All assignees
110 prefixes in 564 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 564-777 | CASTLEROCK | 145J | 2019-04-16 | Yes |
| 564-811 | XXXXXXXXXX | MULT | — | — |
| 564-888 | VANCOUVER | 145J | 2018-12-28 | Yes |
| 564-900 | MT VERNON | 624H | 2021-11-22 | Yes |
| 564-911 | XXXXXXXXXX | MULT | — | — |
| 564-950 | — | — | ||
| 564-958 | — | — | ||
| 564-959 | — | — | ||
| 564-976 | — | — | ||
| 564-999 | OLYMPIA | 145J | 2019-02-25 | 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.