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.

Switch: KLSLMTXCDS0

Remotes:

Switch Switch name Switch type
BGFKMTXCRS0  BIGFORK  RSC 
CLFLMTXCRS0  COLUMBIA FALLS  RSC 
ELMOMTXCRS0  ELMO  RLC 
FNPTMTXCRS0  FINLEY POINT  RLC 
HNHRMTXCRS0  HUNGRY HORSE  RSC 
LKSDMTXCRS0  LAKESIDE  RSC 
MARNMTXCRS0  MARION  RSC 
OLNYMTXCRS0  OLNEY  RLC 
PLSNMTXCRS0  POLSON  RSC 
SMRSMTXCRS0  SOMERS  RSC 
SWLKMTXCRS0  SWAN LAKE  RSC 
WHFSMTXCRS0  WHITEFISH  RSC 
YLBYMTXCRS0  YELLOW BAY  RLC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-257 A Kalispell MT 2249 CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 648      
406-751 A Kalispell MT 2249 CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 648      
406-752 A Kalispell MT 2249 CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 648      
406-755 A Kalispell MT 2249 CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 648      
406-756 A Kalispell MT 2249 CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 648      
406-758 A Kalispell MT 2249 CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 648      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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