All assignees
799 prefixes in 631 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 631-500 | WATER MILL | 384C | — | Yes |
| 631-501 | FARMINGDL | 9104 | — | Yes |
| 631-502 | JAMESPORT | 473G | 2012-03-16 | Yes |
| 631-503 | CTRMORICHS | 7140 | — | Yes |
| 631-504 | YAPHANK | 612K | 2006-05-23 | Yes |
| 631-505 | LINDENHST | 997E | 2010-02-24 | Yes |
| 631-506 | RIVERHEAD | 9104 | — | Yes |
| 631-507 | AMITYVILLE | 6622 | 2013-06-27 | Yes |
| 631-508 | RIVERHEAD | 6959 | 2018-03-13 | Yes |
| 631-509 | PTJEFFERSN | 612K | 2006-08-21 | Yes |
| 631-510 | MIDLAND | 7133 | — | Yes |
| 631-511 | XXXXXXXXXX | MULT | — | — |
| 631-512 | SELDEN | 4036 | 2006-02-08 | Yes |
| 631-513 | BRENTWOOD | 4006 | — | Yes |
| 631-514 | BRENTWOOD | 7133 | — | Yes |
| 631-515 | SHELTER IS | 384C | 2012-10-31 | Yes |
| 631-516 | SELDEN | 384C | 2024-03-20 | Yes |
| 631-517 | BABYLON | 4006 | — | Yes |
| 631-518 | BAY SHORE | 155E | 2013-04-03 | Yes |
| 631-519 | E FIRE IS | 155E | 2013-04-03 | Yes |
| 631-520 | AMITYVILLE | 4006 | — | Yes |
| 631-521 | BRENTWOOD | 8473 | — | Yes |
| 631-522 | DEER PARK | 612K | 2009-04-02 | Yes |
| 631-523 | CENTRAISLP | 6622 | — | Yes |
| 631-524 | BRENTWOOD | 4036 | 2011-07-18 | Yes |
| 631-525 | BRENTWOOD | 4006 | 2003-11-04 | Yes |
| 631-526 | BABYLON | 384C | 2012-10-22 | Yes |
| 631-527 | E HAMPTON | 612K | 2011-06-03 | Yes |
| 631-528 | KINGS PARK | 7133 | — | Yes |
| 631-529 | ORIENT | 384C | — | Yes |
| 631-530 | AMITYVILLE | 6622 | 2015-11-24 | Yes |
| 631-531 | FARMINGDL | 9104 | — | Yes |
| 631-532 | AMITYVILLE | 829J | — | Yes |
| 631-533 | CENTRAISLP | 7133 | 2009-02-09 | Yes |
| 631-534 | COLDSPGHBR | 7133 | — | Yes |
| 631-535 | PTJEFFERSN | 155E | 2012-09-06 | Yes |
| 631-536 | EASTPORT | 4006 | — | Yes |
| 631-537 | BRIDGEMPTN | 9104 | — | — |
| 631-538 | SELDEN | 4036 | — | Yes |
| 631-539 | BABYLON | 7126 | — | Yes |
| 631-540 | MATTITUCK | 384C | 2020-05-12 | Yes |
| 631-541 | NASSAUZN09 | 9104 | — | Yes |
| 631-542 | RONKONKOMA | 473G | 2012-03-16 | Yes |
| 631-543 | COMMACK | 9104 | — | — |
| 631-544 | KINGS PARK | 9104 | — | Yes |
| 631-545 | AMITYVILLE | 155E | 2012-08-20 | Yes |
| 631-546 | HUNTINGTON | 4006 | — | Yes |
| 631-547 | HUNTINGTON | 9104 | — | Yes |
| 631-548 | RIVERHEAD | 9104 | — | Yes |
| 631-549 | HUNTINGTON | 9104 | — | — |
| 631-550 | YAPHANK | 452J | 2020-03-04 | Yes |
| 631-551 | ST JAMES | 7133 | — | Yes |
| 631-552 | AMITYVILLE | 6622 | 2013-08-22 | Yes |
| 631-553 | BRENTWOOD | 6959 | — | — |
| 631-554 | BRENTWOOD | 6630 | — | — |
| 631-555 | DIR ASST | MULT | — | — |
| 631-556 | BRENTWOOD | 0059 | 2005-11-15 | — |
| 631-557 | AMAGANSETT | 384C | — | Yes |
| 631-558 | RIVERHEAD | 6630 | — | — |
| 631-559 | BRENTWOOD | 4036 | 2006-03-30 | Yes |
| 631-560 | BRENTWOOD | 6959 | 2006-09-19 | Yes |
| 631-561 | SELDEN | 7140 | — | Yes |
| 631-562 | PATCHOGUE | 612K | 2011-10-06 | Yes |
| 631-563 | SAYVILLE | 9104 | — | — |
| 631-564 | SAYVILLE | 829J | — | — |
| 631-565 | AMITYVILLE | 6622 | 2009-05-19 | Yes |
| 631-566 | RIVERHEAD | 8473 | 2006-01-05 | Yes |
| 631-567 | SAYVILLE | 9104 | — | — |
| 631-568 | AMITYVILLE | 321J | — | Yes |
| 631-569 | PATCHOGUE | 4006 | 2006-05-19 | Yes |
| 631-570 | FIREISLAND | 4006 | — | Yes |
| 631-571 | ORIENT | 155E | 2013-04-03 | Yes |
| 631-572 | BABYLON | 6622 | 2009-05-27 | Yes |
| 631-573 | SAYVILLE | 612K | 2011-10-06 | Yes |
| 631-574 | RIVERHEAD | 829J | — | Yes |
| 631-575 | BRENTWOOD | 5562 | 2008-09-30 | Yes |
| 631-576 | PATCHOGUE | 7133 | — | Yes |
| 631-577 | FARMINGDL | 9104 | — | Yes |
| 631-578 | YAPHANK | 6622 | 2007-04-26 | Yes |
| 631-579 | BRENTWOOD | 4036 | 2008-11-14 | Yes |
| 631-580 | RONKONKOMA | 9104 | — | — |
| 631-581 | ISLIP | 9104 | — | — |
| 631-582 | CENTRAISLP | 9104 | — | — |
| 631-583 | FIREISLAND | 9104 | — | Yes |
| 631-584 | ST JAMES | 9104 | — | Yes |
| 631-585 | RONKONKOMA | 9104 | — | — |
| 631-586 | DEER PARK | 9104 | — | — |
| 631-587 | BABYLON | 9104 | — | — |
| 631-588 | RONKONKOMA | 9104 | — | — |
| 631-589 | SAYVILLE | 9104 | — | — |
| 631-590 | RONKONKOMA | 4006 | — | Yes |
| 631-591 | RIVERHEAD | 7126 | — | Yes |
| 631-592 | LINDENHST | 7126 | — | Yes |
| 631-593 | GREENPORT | 4006 | — | Yes |
| 631-594 | HAMPTNBAYS | 612K | 2001-03-15 | Yes |
| 631-595 | DEER PARK | 9104 | — | Yes |
| 631-596 | QUOGUE | 7133 | 2006-01-13 | Yes |
| 631-597 | E FIRE IS | 9104 | — | Yes |
| 631-598 | AMITYVILLE | 9104 | — | Yes |
| 631-599 | RIVERHEAD | 6959 | — | 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.