All assignees
768 prefixes in 603 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 603-601 | HAMPTON | 829J | — | Yes |
| 603-602 | ROCHESTER | 8299 | 2020-12-04 | Yes |
| 603-604 | RYE BEACH | 5113 | — | Yes |
| 603-605 | DOVER | 927H | — | Yes |
| 603-606 | MANCHESTER | 624H | — | Yes |
| 603-607 | WCHESTEFLD | 478J | 2020-08-13 | Yes |
| 603-608 | NORTHWOOD | 5562 | 2002-01-22 | Yes |
| 603-609 | DOVER | 4036 | — | Yes |
| 603-610 | PORTSMOUTH | 829J | — | Yes |
| 603-611 | XXXXXXXXXX | MULT | — | — |
| 603-612 | PLAISTOW | 829J | — | Yes |
| 603-613 | COLEBROOK | 7778 | — | Yes |
| 603-614 | WCHESTEFLD | 4017 | — | Yes |
| 603-615 | MANCHESTER | 5113 | — | — |
| 603-616 | LITTLETON | 6290 | — | Yes |
| 603-617 | DOVER | 829J | — | Yes |
| 603-618 | PIKE | 4017 | — | Yes |
| 603-619 | LACONIA | 318J | 2022-09-01 | Yes |
| 603-620 | MERRIMACK | 6290 | — | Yes |
| 603-621 | MANCHESTER | 5113 | — | — |
| 603-622 | MANCHESTER | 5113 | — | — |
| 603-623 | MANCHESTER | 5113 | — | — |
| 603-624 | MANCHESTER | 5113 | — | — |
| 603-625 | MANCHESTER | 5113 | — | — |
| 603-626 | MANCHESTER | 5113 | — | — |
| 603-627 | MANCHESTER | 5113 | — | — |
| 603-628 | MANCHESTER | 5113 | — | — |
| 603-629 | MANCHESTER | 5113 | — | — |
| 603-630 | LACONIA | 6386 | 2002-01-22 | Yes |
| 603-631 | LANCASTER | 6290 | 2002-02-22 | Yes |
| 603-632 | ENFIELD | 5113 | — | Yes |
| 603-633 | MILFORD | 6386 | 2022-04-21 | Yes |
| 603-634 | MANCHESTER | 5113 | — | Yes |
| 603-635 | PELHAM | 5113 | — | Yes |
| 603-636 | GROVETON | 5113 | — | Yes |
| 603-637 | BEDFORD | 7778 | — | Yes |
| 603-638 | MONROE | 5113 | — | Yes |
| 603-639 | MANCHESTER | 5113 | — | — |
| 603-640 | HANOVER | 5113 | — | Yes |
| 603-641 | MANCHESTER | 5113 | — | — |
| 603-642 | KINGSTON | 5113 | — | Yes |
| 603-643 | HANOVER | 5113 | — | — |
| 603-644 | MANCHESTER | 5113 | — | — |
| 603-645 | MANCHESTER | 5113 | — | — |
| 603-646 | HANOVER | 5113 | — | — |
| 603-647 | MANCHESTER | 5113 | — | — |
| 603-648 | SALISBURY | 0045 | — | Yes |
| 603-649 | JAFFREY | 318J | 2022-09-29 | Yes |
| 603-650 | HANOVER | 5113 | — | — |
| 603-651 | CTROSSIPEE | 6290 | — | Yes |
| 603-652 | MILTON | 5113 | — | Yes |
| 603-653 | HANOVER | 5113 | — | Yes |
| 603-654 | WILTON | 0050 | — | Yes |
| 603-655 | MANCHESTER | 5113 | — | — |
| 603-656 | MANCHESTER | 383J | — | Yes |
| 603-657 | MANCHESTER | 829J | — | Yes |
| 603-658 | EXETER | 8468 | — | — |
| 603-659 | NEWMARKET | 5113 | — | — |
| 603-660 | GOFFSTOWN | 6386 | 2002-02-22 | Yes |
| 603-661 | MANCHESTER | 6889 | — | Yes |
| 603-662 | CONWAY | 6290 | — | Yes |
| 603-663 | MANCHESTER | 5113 | — | Yes |
| 603-664 | BARRINGTON | 5113 | — | Yes |
| 603-665 | MANCHESTER | 5113 | — | Yes |
| 603-666 | MANCHESTER | 5113 | — | — |
| 603-667 | LEBANON | 7778 | — | Yes |
| 603-668 | MANCHESTER | 5113 | — | — |
| 603-669 | MANCHESTER | 5113 | — | — |
| 603-670 | MERRIMACK | 829J | — | Yes |
| 603-671 | FRANKLIN | 7778 | — | Yes |
| 603-672 | MILFORD | 5113 | — | — |
| 603-673 | MILFORD | 5113 | — | — |
| 603-674 | MANCHESTER | 6889 | — | Yes |
| 603-675 | PLAINFIELD | 5113 | — | Yes |
| 603-676 | HANOVER | 8468 | — | Yes |
| 603-677 | MEREDITH | 7778 | — | Yes |
| 603-678 | LEBANON | 4017 | — | Yes |
| 603-679 | EPPING | 5113 | — | Yes |
| 603-680 | HILLSBORO | 631H | — | Yes |
| 603-681 | SALEM | 829J | — | Yes |
| 603-682 | MANCHESTER | 6889 | — | Yes |
| 603-683 | MERRIMACK | 5113 | — | — |
| 603-684 | LANCASTER | 4017 | — | Yes |
| 603-685 | SALEM | 829J | — | Yes |
| 603-686 | EXETER | 6386 | 2002-09-12 | Yes |
| 603-687 | JACKSON | 8468 | — | Yes |
| 603-688 | CONCORD | 927H | 2021-02-24 | Yes |
| 603-689 | NASHUA | 829J | — | Yes |
| 603-690 | CLAREMONT | 7778 | — | Yes |
| 603-691 | EXETER | 939H | — | Yes |
| 603-692 | SOMERSWTH | 5113 | — | Yes |
| 603-693 | EPPING | 829J | — | Yes |
| 603-694 | CHATHAM | 3316 | — | Yes |
| 603-695 | MANCHESTER | 5113 | — | — |
| 603-696 | MANCHESTER | 637E | 2021-05-17 | Yes |
| 603-697 | DOVER | 318J | 2022-10-06 | Yes |
| 603-698 | MANCHESTER | 732J | — | Yes |
| 603-699 | NASHUA | 732J | — | Yes |
| 603-700 | — | — | ||
| 603-701 | NEW DURHAM | 314C | 2009-10-22 | 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.