FRONTIER CALIFORNIA INC.
156 prefixes in 909 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 909-797 | CALIMESA | 2319 | — | — |
| 909-798 | REDLANDS | 2319 | — | — |
| 909-799 | REDLANDS | 2319 | — | — |
| 909-839 | DIAMONDBAR | 2319 | — | Yes |
| 909-860 | DIAMONDBAR | 2319 | — | — |
| 909-861 | DIAMONDBAR | 2319 | — | — |
| 909-865 | POMONA | 2319 | — | — |
| 909-866 | BIGBEAR LK | 4420 | — | — |
| 909-867 | RUNNINGSPG | 4420 | — | Yes |
| 909-868 | POMONA | 2319 | — | Yes |
| 909-869 | DIAMONDBAR | 2319 | — | — |
| 909-878 | BIGBEAR LK | 4420 | — | Yes |
| 909-880 | MARSHALL | 2319 | — | — |
| 909-881 | MARSHALL | 2319 | — | — |
| 909-882 | MARSHALL | 2319 | — | — |
| 909-883 | MARSHALL | 2319 | — | — |
| 909-884 | S BERNDINO | 2319 | — | — |
| 909-885 | S BERNDINO | 2319 | — | — |
| 909-886 | MARSHALL | 2319 | — | — |
| 909-887 | MARSHALL | 2319 | — | — |
| 909-888 | S BERNDINO | 2319 | — | — |
| 909-889 | S BERNDINO | 2319 | — | — |
| 909-890 | S BERNDINO | 2319 | — | Yes |
| 909-891 | S BERNDINO | 2319 | — | Yes |
| 909-899 | ETIWANDA | 2319 | — | — |
| 909-902 | CHINO | 2319 | — | — |
| 909-920 | UPLAND | 2319 | — | — |
| 909-921 | UPLAND | 2319 | — | Yes |
| 909-923 | ONTARIO | 2319 | — | — |
| 909-930 | ONTARIO | 2319 | — | — |
| 909-931 | UPLAND | 2319 | — | — |
| 909-932 | UPLAND | 2319 | — | — |
| 909-933 | ONTARIO | 2319 | — | Yes |
| 909-937 | ONTARIO | 2319 | — | Yes |
| 909-941 | UPLAND | 2319 | — | — |
| 909-942 | UPLAND | 2319 | — | Yes |
| 909-944 | UPLAND | 2319 | — | — |
| 909-945 | UPLAND | 2319 | — | Yes |
| 909-946 | UPLAND | 2319 | — | — |
| 909-947 | ONTARIO | 2319 | — | — |
| 909-948 | UPLAND | 2319 | — | — |
| 909-949 | UPLAND | 2319 | — | — |
| 909-971 | CLAREMONT | 2319 | — | Yes |
| 909-974 | ONTARIO | 2319 | — | Yes |
| 909-975 | ONTARIO | 2319 | — | Yes |
| 909-979 | DIAMONDBAR | 2319 | — | Yes |
| 909-980 | UPLAND | 2319 | — | — |
| 909-981 | UPLAND | 2319 | — | — |
| 909-982 | UPLAND | 2319 | — | — |
| 909-983 | ONTARIO | 2319 | — | — |
| 909-984 | ONTARIO | 2319 | — | — |
| 909-985 | UPLAND | 2319 | — | — |
| 909-986 | ONTARIO | 2319 | — | — |
| 909-987 | UPLAND | 2319 | — | — |
| 909-988 | ONTARIO | 2319 | — | — |
| 909-989 | UPLAND | 2319 | — | — |
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.