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.

OCN: 920F MCC TELEPHONY OF THE MID-WEST, LLC - SD

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
605-304 A White SD CLLKSDXA0MD  640      
605-304 1 White SD CLLKSDXA0MD  640   2010-09-26   
605-414 A Castlewood SD CLLKSDXA0MD  640      
605-414 1 Castlewood SD CLLKSDXA0MD  640   2010-09-26   
605-534 6 Flandreau SD SXFLSDCOWMD  640   2010-07-31   
605-560 A Brookings Rural SD BKNGSDXB0MD  640      
605-560 1 Brookings Rural SD BKNGSDXB0MD  640   2017-02-10   
605-592 3 Brookings SD BKNGSDXB0MD  640   2018-01-26   
605-592 9 Brookings SD BKNGSDXB0MD  640   2010-07-31   
605-627 3 Volga SD SXFLSDCOWMD  640   2010-07-31   
605-632 A Lake Preston SD SXFLSDCOWMD  640      
605-632 1 Lake Preston SD SXFLSDCOWMD  640   2010-08-14   
605-686 A Estelline SD BKNGSDXB0MD  640      
605-686 1 Estelline SD BKNGSDXB0MD  640   2010-09-26   
605-710 A Lake Norden SD CLLKSDXA0MD  640      
605-710 1 Lake Norden SD CLLKSDXA0MD  640   2010-09-26   
605-792 A Hayti SD CLLKSDXA0MD  640      
605-792 1 Hayti SD CLLKSDXA0MD  640   2010-09-26   
605-854 6 De Smet SD SXFLSDCOWMD  640   2010-07-31   
605-922 A Elkton SD CLLKSDXA0MD  640      
605-922 1 Elkton SD CLLKSDXA0MD  640   2010-09-26   
605-983 0 Arlington SD SXFLSDCOWMD  640   2010-07-31   
605-997 8 Flandreau SD SXFLSDCOWMD  640   2010-07-31   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.