QWEST CORPORATION
132 prefixes in 406 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 406-222 | LIVINGSTON | 9636 | — | — |
| 406-225 | BOULDER | 9636 | — | Yes |
| 406-226 | EGLACIERPK | 9636 | — | Yes |
| 406-227 | HELENA | 9636 | — | — |
| 406-232 | MILES CITY | 9636 | — | — |
| 406-233 | MILES CITY | 9636 | — | Yes |
| 406-235 | WOLF CREEK | 9636 | — | Yes |
| 406-237 | BILLINGS | 9636 | — | — |
| 406-238 | BILLINGS | 9636 | — | — |
| 406-243 | MISSOULA | 9636 | — | — |
| 406-245 | BILLINGS | 9636 | — | — |
| 406-247 | BILLINGS | 9636 | — | Yes |
| 406-248 | BILLINGS | 9636 | — | Yes |
| 406-251 | MISSOULA | 9636 | — | — |
| 406-252 | BILLINGS | 9636 | — | — |
| 406-254 | BILLINGS | 9636 | — | — |
| 406-255 | BILLINGS | 9636 | — | — |
| 406-256 | BILLINGS | 9636 | — | — |
| 406-258 | MISSOULA | 9636 | — | Yes |
| 406-259 | BILLINGS | 9636 | — | — |
| 406-262 | HAVRE | 9636 | — | Yes |
| 406-265 | HAVRE | 9636 | — | — |
| 406-266 | TOWNSEND | 9636 | — | Yes |
| 406-268 | GREATFALLS | 9636 | — | Yes |
| 406-273 | MISSOULA | 9636 | — | Yes |
| 406-278 | CONRAD | 9636 | — | Yes |
| 406-282 | MANHATTAN | 9636 | — | Yes |
| 406-284 | MANHATTAN | 9636 | — | Yes |
| 406-285 | THREEFORKS | 9636 | — | Yes |
| 406-287 | WHITEHALL | 9636 | — | Yes |
| 406-322 | COLUMBUS | 9636 | — | Yes |
| 406-324 | HELENA | 9636 | — | Yes |
| 406-327 | MISSOULA | 9636 | — | — |
| 406-329 | MISSOULA | 9636 | — | — |
| 406-333 | LIVINGSTON | 9636 | — | Yes |
| 406-356 | FORSYTH | 9636 | — | Yes |
| 406-359 | GLENDIVE | 9636 | — | Yes |
| 406-363 | HAMILTON | 9636 | — | Yes |
| 406-365 | GLENDIVE | 9636 | — | Yes |
| 406-373 | BILLINGS | 9636 | — | Yes |
| 406-375 | HAMILTON | 9636 | — | Yes |
| 406-388 | BELGRADE | 9636 | — | — |
| 406-413 | BILLINGS | 9636 | 2015-05-12 | Yes |
| 406-414 | BOZEMAN | 9636 | 2011-12-07 | Yes |
| 406-434 | SHELBY | 9636 | — | Yes |
| 406-441 | HELENA | 9636 | — | — |
| 406-442 | HELENA | 9636 | — | — |
| 406-443 | HELENA | 9636 | — | — |
| 406-444 | HELENA | 9636 | — | — |
| 406-445 | RED LODGE | 9636 | — | Yes |
| 406-446 | RED LODGE | 9636 | — | Yes |
| 406-447 | HELENA | 9636 | — | Yes |
| 406-449 | HELENA | 9636 | — | — |
| 406-452 | GREATFALLS | 9636 | — | — |
| 406-453 | GREATFALLS | 9636 | — | — |
| 406-454 | GREATFALLS | 9636 | — | — |
| 406-455 | GREATFALLS | 9636 | — | Yes |
| 406-457 | HELENA | 9636 | — | Yes |
| 406-458 | HELENA | 9636 | — | Yes |
| 406-468 | CASCADE | 9636 | — | Yes |
| 406-475 | HELENA | 9636 | — | Yes |
| 406-476 | DUTTON | 9636 | — | Yes |
| 406-482 | SIDNEY | 9636 | — | Yes |
| 406-494 | BUTTE | 9636 | — | — |
| 406-495 | HELENA | 9636 | — | Yes |
| 406-496 | BUTTE | 9636 | — | Yes |
| 406-497 | BUTTE | 9636 | — | Yes |
| 406-522 | BOZEMAN | 9636 | — | — |
| 406-523 | MISSOULA | 9636 | — | — |
| 406-533 | BUTTE | 9636 | — | Yes |
| 406-538 | LEWISTOWN | 9636 | — | Yes |
| 406-542 | MISSOULA | 9636 | — | — |
| 406-543 | MISSOULA | 9636 | — | — |
| 406-548 | BOZEMAN | 9636 | — | Yes |
| 406-549 | MISSOULA | 9636 | — | — |
| 406-556 | BOZEMAN | 9636 | — | — |
| 406-563 | ANACONDA | 9636 | — | Yes |
| 406-574 | SILVERTIP | 9636 | — | Yes |
| 406-578 | WILSALL | 9636 | — | Yes |
| 406-582 | BOZEMAN | 9636 | — | — |
| 406-585 | BOZEMAN | 9636 | — | — |
| 406-586 | BOZEMAN | 9636 | — | — |
| 406-587 | BOZEMAN | 9636 | — | — |
| 406-626 | FRENCHTOWN | 9636 | — | Yes |
| 406-628 | LAUREL | 9636 | — | Yes |
| 406-633 | LAUREL | 9636 | — | Yes |
| 406-637 | TERRY | 9636 | — | Yes |
| 406-642 | VICTOR | 9636 | — | Yes |
| 406-646 | WYELLOWSTN | 9636 | — | Yes |
| 406-651 | BILLINGS | 9636 | — | Yes |
| 406-652 | BILLINGS | 9636 | — | — |
| 406-655 | BILLINGS | 9636 | — | — |
| 406-656 | BILLINGS | 9636 | — | — |
| 406-657 | BILLINGS | 9636 | — | — |
| 406-659 | NO PARKMAN | 9636 | — | Yes |
| 406-662 | BRIDGER | 9636 | — | Yes |
| 406-665 | HARDIN | 9636 | — | Yes |
| 406-668 | FROMBERG | 9636 | — | Yes |
| 406-683 | DILLON | 9636 | — | — |
| 406-686 | CLYDE PARK | 9636 | — | 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.