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35 prefixes in 657 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 657-204 | HUNTITNBCH | 981E | 2010-04-14 | Yes |
| 657-210 | SANTA ANA | 981E | 2010-11-11 | Yes |
| 657-214 | CYPRESS | 981E | 2010-11-11 | Yes |
| 657-216 | PLACENTIA | 981E | 2011-04-04 | Yes |
| 657-217 | FULLERTON | 981E | 2011-07-18 | Yes |
| 657-226 | PLACENTIA | 981E | 2014-03-03 | Yes |
| 657-229 | SANTA ANA | 981E | 2010-02-23 | Yes |
| 657-234 | YORBALINDA | 981E | 2014-03-21 | Yes |
| 657-235 | SANTA ANA | 981E | 2011-07-22 | Yes |
| 657-267 | SANTA ANA | 981E | — | Yes |
| 657-284 | ORANGE | 981E | 2015-07-30 | Yes |
| 657-333 | ORANGE | 981E | — | Yes |
| 657-339 | HUNTITNBCH | 981E | 2016-08-15 | Yes |
| 657-359 | SILVERADO | 981E | 2018-06-12 | Yes |
| 657-366 | YORBALINDA | 981E | 2018-09-25 | Yes |
| 657-373 | PLACENTIA | 981E | 2019-03-11 | Yes |
| 657-444 | PLACENTIA | 981E | — | Yes |
| 657-452 | BUENA PARK | 981E | 2020-08-21 | Yes |
| 657-464 | HUNTITNBCH | 981E | — | Yes |
| 657-514 | BUENA PARK | 981E | 2021-07-29 | Yes |
| 657-522 | YORBALINDA | 981E | 2018-03-13 | Yes |
| 657-529 | BUENA PARK | 981E | — | Yes |
| 657-535 | YORBALINDA | 981E | 2021-08-23 | Yes |
| 657-549 | ANAHEIM | 981E | 2010-02-23 | Yes |
| 657-571 | YORBALINDA | 981E | 2022-03-11 | Yes |
| 657-613 | CYPRESS | 981E | 2022-07-26 | Yes |
| 657-620 | CYPRESS | 981E | 2022-10-27 | Yes |
| 657-629 | WESTMINSTR | 981E | 2022-10-27 | Yes |
| 657-631 | FULLERTON | 981E | 2022-09-20 | Yes |
| 657-632 | FULLERTON | 981E | 2022-10-28 | Yes |
| 657-722 | GARDEN GRV | 981E | — | Yes |
| 657-777 | CYPRESS | 981E | — | Yes |
| 657-888 | ORANGE | 981E | — | Yes |
| 657-900 | SANTA ANA | 981E | — | Yes |
| 657-999 | ANAHEIM | 981E | — | 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.