FRONTIER CALIFORNIA INC.
22 prefixes in 559 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 559-332 | SQUAW VLY | 2319 | — | Yes |
| 559-335 | GRANTGROVE | 2319 | — | Yes |
| 559-336 | MIRANTPHST | 2319 | — | Yes |
| 559-337 | BADGER | 2319 | — | Yes |
| 559-338 | DUNLAP | 2319 | — | Yes |
| 559-562 | LINDSAY | 2319 | — | — |
| 559-568 | LINDSAY | 2319 | — | Yes |
| 559-592 | EXETER | 4420 | — | — |
| 559-594 | EXETER | 4420 | — | Yes |
| 559-597 | LEMON COVE | 4420 | — | Yes |
| 559-637 | REEDLEY | 2319 | — | — |
| 559-638 | REEDLEY | 2319 | — | — |
| 559-643 | REEDLEY | 2319 | — | Yes |
| 559-693 | SANJOAQUIN | 4420 | — | Yes |
| 559-698 | SANJOAQUIN | 4420 | — | Yes |
| 559-787 | TIVYVALLEY | 4420 | — | Yes |
| 559-829 | SANJOAQUIN | 4420 | — | Yes |
| 559-834 | FOWLER | 2319 | — | Yes |
| 559-875 | SANGER | 4420 | — | — |
| 559-876 | SANGER | 4420 | — | Yes |
| 559-949 | ALPAUGH | 4420 | — | Yes |
| 559-992 | CORCORAN | 4420 | — | 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.