Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 406 [Rate centres in NPA 406] [Dial plan for NPA 406]

NXX: 519

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-519 A Missoula MT GRFLMTMANMD  515J IP HORIZON LLC 648      
406-519 0 Missoula MT   453F ONVOY, LLC - MT 648   2021-07-05   
406-519 1 Missoula MT   453F ONVOY, LLC - MT 648   2021-07-05   
406-519 2 Missoula MT   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2021-06-27   
406-519 3 Missoula MT   453F ONVOY, LLC - MT 648   2021-07-05   
406-519 4 Missoula MT   453F ONVOY, LLC - MT 648   2021-03-26   
406-519 5 Missoula MT   453F ONVOY, LLC - MT 648   2021-03-26   
406-519 6 Missoula MT   939H COMMIO, LLC 648   2023-09-22   
406-519 7 Missoula MT   515J IP HORIZON LLC 648   2021-10-22   
406-519 8 Missoula MT   6529 T-MOBILE USA, INC. 648   2022-05-20   
406-519 9 Missoula MT   6529 T-MOBILE USA, INC. 648   2022-05-20   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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