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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Switch: BKFHCAON6MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
661-681 A Bakersfield: North DA CA 478J NUSO, LLC 734   2025-06-12   
661-681 1 Bakersfield: North DA CA 478J NUSO, LLC 734   2025-06-12   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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