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.

Lennox, SD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
605-647 A LNNXSDXARS1  1652 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-744 A SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-744 0   7076 MIDCONTINENT COMMUNICATIONS. - SD 640   2012-08-25   
605-744 1   490J DISH WIRELESS, LLC 640   2022-08-28   
605-744 4   145J TERRA NOVA TELECOM INC. 640   2025-08-01   
605-744 6   516J TON80 COMMUNICATIONS, LLC 640   2022-03-28   
605-744 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2011-04-29   
605-750 A SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-750 0   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.