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: HLNAMTMADS0

Remotes:

Switch Switch name Switch type
EHLNMTMARS1  EAST HELENA  5ER 
HLNAMTNORS1  HELENA NORTH  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-324 A Helena MT 9636 QWEST CORPORATION 648      
406-324 1 Helena MT 9636 QWEST CORPORATION 648      
406-324 2 Helena MT 9636 QWEST CORPORATION 648      
406-324 3 Helena MT 9636 QWEST CORPORATION 648      
406-324 4 Helena MT 9636 QWEST CORPORATION 648      
406-324 5 Helena MT 9636 QWEST CORPORATION 648      
406-324 6 Helena MT 9636 QWEST CORPORATION 648      
406-437 5 Helena MT 9636 QWEST CORPORATION 648   2008-08-13   
406-437 6 Helena MT 9636 QWEST CORPORATION 648   2008-08-13   
406-437 7 Helena MT 9636 QWEST CORPORATION 648   2008-08-13   
406-441 A Helena MT 9636 QWEST CORPORATION 648      
406-442 A Helena MT 9636 QWEST CORPORATION 648      
406-443 A Helena MT 9636 QWEST CORPORATION 648      
406-444 A Helena MT 9636 QWEST CORPORATION 648      
406-447 A Helena MT 9636 QWEST CORPORATION 648      
406-447 1 Helena MT 9636 QWEST CORPORATION 648      
406-447 2 Helena MT 9636 QWEST CORPORATION 648      
406-447 3 Helena MT 9636 QWEST CORPORATION 648      
406-447 4 Helena MT 9636 QWEST CORPORATION 648      
406-447 5 Helena MT 9636 QWEST CORPORATION 648      
406-447 6 Helena MT 9636 QWEST CORPORATION 648      
406-447 7 Helena MT 9636 QWEST CORPORATION 648      
406-447 8 Helena MT 9636 QWEST CORPORATION 648      
406-447 9 Helena MT 9636 QWEST CORPORATION 648      
406-449 A Helena MT 9636 QWEST CORPORATION 648      
406-457 A Helena MT 9636 QWEST CORPORATION 648      
406-457 0 Helena MT 9636 QWEST CORPORATION 648      
406-457 1 Helena MT 9636 QWEST CORPORATION 648      
406-457 2 Helena MT 9636 QWEST CORPORATION 648      
406-457 3 Helena MT 9636 QWEST CORPORATION 648      
406-457 4 Helena MT 9636 QWEST CORPORATION 648      
406-457 5 Helena MT 9636 QWEST CORPORATION 648      
406-457 7 Helena MT 9636 QWEST CORPORATION 648      
406-457 8 Helena MT 9636 QWEST CORPORATION 648      
406-457 9 Helena MT 9636 QWEST CORPORATION 648      
406-495 A Helena MT 9636 QWEST CORPORATION 648      
406-495 0 Helena MT 9636 QWEST CORPORATION 648      
406-495 1 Helena MT 9636 QWEST CORPORATION 648      
406-495 2 Helena MT 9636 QWEST CORPORATION 648      
406-495 3 Helena MT 9636 QWEST CORPORATION 648      
406-495 5 Helena MT 9636 QWEST CORPORATION 648      
406-495 6 Helena MT 9636 QWEST CORPORATION 648      
406-495 7 Helena MT 9636 QWEST CORPORATION 648      
406-495 8 Helena MT 9636 QWEST CORPORATION 648      
406-495 9 Helena MT 9636 QWEST CORPORATION 648      
406-841 A Helena MT 9636 QWEST CORPORATION 648      
406-841 0 Helena MT 9636 QWEST CORPORATION 648      
406-841 1 Helena MT 9636 QWEST CORPORATION 648      
406-841 2 Helena MT 9636 QWEST CORPORATION 648      
406-841 3 Helena MT 9636 QWEST CORPORATION 648      
406-841 4 Helena MT 9636 QWEST CORPORATION 648      
406-841 5 Helena MT 9636 QWEST CORPORATION 648      
406-841 7 Helena MT 9636 QWEST CORPORATION 648      
406-841 8 Helena MT 9636 QWEST CORPORATION 648      
406-841 9 Helena MT 9636 QWEST CORPORATION 648      

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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