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

NXX: 370

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-370 A Delano CA BKFDCA119MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 734      
661-370 0 Delano CA BKFDCA119MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 734      
661-370 1 Delano CA BKFDCA018MD  6010 NEW CINGULAR WIRELESS PCS, LLC 734   2004-08-04   
661-370 2 Delano CA BKFDCA11GMD  649C ONVOY, LLC - CA 734   2006-01-14   
661-370 3 Delano CA BKFDCA119MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 734   2012-06-02   
661-370 4 Delano CA BKFDCAJADS0  7128 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 734   2005-04-28   
661-370 5 Delano CA BKFDCA018MD  6010 NEW CINGULAR WIRELESS PCS, LLC 734   2006-09-15   
661-370 6 Delano CA BKFDCA018MD  6010 NEW CINGULAR WIRELESS PCS, LLC 734   2006-09-15   
661-370 7 Delano CA BKFDCA018MD  6010 NEW CINGULAR WIRELESS PCS, LLC 734   2007-04-15   
661-370 8 Delano CA BKFDCA018MD  6010 NEW CINGULAR WIRELESS PCS, LLC 734   2007-04-15   
661-370 9 Delano CA BKFDCA01X2X  5562 METROPCS, INC. 734   2017-10-14   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.