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: 663

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
605-663 A Huron SD SXFLSDPSDS1  580H AIRUS, INC. - SD 640      
605-663 1 Huron SD SXFLSDPSDS1  580H AIRUS, INC. - SD 640   2021-05-22   
605-663 2 Huron SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2021-06-27   
605-663 3 Huron SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2021-06-27   
605-663 4 Huron SD SXFLSDCHIMD  106F BANDWIDTH.COM CLEC, LLC - SD 640   2021-12-10   
605-663 5 Huron SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2022-08-25   
605-663 7 Huron SD SXFLSDPSCMD  516J TON80 COMMUNICATIONS, LLC 640   2022-03-30   
605-663 8 Huron SD SXFLSDCORMD  5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640   2023-01-07   
605-663 9 Huron SD SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2022-09-08   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.