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: 578

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
605-578 A Spearfish SD DDWDSDCORS1  9631 QWEST CORPORATION 640      
605-578 0 Spearfish SD SXFLSDCHIMD  106F BANDWIDTH.COM CLEC, LLC - SD 640   2016-08-21   
605-578 1 Spearfish SD DDWDSDCORS1  9631 QWEST CORPORATION 640      
605-578 2 Spearfish SD DDWDSDCORS1  9631 QWEST CORPORATION 640      
605-578 3 Spearfish SD DDWDSDCORS1  9631 QWEST CORPORATION 640      
605-578 4 Spearfish SD DDWDSDCORS1  9631 QWEST CORPORATION 640      
605-578 6 Spearfish SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2009-05-28   
605-578 7 Spearfish SD DDWDSDCORS1  9631 QWEST CORPORATION 640      
605-578 9 Spearfish SD DDWDSDCORS1  9631 QWEST CORPORATION 640      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.