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-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
406-972 A West Camp Crook MT CMCRSDXARL0  640      
605-244 A Bison SD BISNSDXADS0  640      
605-257 A Nisland SD NSLDSDXARS1  640      
605-374 A Lemmon SD LMMNSDXARS1  640      
605-375 A Buffalo SD BFLOSDXARL0  640      
605-456 A Newell SD NWLLSDXARS1  640      
605-788 A Meadow SD MEDWSDXARL0  640      
605-797 A Camp Crook SD CMCRSDXARL0  640      
605-866 A Sorum SD SORMSDXARL0  640      
701-376 A North Lemmon ND LMMNSDXARS1  640      

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

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