Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

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

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-451 8 Bozeman MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2004-09-27   
406-451 9 Bozeman MT   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   247L YORKSTREAM COMMUNICATIONS LLC 648      
406-455 0 Great Falls MT   9636 QWEST CORPORATION 648      
406-455 1 Great Falls MT   9636 QWEST CORPORATION 648      
406-455 2 Great Falls MT   9636 QWEST CORPORATION 648      
406-455 3 Great Falls MT   9636 QWEST CORPORATION 648      
406-455 4 Great Falls MT   9636 QWEST CORPORATION 648      
406-455 5 Great Falls MT   9636 QWEST CORPORATION 648      
406-455 6 Great Falls MT   9636 QWEST CORPORATION 648      
406-455 7 Great Falls MT   247L YORKSTREAM COMMUNICATIONS LLC 648   2025-10-06   
406-455 8 Great Falls MT   9636 QWEST CORPORATION 648      
406-455 9 Great Falls MT   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   9636 QWEST CORPORATION 648      
406-457 1 Helena MT   9636 QWEST CORPORATION 648      
406-457 2 Helena MT   9636 QWEST CORPORATION 648      
406-457 3 Helena MT   9636 QWEST CORPORATION 648      
406-457 4 Helena MT   9636 QWEST CORPORATION 648      
406-457 5 Helena MT   9636 QWEST CORPORATION 648      
406-457 7 Helena MT   9636 QWEST CORPORATION 648      
406-457 8 Helena MT   9636 QWEST CORPORATION 648      
406-457 9 Helena MT   9636 QWEST CORPORATION 648      
406-458 A Helena MT HLNAMTNORS1  9636 QWEST CORPORATION 648      
406-458 0 Helena MT   9636 QWEST CORPORATION 648      
406-458 1 Helena MT   9636 QWEST CORPORATION 648      
406-458 3 Helena MT   9636 QWEST CORPORATION 648      
406-458 4 Helena MT   9636 QWEST CORPORATION 648      
406-458 5 Helena MT   9636 QWEST CORPORATION 648      
406-458 6 Helena MT   9636 QWEST CORPORATION 648      
406-458 7 Helena MT   9636 QWEST CORPORATION 648      
406-458 8 Helena MT   9636 QWEST CORPORATION 648      
406-458 9 Helena MT   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      
406-460 0 Shelby MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-460 1 Shelby MT   6010 NEW CINGULAR WIRELESS PCS, LLC 648      
406-460 2 Shelby MT   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      
406-464 2 Roy MT   2246 MID-RIVERS TEL. COOP., INC. 650      
406-464 4 Roy MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2018-12-17   
406-464 6 Roy MT   145J TERRA NOVA TELECOM INC. 650   2025-08-29   
406-465 A Helena MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 >>

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.