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: MSSLMTMADS0

Remotes:

Switch Switch name Switch type
FCTWMTMARS1  FRENCHTOWN  5ER 
LOLOMTMARS1  LOLO  5ER 
MLTWMTMARS1  MILLTOWN  5ER 
MSSLMTSORS1  MISSOULA SOUTH  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-243 A Missoula MT 9636 QWEST CORPORATION 648      
406-327 A Missoula MT 9636 QWEST CORPORATION 648      
406-329 A Missoula MT 9636 QWEST CORPORATION 648      
406-523 A Missoula MT 9636 QWEST CORPORATION 648      
406-542 A Missoula MT 9636 QWEST CORPORATION 648      
406-543 A Missoula MT 9636 QWEST CORPORATION 648      
406-549 A Missoula MT 9636 QWEST CORPORATION 648      
406-721 A Missoula MT 9636 QWEST CORPORATION 648      
406-728 A Missoula MT 9636 QWEST CORPORATION 648      
406-829 A Missoula MT 9636 QWEST CORPORATION 648      

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

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