   
350-255 0 Manteca CA MNTCCAXGBMD  649C ONVOY, LLC - CA 738   2026-02-02   
350-255 1 Manteca CA MNTCCAXGBMD  649C ONVOY, LLC - CA 738   2026-06-14   
350-255 5 Manteca CA   114J EXIANT COMMUNICATIONS LLC 738   2026-08-10   
350-255 6 Manteca CA   649C ONVOY, LLC - CA 738   2026-08-01   
350-255 7 Manteca CA   649C ONVOY, LLC - CA 738   2026-08-01   
350-255 8 Manteca CA   649C ONVOY, LLC - CA 738   2026-08-01   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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