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

Block: A

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
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      
406-456 A South Chester MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-457 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-458 A Helena MT HLNAMTNORS1  9636 QWEST CORPORATION 648      
406-459 A Helena MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-460 A Shelby MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-461 A Helena MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-462 A Winifred MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-463 A Power MT FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-464 A Roy MT RNDPMTXCDS0  2246 MID-RIVERS TEL. COOP., INC. 650      
406-465 A Helena MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-466 A Choteau MT FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-467 A Fairfield MT FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-468 A Cascade MT CSCDMTMARS1  9636 QWEST CORPORATION 648      
406-469 A Pendroy MT FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-470 A Shelby MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-471 A Kalispell MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-472 A Dupuyer MT FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-473 A Judith Gap MT FTBNMTXCDS0  3310 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-474 A Flaxville MT FLVLMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-475 A Helena MT CNFYMT02RS1  9636 QWEST CORPORATION 648      
406-476 A Dutton MT DTTNMTMARS1  9636 QWEST CORPORATION 648      
406-477 A Lame Deer MT LMDRMTXCRS1  2251 RANGE TEL COOP INC 650      
406-478 A Sidney MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-479 A Butte MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-480 A Sidney MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-481 A Missoula MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-482 A Sidney MT SDNYMTMARS1  9636 QWEST CORPORATION 650      
406-483 A Dagmar MT DGMRMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-484 A Crooked Creek MT BASNWYXCDS1  2296 TRI-COUNTY TEL. ASSN., INC. 654      
406-485 A Circle MT WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-486 A Fallon MT WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-487 A Scobey MT SCBYMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-488 A Sidney MT SDNYMTAORS0  7830 MID-RIVERS TELEPHONE COOPERATIVE, INC. 650      
406-489 A Sidney MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-490 A Butte MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-491 A Butte MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-492 A Avon MT AVONMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-493 A Missoula MT MSSLMTEH4MD  792K CHARTER IP ENABLED SERVICES, LLC 648      
406-494 A Butte MT BUTTMT18RS1  9636 QWEST CORPORATION 648      
406-495 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-496 A Butte MT BUTTMT09DS0  9636 QWEST CORPORATION 648      
406-497 A Butte MT BUTTMT09DS0  9636 QWEST CORPORATION 648      
406-498 A Butte MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-499 A Seeley Lake MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-500 A Billings MT BLNGMT938MD  965H FRACTEL, LLC 650      
406-501 A Whitehall MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-502 A Helena MT HLNAMTHH5MD  792K CHARTER IP ENABLED SERVICES, LLC 648      

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Last updated: Tue, 29 Sep 2026 03:00:13 UTC

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