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.

Letcher, SD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
605-248 A WNSCSDXADS0  1676 SANTEL COMMUNICATIONS COOPERATIVE, INC. - SD 640      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.