QWEST CORPORATION
132 prefixes in 406 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 406-693 | WARM SPG | 9636 | — | Yes |
| 406-721 | MISSOULA | 9636 | — | — |
| 406-723 | BUTTE | 9636 | — | — |
| 406-727 | GREATFALLS | 9636 | — | — |
| 406-728 | MISSOULA | 9636 | — | — |
| 406-732 | ST MARY | 9636 | — | Yes |
| 406-747 | FAIRVIEW | 9636 | — | Yes |
| 406-748 | COLSTRIP | 9636 | — | Yes |
| 406-761 | GREATFALLS | 9636 | — | — |
| 406-763 | GALATNGTWY | 9636 | — | Yes |
| 406-771 | GREATFALLS | 9636 | — | — |
| 406-777 | STEVENSVL | 9636 | — | Yes |
| 406-782 | BUTTE | 9636 | — | — |
| 406-791 | GREATFALLS | 9636 | — | — |
| 406-795 | WIBAUX | 9636 | — | Yes |
| 406-797 | ANACONDA | 9636 | — | Yes |
| 406-821 | DARBY | 9636 | — | Yes |
| 406-823 | LIVINGSTON | 9636 | — | Yes |
| 406-829 | MISSOULA | 9636 | — | — |
| 406-838 | COOKE CITY | 9636 | — | Yes |
| 406-841 | HELENA | 9636 | — | Yes |
| 406-846 | DEER LODGE | 9636 | — | Yes |
| 406-848 | GARDINER | 9636 | — | Yes |
| 406-866 | GREATFALLS | 9636 | — | Yes |
| 406-873 | CUT BANK | 9636 | — | Yes |
| 406-888 | W GLACIER | 9636 | — | Yes |
| 406-896 | BILLINGS | 9636 | — | — |
| 406-933 | HELENA | 9636 | — | Yes |
| 406-961 | HAMILTON | 9636 | — | Yes |
| 406-962 | JOLIET | 9636 | — | Yes |
| 406-964 | GREATFALLS | 9636 | — | Yes |
| 406-994 | BOZEMAN | 9636 | — | — |
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.