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: 685

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-685 A Arvin CA   6529 T-MOBILE USA, INC. 734   2026-01-30   
661-685 3 Arvin CA   6529 T-MOBILE USA, INC. 734   2026-02-05   
661-685 4 Arvin CA   6529 T-MOBILE USA, INC. 734   2026-02-05   
661-685 5 Arvin CA   6529 T-MOBILE USA, INC. 734   2026-02-05   
661-685 6 Arvin CA   6529 T-MOBILE USA, INC. 734   2026-02-05   
661-685 7 Arvin CA   6529 T-MOBILE USA, INC. 734   2026-02-05   
661-685 8 Arvin CA   6529 T-MOBILE USA, INC. 734   2026-01-30   
661-685 9 Arvin CA   6529 T-MOBILE USA, INC. 734   2026-01-30   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.