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: 661 [Rate centres in NPA 661] [Dial plan for NPA 661]

NXX: 681

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-681 A Bakersfield: North DA CA   478J NUSO, LLC 734   2025-06-12   
661-681 0 Bakersfield: North DA CA   649C ONVOY, LLC - CA 734   2026-07-24   
661-681 1 Bakersfield: North DA CA   478J NUSO, LLC 734   2025-06-12   
661-681 6 Bakersfield: North DA CA   321J HD CARRIER LLC 734   2026-05-15   
661-681 7 Bakersfield: North DA CA   321J HD CARRIER LLC 734   2026-05-15   
661-681 8 Bakersfield: North DA CA   321J HD CARRIER LLC 734   2026-05-15   
661-681 9 Bakersfield: North DA CA   649C ONVOY, LLC - CA 734   2026-07-24   

Last updated: Sat, 04 Jul 2026 13:07:56 UTC

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