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: 605 [Rate centres in NPA 605] [Dial plan for NPA 605]

NXX: 790

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
605-790 A Sioux Falls SD SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2026-06-07   
605-790 0 Sioux Falls SD SXFLSDCHIMD  106F BANDWIDTH.COM CLEC, LLC - SD 640   2026-06-27   
605-790 1 Sioux Falls SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2026-06-27   
605-790 2 Sioux Falls SD   6569 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 640   2026-08-04   
605-790 8 Sioux Falls SD   106F BANDWIDTH.COM CLEC, LLC - SD 640   2026-08-08   
605-790 9 Sioux Falls SD SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2026-06-07   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.