3 RIVERS TEL. COOP., INC.
26 prefixes in 406 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 406-236 | NEIHART | 2255 | — | — |
| 406-264 | FORT SHAW | 2255 | — | — |
| 406-276 | LIMA | 2255 | — | Yes |
| 406-277 | BELT | 2255 | — | — |
| 406-279 | VALIER | 2255 | — | — |
| 406-463 | POWER | 2255 | — | — |
| 406-466 | CHOTEAU | 2255 | — | Yes |
| 406-467 | FAIRFIELD | 2255 | — | Yes |
| 406-469 | PENDROY | 2255 | — | — |
| 406-472 | DUPUYER | 2255 | — | — |
| 406-562 | AUGUSTA | 2255 | — | — |
| 406-627 | EASTCONRAD | 2255 | — | — |
| 406-682 | ENNIS | 2255 | — | Yes |
| 406-684 | TWINBRIDGS | 2255 | — | — |
| 406-685 | HARRISON | 2255 | — | — |
| 406-733 | HIGHWOOD | 2255 | — | — |
| 406-734 | CARTER | 2255 | — | — |
| 406-735 | GEYSER | 2255 | — | — |
| 406-736 | STOCKETT | 2255 | — | Yes |
| 406-738 | RAYNESFORD | 2255 | — | — |
| 406-753 | BRADY | 2255 | — | — |
| 406-835 | MELROSE | 2255 | — | — |
| 406-842 | SHERIDAN | 2255 | — | Yes |
| 406-843 | VIRGINIACY | 2255 | — | — |
| 406-993 | BIG SKY | 2255 | — | Yes |
| 406-995 | BIG SKY | 2255 | — | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.