All assignees
799 prefixes in 631 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 631-600 | W COMMACK | 384C | — | Yes |
| 631-601 | BRENTWOOD | 4036 | 2012-11-29 | Yes |
| 631-602 | SHELTER IS | 7133 | 2006-02-03 | Yes |
| 631-603 | RIVERHEAD | 829J | — | Yes |
| 631-604 | E HAMPTON | 612K | 2006-01-11 | Yes |
| 631-605 | PATCHOGUE | 4036 | 2009-05-13 | Yes |
| 631-606 | NORTHPORT | 612K | 2009-04-17 | Yes |
| 631-607 | WADING RIV | 7140 | 2018-09-06 | Yes |
| 631-608 | AMITYVILLE | 7126 | — | Yes |
| 631-609 | BRENTWOOD | 6959 | 2008-09-08 | Yes |
| 631-610 | EASTPORT | 4006 | — | Yes |
| 631-611 | XXXXXXXXXX | MULT | — | — |
| 631-612 | BABYLON | 4006 | — | Yes |
| 631-613 | BRIDGEMPTN | 384C | — | Yes |
| 631-614 | SOUTHAMPTN | 384C | — | — |
| 631-615 | RONKONKOMA | 4006 | — | Yes |
| 631-616 | PECONIC | 7133 | 2006-01-13 | Yes |
| 631-617 | BRENTWOOD | 6959 | 2006-08-21 | Yes |
| 631-618 | YAPHANK | 4006 | — | Yes |
| 631-619 | RONKONKOMA | 7140 | — | Yes |
| 631-620 | BABYLON | 7126 | 2011-06-22 | Yes |
| 631-621 | ST JAMES | 7133 | — | Yes |
| 631-622 | FARMINGDL | 7126 | — | — |
| 631-623 | W COMMACK | 7140 | — | Yes |
| 631-624 | BRENTWOOD | 6959 | 2008-06-30 | Yes |
| 631-625 | ORIENT | 384C | — | Yes |
| 631-626 | BRENTWOOD | 6959 | 2008-05-12 | Yes |
| 631-627 | PATCHOGUE | 7126 | 2005-11-03 | Yes |
| 631-628 | NORTHPORT | 7133 | — | Yes |
| 631-629 | HUNTINGTON | 612K | 2007-10-31 | Yes |
| 631-630 | CENTRAISLP | 7126 | — | — |
| 631-631 | FIREISLAND | 997E | 2022-10-11 | Yes |
| 631-632 | STONYBROOK | 9104 | — | Yes |
| 631-633 | BELLPORT | 829J | 2014-03-03 | Yes |
| 631-634 | COMMACK | 7126 | 2019-10-09 | Yes |
| 631-635 | BABYLON | 7126 | — | Yes |
| 631-636 | BRENTWOOD | 4036 | 2014-12-15 | Yes |
| 631-637 | BRENTWOOD | 7133 | 2014-04-28 | Yes |
| 631-638 | STONYBROOK | 9104 | 2005-10-05 | Yes |
| 631-639 | BRENTWOOD | 7140 | — | Yes |
| 631-640 | AMITYVILLE | 6622 | 2017-03-28 | Yes |
| 631-641 | WATER MILL | 997E | — | Yes |
| 631-642 | PTJEFFERSN | 9104 | — | Yes |
| 631-643 | MIDLAND | 9104 | — | — |
| 631-644 | RIVERHEAD | 6959 | 2014-10-14 | Yes |
| 631-645 | BRENTWOOD | 6622 | — | — |
| 631-646 | SAYVILLE | 384C | 2020-05-28 | Yes |
| 631-647 | BAY SHORE | 7126 | — | Yes |
| 631-648 | RONKONKOMA | 7126 | — | Yes |
| 631-649 | BABYLON | 4006 | — | Yes |
| 631-650 | ISLIP | 7126 | — | Yes |
| 631-651 | NORTHPORT | 612K | — | Yes |
| 631-652 | SMITHTOWN | 7133 | 2014-01-13 | Yes |
| 631-653 | QUOGUE | 9104 | — | Yes |
| 631-654 | PATCHOGUE | 9104 | — | Yes |
| 631-655 | RIVERHEAD | 7140 | — | Yes |
| 631-656 | SMITHTOWN | 7126 | — | Yes |
| 631-657 | ATLANTIC | 4006 | — | Yes |
| 631-658 | E HAMPTON | 612K | 2013-07-11 | Yes |
| 631-659 | COLDSPGHBR | 7126 | — | Yes |
| 631-660 | RIVERHEAD | 6622 | — | Yes |
| 631-661 | BABYLON | 9104 | — | — |
| 631-662 | HUNTINGTON | 4036 | 2002-10-25 | Yes |
| 631-663 | KINGS PARK | 7126 | — | Yes |
| 631-664 | CENTRAISLP | 6622 | — | Yes |
| 631-665 | BAY SHORE | 9104 | — | — |
| 631-666 | BAY SHORE | 9104 | — | — |
| 631-667 | DEER PARK | 9104 | — | — |
| 631-668 | MONTAUK PT | 9104 | — | Yes |
| 631-669 | BABYLON | 9104 | — | — |
| 631-670 | COMMACK | 7126 | — | Yes |
| 631-671 | LINDENHST | 5562 | 2002-06-17 | Yes |
| 631-672 | SMITHTOWN | 6622 | 2002-06-17 | Yes |
| 631-673 | HUNTINGTON | 9104 | — | — |
| 631-674 | MIDLAND | 7133 | — | Yes |
| 631-675 | STONYBROOK | 7126 | — | Yes |
| 631-676 | RONKONKOMA | 612K | 2004-08-20 | Yes |
| 631-677 | SAYVILLE | 7133 | — | Yes |
| 631-678 | BRENTWOOD | 7133 | — | Yes |
| 631-679 | NASSAUZN09 | 9104 | — | Yes |
| 631-680 | RIVERHEAD | 4036 | 2001-02-14 | — |
| 631-681 | SELDEN | 4036 | 2004-11-08 | Yes |
| 631-682 | SELDEN | 4036 | 2002-03-14 | — |
| 631-683 | HUNTINGTON | 7133 | — | Yes |
| 631-684 | WESTHAMPTN | 155E | 2001-06-23 | Yes |
| 631-685 | HAMPTNBAYS | 384C | — | Yes |
| 631-686 | ST JAMES | 7126 | — | Yes |
| 631-687 | PATCHOGUE | 9104 | — | Yes |
| 631-688 | FARMINGDL | 7140 | — | Yes |
| 631-689 | STONYBROOK | 9104 | — | — |
| 631-690 | PATCHOGUE | 4036 | 2018-10-15 | Yes |
| 631-691 | AMITYVILLE | 9104 | — | Yes |
| 631-692 | COLDSPGHBR | 9104 | — | — |
| 631-693 | AMITYVILLE | 7140 | — | Yes |
| 631-694 | FARMINGDL | 9104 | — | — |
| 631-695 | BRENTWOOD | 6630 | — | — |
| 631-696 | SELDEN | 9104 | — | — |
| 631-697 | HUNTINGTON | 4036 | 2002-01-16 | — |
| 631-698 | SELDEN | 9104 | — | — |
| 631-699 | SAYVILLE | 7133 | — | 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.