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29 prefixes in 510 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 510-210 | RICHMOND | 981E | 2013-01-04 | Yes |
| 510-244 | HAYWARD | 981E | 2011-07-25 | Yes |
| 510-255 | RICHMOND | 981E | 2011-04-28 | Yes |
| 510-256 | CROCKETT | 981E | — | Yes |
| 510-398 | HAYWARD | 981E | 2012-08-17 | Yes |
| 510-402 | FRNK MAIN | 981E | — | Yes |
| 510-470 | HAYWARD | 981E | 2010-02-22 | Yes |
| 510-516 | FRNK MAIN | 981E | 2010-09-03 | Yes |
| 510-626 | OKLD TRNID | 981E | 2016-07-29 | Yes |
| 510-646 | OKLD BKLY | 981E | 2013-03-07 | Yes |
| 510-671 | OKLD ALMD | 981E | 2013-05-14 | Yes |
| 510-722 | CROCKETT | 981E | — | Yes |
| 510-730 | RICHMOND | 981E | 2010-02-22 | Yes |
| 510-766 | FRNK MAIN | 981E | 2015-03-25 | Yes |
| 510-775 | OKLD ALMD | 981E | 2012-09-14 | Yes |
| 510-831 | RICHMOND | 981E | 2020-12-11 | Yes |
| 510-838 | OKLD FRTVL | 981E | 2014-02-28 | Yes |
| 510-854 | ELSBR-PINL | 981E | — | Yes |
| 510-899 | OKLD MN-PD | 981E | — | Yes |
| 510-901 | HAYWARD | 981E | 2016-07-29 | Yes |
| 510-925 | HAYWARD | 981E | 2014-09-18 | Yes |
| 510-929 | OKLD MN-PD | 981E | 2018-03-13 | Yes |
| 510-937 | CROCKETT | 981E | 2015-06-09 | Yes |
| 510-939 | HRCUL-RODE | 981E | 2015-03-25 | Yes |
| 510-956 | OKLD ALMD | 981E | 2019-01-17 | Yes |
| 510-961 | FRNK GRNLF | 981E | 2019-04-17 | Yes |
| 510-983 | FRNK OLIVR | 981E | 2019-02-06 | Yes |
| 510-992 | OKLD MN-PD | 981E | — | Yes |
| 510-994 | RICHMOND | 981E | 2019-07-26 | 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.