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NPA: 406 [Rate centres in NPA 406] [Dial plan for NPA 406]

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-439 9 Helena MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-440 A Helena MT HLNAMTHODS1  3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-440 0 Helena MT HLNAMTHODS1  3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-440 1 Helena MT HLNAMTHODS1  3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-440 2 Helena MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648   2025-09-14   
406-440 3 Helena MT HLNAMTHODS1  3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-440 4 Helena MT HLNAMTHODS1  3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-440 5 Helena MT HLNAMTMAWMD  6529 T-MOBILE USA, INC. 648   2024-02-22   
406-440 6 Helena MT HLNAMTMAWMD  6529 T-MOBILE USA, INC. 648   2024-02-22   
406-440 7 Helena MT   520K TDS METROCOM, LLC 648   2025-11-17   
406-440 8 Helena MT HLNAMTHODS1  3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-440 9 Helena MT HLNAMTHODS1  3924 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 648      
406-441 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-442 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-443 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-444 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-445 A Red Lodge MT RBRTMTMARS1  9636 QWEST CORPORATION 650      
406-445 0 Red Lodge MT BLNGMTWE6MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2004-11-13   
406-445 1 Red Lodge MT BLNGMTWE6MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2007-04-19   
406-445 2 Red Lodge MT RBRTMTMARS1  9636 QWEST CORPORATION 650      
406-445 3 Red Lodge MT BLNGMT93HMD  792K CHARTER IP ENABLED SERVICES, LLC 650   2011-03-27   
406-445 4 Red Lodge MT BLNGMTMATMD  935G TRI TEL, INC. - MT 650   2013-01-28   
406-445 5 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2021-07-05   
406-445 6 Red Lodge MT BLNGMT933MD  073H TELNYX LLC 650   2017-03-31   
406-445 7 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2007-03-19   
406-445 8 Red Lodge MT BLNGMTWEBMD  771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 650   2023-04-08   
406-445 9 Red Lodge MT RBRTMTMARS1  9636 QWEST CORPORATION 650      
406-446 A Red Lodge MT RDLGMTMARS1  9636 QWEST CORPORATION 650      
406-446 0 Red Lodge MT RDLGMTMARS1  9636 QWEST CORPORATION 650      
406-446 1 Red Lodge MT RDLGMTMARS1  9636 QWEST CORPORATION 650      
406-446 2 Red Lodge MT RDLGMTMARS1  9636 QWEST CORPORATION 650      
406-446 3 Red Lodge MT RDLGMTMARS1  9636 QWEST CORPORATION 650      
406-446 4 Red Lodge MT RDLGMTMARS1  9636 QWEST CORPORATION 650      
406-446 5 Red Lodge MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2026-02-06   
406-446 6 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2019-09-15   
406-446 7 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2011-10-24   
406-446 8 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2019-10-28   
406-446 9 Red Lodge MT RDLGMTMARS1  9636 QWEST CORPORATION 650      
406-447 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 1 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 2 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 3 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 4 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 5 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 6 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 7 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 8 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-447 9 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-448 A North Poplar MT NPPLMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-448 2 North Poplar MT NPPLMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-448 7 North Poplar MT GLSGMTXC1MD  443B SAGEBRUSH CELLULAR, INC. 650      
406-448 8 North Poplar MT   145J TERRA NOVA TELECOM INC. 650   2025-08-29   
406-449 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-450 A Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 0 Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 1 Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 2 Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 3 Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 4 Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 5 Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 6 Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-450 8 Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-451 A Bozeman MT BLNGMTMAXMD  6529 T-MOBILE USA, INC. 650      
406-451 0 Bozeman MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2017-11-17   
406-451 1 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2007-12-18   
406-451 2 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2007-12-28   
406-451 3 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2008-02-19   
406-451 4 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2008-03-04   
406-451 5 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2008-09-08   
406-451 6 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2008-10-08   
406-451 7 Bozeman MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2012-04-20   
406-451 8 Bozeman MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2004-09-27   
406-451 9 Bozeman MT BLNGMTMAXMD  6529 T-MOBILE USA, INC. 650   2004-09-27   
406-452 A Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-453 A Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-454 A Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 A Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 0 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 1 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 2 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 3 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 4 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 5 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 6 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 8 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-455 9 Great Falls MT GRFLMTMADS0  9636 QWEST CORPORATION 648      
406-456 A South Chester MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-457 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 0 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 1 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 2 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 3 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 4 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 5 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 7 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 8 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-457 9 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-458 A Helena MT HLNAMTNORS1  9636 QWEST CORPORATION 648      
406-458 0 Helena MT HLNAMTNORS1  9636 QWEST CORPORATION 648      
406-458 1 Helena MT HLNAMTNORS1  9636 QWEST CORPORATION 648      

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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