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: 683

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-683 A Lancaster CA   649C ONVOY, LLC - CA 730   2025-10-25   
661-683 0 Lancaster CA   649C ONVOY, LLC - CA 730   2025-10-25   
661-683 1 Lancaster CA   490J DISH WIRELESS, LLC 730   2025-10-27   
661-683 2 Lancaster CA   516C AT&T CORP. 730   2026-01-06   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.