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40 prefixes in 603 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 603-200 | NEWMARKET | 318J | 2011-08-16 | Yes |
| 603-210 | SUNCOOK | 318J | — | Yes |
| 603-213 | MILFORD | 318J | 2012-11-08 | Yes |
| 603-216 | DERRY | 318J | — | Yes |
| 603-232 | MANCHESTER | 318J | — | Yes |
| 603-244 | RAYMOND | 318J | — | Yes |
| 603-260 | DERRY | 318J | 2013-01-04 | Yes |
| 603-277 | HANOVER | 318J | 2006-10-13 | Yes |
| 603-291 | GREENVILLE | 318J | 2006-10-26 | Yes |
| 603-292 | NEWMARKET | 318J | — | Yes |
| 603-343 | DOVER | 318J | — | Yes |
| 603-347 | KINGSTON | 318J | — | Yes |
| 603-384 | GOFFSTOWN | 318J | — | Yes |
| 603-392 | WINCHESTER | 318J | 2006-11-07 | Yes |
| 603-397 | DURHAM | 318J | — | Yes |
| 603-403 | ROCHESTER | 318J | 2018-07-31 | Yes |
| 603-441 | ROCHESTER | 318J | 2021-09-09 | Yes |
| 603-458 | SALEM | 318J | — | Yes |
| 603-488 | BEDFORD | 318J | — | Yes |
| 603-489 | HAMPSTEAD | 318J | — | Yes |
| 603-510 | MERIDEN | 318J | 2010-03-29 | Yes |
| 603-580 | EXETER | 318J | — | Yes |
| 603-619 | LACONIA | 318J | 2022-09-01 | Yes |
| 603-649 | JAFFREY | 318J | 2022-09-29 | Yes |
| 603-697 | DOVER | 318J | 2022-10-06 | Yes |
| 603-705 | SALISBURY | 318J | 2009-11-17 | Yes |
| 603-708 | CANTERBURY | 318J | 2005-02-18 | Yes |
| 603-715 | CONCORD | 318J | — | Yes |
| 603-808 | ANTRIM | 318J | 2009-11-23 | Yes |
| 603-814 | SEABROOK | 318J | 2010-07-30 | Yes |
| 603-836 | MANCHESTER | 318J | 2002-05-20 | Yes |
| 603-840 | EPSOM | 318J | 2009-11-16 | Yes |
| 603-841 | SOMERSWTH | 318J | — | Yes |
| 603-877 | NEW LONDON | 318J | 2009-11-17 | Yes |
| 603-902 | SUTTON | 318J | 2009-11-17 | Yes |
| 603-935 | MANCHESTER | 318J | — | Yes |
| 603-961 | CHICHESTER | 318J | 2009-11-17 | Yes |
| 603-974 | PLAISTOW | 318J | — | Yes |
| 603-975 | BOSCAWEN | 318J | 2009-11-16 | Yes |
| 603-977 | ANDOVER | 318J | 2009-11-17 | 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.