All assignees
768 prefixes in 603 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 603-200 | NEWMARKET | 318J | 2011-08-16 | Yes |
| 603-201 | XXXXXXXXXX | 5113 | — | — |
| 603-202 | CONCORD | 6889 | 2023-01-13 | Yes |
| 603-203 | MANCHESTER | 4036 | 2003-05-14 | Yes |
| 603-204 | NASHUA | 6290 | — | Yes |
| 603-205 | PORTSMOUTH | 6889 | — | Yes |
| 603-206 | MANCHESTER | 829J | — | Yes |
| 603-207 | DERRY | 637E | 2022-09-13 | Yes |
| 603-208 | LYME | 6290 | — | Yes |
| 603-209 | KEENE | 6290 | — | Yes |
| 603-210 | SUNCOOK | 318J | — | Yes |
| 603-211 | XXXXXXXXXX | MULT | — | — |
| 603-212 | SALEM | 5113 | — | Yes |
| 603-213 | MILFORD | 318J | 2012-11-08 | Yes |
| 603-214 | ERROL | 8468 | — | Yes |
| 603-215 | BERLIN | 8468 | — | Yes |
| 603-216 | DERRY | 318J | — | Yes |
| 603-217 | BRISTOL | 6386 | 2001-07-11 | Yes |
| 603-218 | MANCHESTER | 829J | — | Yes |
| 603-219 | CONCORD | 6889 | 2001-02-14 | Yes |
| 603-220 | XXXXXXXXXX | — | — | |
| 603-221 | NASHUA | 5113 | — | — |
| 603-222 | MANCHESTER | 5113 | — | — |
| 603-223 | CONCORD | 5113 | — | Yes |
| 603-224 | CONCORD | 5113 | — | — |
| 603-225 | CONCORD | 5113 | — | — |
| 603-226 | CONCORD | 5113 | — | — |
| 603-227 | CONCORD | 5113 | — | Yes |
| 603-228 | CONCORD | 5113 | — | — |
| 603-229 | CONCORD | 5113 | — | Yes |
| 603-230 | CONCORD | 5113 | — | Yes |
| 603-231 | DERRY | 6889 | 2001-05-03 | Yes |
| 603-232 | MANCHESTER | 318J | — | Yes |
| 603-233 | NASHUA | 6889 | — | Yes |
| 603-234 | DERRY | 6889 | 2001-05-03 | Yes |
| 603-235 | DERRY | 6889 | 2001-05-03 | Yes |
| 603-236 | CAMPTON | 5113 | — | Yes |
| 603-237 | COLEBROOK | 5113 | — | Yes |
| 603-238 | PLYMOUTH | 829J | — | Yes |
| 603-239 | WINCHESTER | 5113 | — | Yes |
| 603-240 | MANCHESTER | 5113 | — | — |
| 603-241 | DOVER | 4036 | 2022-03-21 | Yes |
| 603-242 | TROY | 5113 | — | Yes |
| 603-243 | WOODSVILLE | 792K | 2011-07-20 | Yes |
| 603-244 | RAYMOND | 318J | — | Yes |
| 603-245 | PORTSMOUTH | 5113 | — | — |
| 603-246 | WSTEWATSTN | 5113 | — | Yes |
| 603-247 | DERRY | 4036 | — | Yes |
| 603-248 | DOVER | 5113 | — | — |
| 603-249 | MILFORD | 5113 | — | Yes |
| 603-250 | CENTER HBR | 8468 | — | Yes |
| 603-251 | CHARLESTN | 829J | 2012-02-28 | Yes |
| 603-252 | W LEBANON | 6290 | 2001-03-22 | Yes |
| 603-253 | CENTER HBR | 5113 | — | Yes |
| 603-254 | PLYMOUTH | 6290 | — | Yes |
| 603-255 | MANCHESTER | 425J | 2020-02-19 | Yes |
| 603-256 | WCHESTEFLD | 5113 | — | Yes |
| 603-257 | PLAISTOW | 8468 | — | Yes |
| 603-258 | HOLLIS | 5562 | 2017-04-14 | Yes |
| 603-259 | LITTLETON | 4017 | — | Yes |
| 603-260 | DERRY | 318J | 2013-01-04 | Yes |
| 603-261 | MERRIMACK | 6290 | — | Yes |
| 603-262 | MERRIMACK | 5113 | — | Yes |
| 603-263 | MANCHESTER | 927H | — | Yes |
| 603-264 | MANCHESTER | 6889 | — | Yes |
| 603-265 | NEW BOSTON | 6889 | — | Yes |
| 603-266 | TILTON | 5113 | — | Yes |
| 603-267 | BELMONT | 5113 | — | Yes |
| 603-268 | SUNCOOK | 5113 | — | Yes |
| 603-269 | CTRBARNSTE | 0049 | — | Yes |
| 603-270 | SUNCOOK | 7778 | — | Yes |
| 603-271 | CONCORD | 5113 | — | — |
| 603-272 | PIERMONT | 5113 | — | Yes |
| 603-273 | LACONIA | 7778 | — | Yes |
| 603-274 | SO HAMPTON | 7778 | — | Yes |
| 603-275 | DERRY | 6889 | — | Yes |
| 603-276 | W LEBANON | 6386 | — | Yes |
| 603-277 | HANOVER | 318J | 2006-10-13 | Yes |
| 603-278 | BRETTON WD | 0038 | — | — |
| 603-279 | MEREDITH | 5113 | — | — |
| 603-280 | BARRINGTON | 4017 | — | Yes |
| 603-281 | NASHUA | 5113 | — | Yes |
| 603-282 | CANAAN | 7778 | — | Yes |
| 603-283 | KEENE | 829J | — | Yes |
| 603-284 | CTRSANDWIH | 5113 | — | Yes |
| 603-285 | DOVER | 7778 | — | Yes |
| 603-286 | TILTON | 5113 | — | Yes |
| 603-287 | CLAREMONT | 4017 | — | Yes |
| 603-288 | NASHUA | 197D | 2017-07-05 | Yes |
| 603-289 | MANCHESTER | 4036 | — | — |
| 603-290 | CONCORD | 6290 | — | Yes |
| 603-291 | GREENVILLE | 318J | 2006-10-26 | Yes |
| 603-292 | NEWMARKET | 318J | — | Yes |
| 603-293 | LACONIA | 5113 | — | Yes |
| 603-294 | PORTSMOUTH | 4017 | — | Yes |
| 603-295 | DURHAM | 829J | 2001-04-26 | — |
| 603-296 | MANCHESTER | 829J | — | Yes |
| 603-297 | CTROSSIPEE | 8468 | — | Yes |
| 603-298 | W LEBANON | 5113 | — | Yes |
| 603-299 | BARTLETT | 4036 | 2017-07-28 | 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.