All assignees
768 prefixes in 603 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 603-400 | HOLLIS | 792K | 2011-08-31 | Yes |
| 603-401 | SALEM | 6386 | 2001-10-17 | Yes |
| 603-402 | NASHUA | 6386 | 2012-09-06 | Yes |
| 603-403 | ROCHESTER | 318J | 2018-07-31 | Yes |
| 603-404 | DERRY | 6386 | 2016-01-04 | Yes |
| 603-405 | SOMERSWTH | 8299 | 2016-04-20 | Yes |
| 603-406 | CONCORD | 6889 | 2018-12-21 | Yes |
| 603-407 | BELMONT | 829J | 2015-05-06 | Yes |
| 603-408 | BERLIN | 4036 | 2015-12-09 | Yes |
| 603-409 | LACONIA | 4036 | 2015-10-13 | Yes |
| 603-410 | CONCORD | 829J | — | Yes |
| 603-411 | XXXXXXXXXX | MULT | — | — |
| 603-412 | PLYMOUTH | 6290 | — | Yes |
| 603-413 | MANCHESTER | 829J | — | Yes |
| 603-414 | SUNAPEE | 520K | — | Yes |
| 603-415 | CONCORD | 8468 | — | — |
| 603-416 | RAYMOND | 6889 | 2018-12-21 | Yes |
| 603-417 | NASHUA | 6889 | 2015-04-14 | Yes |
| 603-418 | EXETER | 829J | — | Yes |
| 603-419 | SUNCOOK | 6290 | — | Yes |
| 603-420 | MERRIMACK | 7778 | — | Yes |
| 603-421 | DERRY | 5113 | — | Yes |
| 603-422 | PORTSMOUTH | 5113 | — | Yes |
| 603-423 | MERRIMACK | 5113 | — | Yes |
| 603-424 | MERRIMACK | 5113 | — | — |
| 603-425 | DERRY | 5113 | — | Yes |
| 603-426 | DERRY | 5113 | — | Yes |
| 603-427 | PORTSMOUTH | 5113 | — | Yes |
| 603-428 | HENNIKER | 3320 | — | Yes |
| 603-429 | MERRIMACK | 5113 | — | — |
| 603-430 | PORTSMOUTH | 5113 | — | — |
| 603-431 | PORTSMOUTH | 5113 | — | — |
| 603-432 | DERRY | 5113 | — | — |
| 603-433 | PORTSMOUTH | 5113 | — | — |
| 603-434 | DERRY | 5113 | — | — |
| 603-435 | PITTSFIELD | 5113 | — | Yes |
| 603-436 | PORTSMOUTH | 5113 | — | — |
| 603-437 | DERRY | 5113 | — | — |
| 603-438 | NASHUA | 6889 | — | Yes |
| 603-439 | KEENE | 829J | — | Yes |
| 603-440 | MERRIMACK | 5113 | — | Yes |
| 603-441 | ROCHESTER | 318J | 2021-09-09 | Yes |
| 603-442 | LEBANON | 5113 | — | Yes |
| 603-443 | LEBANON | 5113 | — | Yes |
| 603-444 | LITTLETON | 5113 | — | — |
| 603-445 | NO WALPOLE | 5113 | — | Yes |
| 603-446 | MARLOW | 5113 | — | Yes |
| 603-447 | CONWAY | 5113 | — | Yes |
| 603-448 | LEBANON | 5113 | — | — |
| 603-449 | MILAN | 5113 | — | Yes |
| 603-450 | CONCORD | 6889 | 2018-09-11 | Yes |
| 603-451 | CONCORD | 4036 | 2020-04-08 | Yes |
| 603-452 | CONWAY | 8468 | — | Yes |
| 603-453 | HAMPSTEAD | 7421 | — | Yes |
| 603-454 | SUNAPEE | 6290 | — | Yes |
| 603-455 | LACONIA | 6290 | — | Yes |
| 603-456 | WARNER | 0047 | — | Yes |
| 603-457 | DOVER | 314C | 2020-11-27 | Yes |
| 603-458 | SALEM | 318J | — | Yes |
| 603-459 | NASHUA | 829J | — | Yes |
| 603-460 | DEERFIELD | 7778 | — | Yes |
| 603-461 | MERRIMACK | 6290 | — | Yes |
| 603-462 | DEERFIELD | 8468 | — | Yes |
| 603-463 | DEERFIELD | 5113 | — | Yes |
| 603-464 | HILLSBORO | 3320 | — | Yes |
| 603-465 | HOLLIS | 3321 | — | Yes |
| 603-466 | GORHAM | 5113 | — | Yes |
| 603-467 | MANCHESTER | 700J | — | Yes |
| 603-468 | SEABROOK | 8468 | — | Yes |
| 603-469 | MERIDEN | 0045 | — | Yes |
| 603-470 | CONCORD | 6290 | 2001-04-19 | Yes |
| 603-471 | BEDFORD | 5113 | — | Yes |
| 603-472 | BEDFORD | 5113 | — | Yes |
| 603-473 | MILTON ML | 5113 | — | Yes |
| 603-474 | SEABROOK | 5113 | — | Yes |
| 603-475 | SALEM | 6386 | — | — |
| 603-476 | CTRSANDWIH | 5113 | — | Yes |
| 603-477 | CLAREMONT | 6290 | — | Yes |
| 603-478 | HLLSBUPVLG | 0039 | — | — |
| 603-479 | DERRY | 4036 | — | — |
| 603-480 | MANCHESTER | 996E | — | — |
| 603-481 | PLYMOUTH | 6386 | — | Yes |
| 603-482 | ERROL | 5113 | — | Yes |
| 603-483 | CANDIA | 5113 | — | Yes |
| 603-484 | NASHUA | 6386 | 2016-09-21 | Yes |
| 603-485 | SUNCOOK | 5113 | — | Yes |
| 603-486 | MANCHESTER | 6290 | — | Yes |
| 603-487 | NEW BOSTON | 5113 | — | Yes |
| 603-488 | BEDFORD | 318J | — | Yes |
| 603-489 | HAMPSTEAD | 318J | — | Yes |
| 603-490 | DERRY | 6386 | — | — |
| 603-491 | CONCORD | 6386 | — | — |
| 603-492 | MANCHESTER | 5113 | — | — |
| 603-493 | MERRIMACK | 6386 | — | — |
| 603-494 | MERRIMACK | 6386 | — | — |
| 603-495 | WASHINGTON | 0039 | — | — |
| 603-496 | CONCORD | 6386 | — | — |
| 603-497 | GOFFSTOWN | 5113 | — | Yes |
| 603-498 | PORTSMOUTH | 6386 | — | — |
| 603-499 | KEENE | 4017 | — | 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.