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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
406-924 8 Belgrade MT BZMNMTHZDS0  746D MONTANA OPTICOM, LLC - MT 650   2010-08-16   
406-924 9 Belgrade MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2009-02-13   
406-925 A Dillon MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-925 0 Dillon MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-925 1 Dillon MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-925 2 Dillon MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-925 3 Dillon MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-925 5 Dillon MT HLNAMTHH5MD  792K CHARTER IP ENABLED SERVICES, LLC 648   2008-11-21   
406-925 6 Dillon MT MSSLMTMAYMD  771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2019-05-10   
406-925 7 Dillon MT HLNAMTMAUMD  508J CENTURYLINK COMMUNICATIONS, LLC 648   2014-06-02   
406-925 9 Dillon MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-926 A Missoula MT MSSLMTEH4MD  792K CHARTER IP ENABLED SERVICES, LLC 648      
406-926 0 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2020-10-05   
406-926 1 Missoula MT MSSLMTEH4MD  792K CHARTER IP ENABLED SERVICES, LLC 648   2011-03-06   
406-926 2 Missoula MT MSSLMTEH4MD  792K CHARTER IP ENABLED SERVICES, LLC 648   2011-08-21   
406-926 3 Missoula MT MSSLMTEH4MD  792K CHARTER IP ENABLED SERVICES, LLC 648   2011-12-03   
406-926 4 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2019-09-15   
406-926 5 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2020-10-05   
406-926 6 Missoula MT MSSLMTEH4MD  792K CHARTER IP ENABLED SERVICES, LLC 648   2013-11-11   
406-926 7 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2020-10-05   
406-926 8 Missoula MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648   2020-04-25   
406-926 9 Missoula MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648   2016-01-22   
406-927 A Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-927 0 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2010-09-19   
406-927 1 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2010-09-19   
406-927 2 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2010-09-21   
406-927 3 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2015-09-07   
406-927 4 Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2013-12-09   
406-927 5 Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2014-03-10   
406-927 6 Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2014-03-31   
406-927 7 Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2014-04-15   
406-927 8 Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2014-05-08   
406-927 9 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650   2015-09-07   
406-928 A Grass Range MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-928 0 Grass Range MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-928 8 Grass Range MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-928 9 Grass Range MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-929 A Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-929 0 Hungry Horse MT   6529 T-MOBILE USA, INC. 648   2026-04-27   
406-929 1 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-15   
406-929 2 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-15   
406-929 3 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-15   
406-929 4 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-04-21   
406-929 5 Hungry Horse MT MSSLMTMACMD  6529 T-MOBILE USA, INC. 648   2024-06-22   
406-929 6 Hungry Horse MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648   2023-09-18   
406-929 7 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2007-09-21   
406-929 8 Hungry Horse MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2011-04-06   
406-929 9 Hungry Horse MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648   2023-09-18   
406-930 A Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-930 0 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-930 1 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-930 2 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-930 3 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2023-12-29   
406-930 4 Big Timber MT   145J TERRA NOVA TELECOM INC. 650   2026-01-04   
406-930 6 Big Timber MT   145J TERRA NOVA TELECOM INC. 650   2025-06-07   
406-930 9 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2024-06-14   
406-931 A Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-931 0 Big Timber MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-931 1 Big Timber MT BLNGMTWE6MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2019-01-11   
406-931 9 Big Timber MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2025-11-13   
406-932 A Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 0 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 2 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 3 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 4 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 5 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 6 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-932 7 Big Timber MT BLNGMT93HMD  792K CHARTER IP ENABLED SERVICES, LLC 650   2017-05-20   
406-932 8 Big Timber MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-933 A Helena MT CLNCMTMARS1  9636 QWEST CORPORATION 648      
406-933 3 Helena MT   145J TERRA NOVA TELECOM INC. 648   2025-10-06   
406-933 4 Helena MT   145J TERRA NOVA TELECOM INC. 648   2026-06-05   
406-933 5 Helena MT CLNCMTMARS1  9636 QWEST CORPORATION 648      
406-933 8 Helena MT CLNCMTMARS1  9636 QWEST CORPORATION 648      
406-933 9 Helena MT CLNCMTMARS1  9636 QWEST CORPORATION 648      
406-934 A Miles City MT   743G WIDE VOICE, LLC - MT 650      
406-934 0 Miles City MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-934 1 Miles City MT   743G WIDE VOICE, LLC - MT 650   2025-07-22   
406-934 8 Miles City MT BLNGMTWEDMD  624H ONVOY SPECTRUM, LLC 650   2025-01-16   
406-934 9 Miles City MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-935 A Broadus MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-935 0 Broadus MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-935 2 Broadus MT   145J TERRA NOVA TELECOM INC. 650   2025-06-07   
406-935 3 Broadus MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2018-12-17   
406-935 5 Broadus MT   145J TERRA NOVA TELECOM INC. 650   2026-01-04   
406-935 9 Broadus MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-936 A Clyde Park MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650      
406-936 0 Clyde Park MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2015-09-14   
406-936 1 Clyde Park MT BLNGMT933MD  073H TELNYX LLC 650   2018-07-25   
406-936 2 Clyde Park MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2021-03-07   
406-936 3 Clyde Park MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2019-09-15   
406-936 4 Clyde Park MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2019-10-28   
406-936 5 Clyde Park MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2021-03-07   
406-936 6 Clyde Park MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2020-01-05   
406-936 7 Clyde Park MT BLNGMTMAXMD  6529 T-MOBILE USA, INC. 650   2024-03-15   
406-936 8 Clyde Park MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2021-07-05   
406-936 9 Clyde Park MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2022-02-12   
406-937 A Sunburst MT SNBRMTXCDS0  2248 NORTHERN TEL. COOP., INC. 648      
406-938 A Alzada MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-938 0 Alzada MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      

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

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