Montana Area Codes
Data last updated: June 25, 2026
Area Codes in Montana
| NPA | Major Cities | Status | Exchanges | Overlay |
|---|---|---|---|---|
| 406 | Billings, Missoula, Helena | Active | 786 | No |
Top Carriers in Montana
| Carrier | OCN | NXX Count |
|---|---|---|
| QWEST CORPORATION | 9636 | 132 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | 119 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 74 |
| ONVOY, LLC - MT | 453F | 43 |
| NEMONT TEL COOP INC | 2247 | 33 |
| MID-RIVERS TEL. COOP., INC. | 2246 | 27 |
| LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | 27 |
| 3 RIVERS TEL. COOP., INC. | 2255 | 26 |
| TRIANGLE TEL. COOP. ASSN., INC. | 2257 | 26 |
| CHARTER IP ENABLED SERVICES, LLC | 792K | 26 |