All assignees
768 prefixes in 603 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 603-300 | CHESTER | 5562 | 2003-06-09 | Yes |
| 603-301 | CTROSSIPEE | 4017 | 2001-07-11 | Yes |
| 603-302 | MANCHESTER | 5113 | 2001-09-19 | — |
| 603-303 | RAYMOND | 6386 | 2001-03-09 | — |
| 603-304 | ENFIELD | 6290 | — | Yes |
| 603-305 | NASHUA | 6386 | 2001-08-21 | Yes |
| 603-306 | LEBANON | 8468 | 2006-12-18 | Yes |
| 603-307 | NO CONWAY | 6386 | 2012-09-06 | Yes |
| 603-308 | HANOVER | 5113 | 2014-09-30 | Yes |
| 603-309 | NEWPORT | 6386 | 2013-08-09 | Yes |
| 603-310 | BEDFORD | 829J | — | Yes |
| 603-311 | XXXXXXXXXX | MULT | — | — |
| 603-312 | DOVER | 6386 | — | — |
| 603-313 | KEENE | 6290 | — | Yes |
| 603-314 | MANCHESTER | 829J | — | Yes |
| 603-315 | MANCHESTER | 6386 | — | — |
| 603-316 | MILFORD | 6386 | 2017-10-16 | Yes |
| 603-317 | MILAN | 7778 | — | Yes |
| 603-318 | NASHUA | 6386 | — | Yes |
| 603-319 | PORTSMOUTH | 829J | — | Yes |
| 603-320 | NASHUA | 4036 | — | Yes |
| 603-321 | NASHUA | 6386 | — | — |
| 603-322 | W LEBANON | 4036 | — | Yes |
| 603-323 | TAMWORTH | 5113 | — | Yes |
| 603-324 | NASHUA | 7229 | — | Yes |
| 603-325 | NEW BOSTON | 7778 | — | Yes |
| 603-326 | BERLIN | 4017 | — | Yes |
| 603-327 | SALEM | 829J | — | Yes |
| 603-328 | SALEM | 829J | — | Yes |
| 603-329 | HAMPSTEAD | 5113 | — | Yes |
| 603-330 | ROCHESTER | 5113 | — | — |
| 603-331 | COLEBROOK | 4017 | — | Yes |
| 603-332 | ROCHESTER | 5113 | — | — |
| 603-333 | CONCORD | 927H | — | Yes |
| 603-334 | PORTSMOUTH | 5113 | — | Yes |
| 603-335 | ROCHESTER | 5113 | — | — |
| 603-336 | HINSDALE | 5113 | — | Yes |
| 603-337 | ROCHESTER | 5113 | — | Yes |
| 603-338 | KEENE | 7778 | — | Yes |
| 603-339 | DERRY | 4036 | — | Yes |
| 603-340 | SUNCOOK | 6386 | 2001-02-12 | Yes |
| 603-341 | MERRIMACK | 6290 | — | Yes |
| 603-342 | BERLIN | 5113 | — | Yes |
| 603-343 | DOVER | 318J | — | Yes |
| 603-344 | SUNCOOK | 6290 | — | Yes |
| 603-345 | MERRIMACK | 6290 | — | Yes |
| 603-346 | PLYMOUTH | 321J | — | Yes |
| 603-347 | KINGSTON | 318J | — | Yes |
| 603-348 | NOWOODSTOK | 6290 | — | Yes |
| 603-349 | W LEBANON | 6290 | — | Yes |
| 603-350 | MILTON | 7778 | — | Yes |
| 603-351 | GOFFSTOWN | 7778 | — | Yes |
| 603-352 | KEENE | 5113 | — | — |
| 603-353 | ORFORD | 5113 | — | Yes |
| 603-354 | KEENE | 5113 | — | Yes |
| 603-355 | KEENE | 5113 | — | Yes |
| 603-356 | NO CONWAY | 5113 | — | Yes |
| 603-357 | KEENE | 383J | — | Yes |
| 603-358 | KEENE | 5113 | — | — |
| 603-359 | LEBANON | 6386 | — | — |
| 603-360 | ORFORD | 573F | 2010-06-11 | Yes |
| 603-361 | MANCHESTER | 6386 | 2001-05-18 | Yes |
| 603-362 | HAMPSTEAD | 5113 | — | Yes |
| 603-363 | SPOFFORD | 5113 | — | Yes |
| 603-364 | GLNTNIRWRS | 0049 | — | Yes |
| 603-365 | MERRIMACK | 6889 | 2001-05-04 | Yes |
| 603-366 | LACONIA | 5113 | — | Yes |
| 603-367 | MADISON | 5113 | — | Yes |
| 603-368 | PORTSMOUTH | 8299 | 2017-12-27 | Yes |
| 603-369 | CONCORD | 4017 | — | Yes |
| 603-370 | CANDIA | 6386 | 2001-10-17 | Yes |
| 603-371 | PETERBROGH | 829J | — | Yes |
| 603-372 | CLAREMONT | 8468 | — | Yes |
| 603-373 | PORTSMOUTH | 829J | — | Yes |
| 603-374 | BARTLETT | 5113 | — | Yes |
| 603-375 | ASHLAND | 793K | 2012-07-19 | Yes |
| 603-376 | DOVER | 9748 | — | — |
| 603-377 | MERRIMACK | 6889 | — | Yes |
| 603-378 | PLAISTOW | 5113 | — | Yes |
| 603-379 | RYE BEACH | 4017 | — | Yes |
| 603-380 | PORTSMOUTH | 4036 | — | Yes |
| 603-381 | W LEBANON | 6290 | — | Yes |
| 603-382 | PLAISTOW | 5113 | — | — |
| 603-383 | JACKSON | 5113 | — | Yes |
| 603-384 | GOFFSTOWN | 318J | — | Yes |
| 603-385 | MANCHESTER | 5113 | — | — |
| 603-386 | SALEM | 829J | — | Yes |
| 603-387 | LACONIA | 6386 | — | — |
| 603-388 | COLEBROOK | 8468 | — | Yes |
| 603-389 | DURHAM | 829J | — | Yes |
| 603-390 | JEFFERSON | 7778 | — | Yes |
| 603-391 | MANCHESTER | 8299 | — | Yes |
| 603-392 | WINCHESTER | 318J | 2006-11-07 | Yes |
| 603-393 | LACONIA | 6290 | 2001-05-04 | Yes |
| 603-394 | SO HAMPTON | 5113 | — | Yes |
| 603-395 | EXETER | 7778 | — | Yes |
| 603-396 | MERRIMACK | 6889 | — | Yes |
| 603-397 | DURHAM | 318J | — | Yes |
| 603-398 | W LEBANON | 6290 | — | Yes |
| 603-399 | WESTMORELD | 5113 | — | 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.