Local Calling Guide
Area code/prefix search
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 98 99 >>
| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 406-323
| 1 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 2 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 3 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 4 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 7 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 8 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-323
| 9 |
Roundup |
MT |
RNDPMTXCDS0 |
2246 MID-RIVERS TEL. COOP., INC. |
650 |
|
|
|
| 406-324
| A |
Helena |
MT |
HLNAMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-324
| 0 |
Helena |
MT |
HLNAMTMAX1X |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
648 |
|
2024-06-22 |
|
| 406-324
| 1 |
Helena |
MT |
HLNAMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-324
| 2 |
Helena |
MT |
HLNAMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-324
| 3 |
Helena |
MT |
HLNAMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-324
| 4 |
Helena |
MT |
HLNAMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-324
| 5 |
Helena |
MT |
HLNAMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-324
| 6 |
Helena |
MT |
HLNAMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-324
| 7 |
Helena |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2006-05-27 |
|
| 406-324
| 8 |
Helena |
MT |
HLNAMTMAX1X |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
648 |
|
2025-02-12 |
|
| 406-324
| 9 |
Helena |
MT |
GRFLMTMAHMD |
073H TELNYX LLC |
648 |
|
2020-08-13 |
|
| 406-325
| A |
Billings |
MT |
BLNGMTMAX6X |
732J NUSO, LLC |
650 |
|
|
|
| 406-325
| 0 |
Billings |
MT |
BLNGMT934MD |
939H COMMIO, LLC |
650 |
|
2024-03-03 |
|
| 406-325
| 1 |
Billings |
MT |
BLNGMTMAX6X |
732J NUSO, LLC |
650 |
|
2022-09-29 |
|
| 406-325
| 2 |
Billings |
MT |
BLNGMT934MD |
939H COMMIO, LLC |
650 |
|
2024-03-03 |
|
| 406-325
| 3 |
Billings |
MT |
BLNGMT934MD |
939H COMMIO, LLC |
650 |
|
2024-03-03 |
|
| 406-325
| 4 |
Billings |
MT |
BLNGMT20PS0 |
4222 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM |
650 |
|
|
|
| 406-325
| 5 |
Billings |
MT |
BLNGMTMAXMD |
6529 T-MOBILE USA, INC. |
650 |
|
2025-08-07 |
|
| 406-325
| 6 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2015-12-10 |
|
| 406-325
| 7 |
Billings |
MT |
BLNGMTMALMD |
994E BANDWIDTH.COM CLEC, LLC - MT |
650 |
|
2016-07-16 |
|
| 406-325
| 8 |
Billings |
MT |
BLNGMT20PS0 |
4222 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM |
650 |
|
|
|
| 406-325
| 9 |
Billings |
MT |
BLNGMT934MD |
939H COMMIO, LLC |
650 |
|
2024-03-03 |
|
| 406-326
| A |
Reedpoint |
MT |
BGTMMTXCDS0 |
2257 TRIANGLE TEL. COOP. ASSN., INC. |
650 |
|
|
|
| 406-327
| A |
Missoula |
MT |
MSSLMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-328
| A |
Absarokee |
MT |
ABSRMTXCDS0 |
2250 PROJECT TEL. CO., INC. |
650 |
|
|
|
| 406-328
| 3 |
Absarokee |
MT |
BLNGMTWE6MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
650 |
|
2023-03-29 |
|
| 406-328
| 4 |
Absarokee |
MT |
ABSRMTXCDS0 |
2250 PROJECT TEL. CO., INC. |
650 |
|
|
|
| 406-328
| 6 |
Absarokee |
MT |
ABSRMTXCDS0 |
2250 PROJECT TEL. CO., INC. |
650 |
|
|
|
| 406-328
| 7 |
Absarokee |
MT |
ABSRMTXCDS0 |
2250 PROJECT TEL. CO., INC. |
650 |
|
|
|
| 406-328
| 8 |
Absarokee |
MT |
ABSRMTXCDS0 |
2250 PROJECT TEL. CO., INC. |
650 |
|
|
|
| 406-328
| 9 |
Absarokee |
MT |
ABSRMTXCDS0 |
2250 PROJECT TEL. CO., INC. |
650 |
|
|
|
| 406-329
| A |
Missoula |
MT |
MSSLMTMADS0 |
9636 QWEST CORPORATION |
648 |
|
|
|
| 406-330
| A |
Clinton |
MT |
MSSLMTEH4MD |
792K CHARTER IP ENABLED SERVICES, LLC |
648 |
|
|
|
| 406-330
| 0 |
Clinton |
MT |
MSSLMTMACMD |
6529 T-MOBILE USA, INC. |
648 |
|
2024-09-23 |
|
| 406-330
| 1 |
Clinton |
MT |
MSSLMTMACMD |
6529 T-MOBILE USA, INC. |
648 |
|
2026-04-15 |
|
| 406-330
| 2 |
Clinton |
MT |
MSSLMTEH4MD |
792K CHARTER IP ENABLED SERVICES, LLC |
648 |
|
2006-06-03 |
|
| 406-330
| 3 |
Clinton |
MT |
|
145J TERRA NOVA TELECOM INC. |
648 |
|
2025-10-06 |
|
| 406-331
| A |
Roundup |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
|
|
| 406-331
| 0 |
Roundup |
MT |
BLNGMTWEIMD |
6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT |
650 |
|
|
|
| 406-331
| 1 |
Roundup |
MT |
|
145J TERRA NOVA TELECOM INC. |
650 |
|
2025-08-29 |
|
| 406-332
| A |
Pablo |
MT |
MSSLMTXCDS0 |
2235 BLACKFOOT TEL. COOP., INC. |
648 |
|
|
|
| 406-332
| 1 |
Pablo |
MT |
MSSLMTEH4MD |
792K CHARTER IP ENABLED SERVICES, LLC |
648 |
|
2024-03-31 |
|
| 406-332
| 2 |
Pablo |
MT |
|
145J TERRA NOVA TELECOM INC. |
648 |
|
2025-10-09 |
|
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Last updated: Sat, 10 Oct 2026 15:24:20 UTC
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