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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
406-657 A Billings MT BLNGMTMADS1  9636 QWEST CORPORATION 650      
406-658 A South Malta MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-659 A North Parkman MT DNRHWYMARS1  9636 QWEST CORPORATION 654      
406-660 A Dillon MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-661 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-662 A Bridger MT BRDGMT01RS1  9636 QWEST CORPORATION 650      
406-663 A Rapelje MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-664 A Belfry MT BLFYMTXCDS0  2250 PROJECT TEL. CO., INC. 650      
406-665 A Hardin MT HRDNMTMARS1  9636 QWEST CORPORATION 650      
406-666 A Fort Smith MT FTSMMTXCRS1  2250 PROJECT TEL. CO., INC. 650      
406-667 A Broadview MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-668 A Fromberg MT FRMBMTMARS1  9636 QWEST CORPORATION 650      
406-669 A Molt MT BGTMMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 650      
406-670 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-671 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-672 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-673 A Hays MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-674 A Whitewater MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-675 A Pablo MT PABLMTXCRS1  2252 RONAN TEL. CO. 648      
406-676 A Ronan MT RONNMTXCDS0  2252 RONAN TEL. CO. 648      
406-677 A Seeley Lake MT CLTNMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-678 A Haugan MT HAGNMTXCRS1  2235 BLACKFOOT TEL. COOP., INC. 648      
406-679 A Hardin MT BLNGMTVR5MD  732J NUSO, LLC 650      
406-680 A Malta MT MALTMTXC1MD  443B SAGEBRUSH CELLULAR, INC. 648      
406-681 A Grant MT WSDMMTXCDS0  2254 SOUTHERN MONTANA TEL. CO. 648      
406-682 A Ennis MT FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-683 A Dillon MT DLLNMTMARS1  9636 QWEST CORPORATION 648      
406-684 A Twin Bridges MT FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-685 A Harrison MT FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-686 A Clyde Park MT CLPKMTMARS1  9636 QWEST CORPORATION 650      
406-687 A West Glendive MT WGLNMTXCDS2  2246 MID-RIVERS TEL. COOP., INC. 650      
406-688 A Scobey MT GLSGMTXC1MD  443B SAGEBRUSH CELLULAR, INC. 650      
406-689 A Wisdom MT WSDMMTXCDS0  2254 SOUTHERN MONTANA TEL. CO. 648      
406-690 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-691 A Anaconda MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-692 A Yellow Bay MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-693 A Warm Springs MT WRSPMTMARS1  9636 QWEST CORPORATION 648      
406-694 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-695 A Frazer MT FRZRMTXCRS1  2247 NEMONT TEL COOP INC 650      
406-696 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-697 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-698 A Billings MT BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-699 A Hardin MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-702 A Billings MT BLNGMT93HMD  792K CHARTER IP ENABLED SERVICES, LLC 650      
406-703 A Columbus MT BLNGMTWE0MD  073H TELNYX LLC 650      
406-707 A Lewistown MT GRFLMTMAYMD  145J TERRA NOVA TELECOM INC. 648      
406-708 A Lewistown MT GRFLMTMAXMD  743G WIDE VOICE, LLC - MT 648      
406-709 A Lakeside MT KLSLMTAZ1MD  792K CHARTER IP ENABLED SERVICES, LLC 648      
406-717 A Billings MT BLNGMT937MD  197D VONAGE AMERICA LLC 650      
406-718 A Darby MT GRFLMTMAPMD  506J TWILIO INTERNATIONAL, INC. 648      

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

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