All assignees
768 prefixes in 603 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 603-802 | CONCORD | 637E | 2022-09-13 | Yes |
| 603-803 | KEENE | 508J | 2016-10-20 | Yes |
| 603-804 | DOVER | 490J | 2023-08-31 | Yes |
| 603-805 | CONCORD | 7778 | 2023-10-17 | Yes |
| 603-808 | ANTRIM | 318J | 2009-11-23 | Yes |
| 603-809 | NASHUA | 6386 | 2007-03-13 | Yes |
| 603-810 | NASHUA | 073H | 2021-06-01 | Yes |
| 603-811 | XXXXXXXXXX | MULT | — | — |
| 603-812 | PORTSMOUTH | 6386 | — | Yes |
| 603-813 | CTRBARNSTE | 314C | 2009-10-30 | Yes |
| 603-814 | SEABROOK | 318J | 2010-07-30 | Yes |
| 603-815 | DURHAM | 8299 | 2007-12-06 | Yes |
| 603-816 | NASHUA | 8468 | — | Yes |
| 603-817 | DOVER | 6889 | 2001-12-19 | Yes |
| 603-818 | DERRY | 6889 | 2002-07-08 | Yes |
| 603-819 | PLAISTOW | 4017 | — | Yes |
| 603-820 | MERRIMACK | 5562 | 2008-03-10 | Yes |
| 603-821 | NASHUA | 829J | — | Yes |
| 603-822 | ROCHESTER | 829J | — | Yes |
| 603-823 | FRANCONIA | 5113 | — | Yes |
| 603-824 | SALEM | 7778 | — | Yes |
| 603-825 | MANCHESTER | 516J | 2022-01-13 | Yes |
| 603-826 | CHARLESTN | 5113 | — | Yes |
| 603-827 | HARRISVL | 5113 | — | Yes |
| 603-828 | PORTSMOUTH | 6386 | 2002-01-22 | Yes |
| 603-829 | SUNAPEE | 7778 | — | Yes |
| 603-831 | GREENFIELD | 6386 | 2004-12-14 | Yes |
| 603-832 | LACONIA | 829J | — | Yes |
| 603-833 | ROCHESTER | 6386 | 2004-10-05 | Yes |
| 603-834 | DOVER | 829J | — | Yes |
| 603-835 | ALSTEAD | 5113 | — | Yes |
| 603-836 | MANCHESTER | 318J | 2002-05-20 | Yes |
| 603-837 | WHITEFIELD | 5113 | — | Yes |
| 603-838 | LISBON | 5113 | — | Yes |
| 603-839 | FARMINGTON | 793K | — | Yes |
| 603-840 | EPSOM | 318J | 2009-11-16 | Yes |
| 603-841 | SOMERSWTH | 318J | — | Yes |
| 603-842 | DOVER | 829J | — | Yes |
| 603-843 | NEWPORT | 8468 | — | Yes |
| 603-845 | DERRY | 829J | — | Yes |
| 603-846 | TWIN MT | 5113 | — | Yes |
| 603-847 | SULLIVAN | 5113 | — | Yes |
| 603-848 | CONCORD | 6290 | — | Yes |
| 603-850 | LISBON | 4036 | 2021-09-20 | Yes |
| 603-851 | MANCHESTER | 6386 | — | Yes |
| 603-852 | KEENE | 6889 | — | Yes |
| 603-853 | WOODSVILLE | 8468 | — | Yes |
| 603-854 | MANCHESTER | 4036 | 2002-12-06 | Yes |
| 603-855 | ALTON | 314C | 2009-10-30 | Yes |
| 603-856 | CONCORD | 829J | — | Yes |
| 603-857 | SUNCOOK | 616J | 2022-04-21 | Yes |
| 603-858 | MANCHESTER | 6889 | — | Yes |
| 603-859 | NEW DURHAM | 0049 | — | Yes |
| 603-860 | MANCHESTER | 6386 | — | — |
| 603-861 | TAMWORTH | 7778 | — | Yes |
| 603-862 | DURHAM | 829J | 2001-04-26 | — |
| 603-863 | NEWPORT | 5113 | — | — |
| 603-864 | NASHUA | 5113 | — | Yes |
| 603-865 | NEWPORT | 5113 | — | Yes |
| 603-866 | DOVER | 6889 | — | Yes |
| 603-867 | MANCHESTER | 4036 | — | — |
| 603-868 | DURHAM | 5113 | — | — |
| 603-869 | BETHLEHEM | 5113 | — | Yes |
| 603-870 | SALEM | 5113 | — | — |
| 603-871 | SANBORNVL | 4017 | — | Yes |
| 603-872 | GLNTNIRWRS | 314C | 2009-10-30 | Yes |
| 603-873 | SUNAPEE | 4017 | — | Yes |
| 603-874 | MONROE | 4017 | — | Yes |
| 603-875 | ALTON | 0049 | — | Yes |
| 603-876 | MARLBOROGH | 5113 | — | Yes |
| 603-877 | NEW LONDON | 318J | 2009-11-17 | Yes |
| 603-878 | GREENVILLE | 5113 | — | Yes |
| 603-879 | NASHUA | 5113 | — | Yes |
| 603-880 | NASHUA | 073H | — | Yes |
| 603-881 | NASHUA | 5113 | — | Yes |
| 603-882 | NASHUA | 5113 | — | — |
| 603-883 | NASHUA | 5113 | — | — |
| 603-884 | NASHUA | 5113 | — | Yes |
| 603-885 | NASHUA | 5113 | — | — |
| 603-886 | NASHUA | 5113 | — | — |
| 603-887 | CHESTER | 0039 | — | — |
| 603-888 | NASHUA | 5113 | — | — |
| 603-889 | NASHUA | 5113 | — | — |
| 603-890 | SALEM | 5113 | — | — |
| 603-891 | NASHUA | 5113 | — | — |
| 603-892 | CONCORD | 6889 | — | Yes |
| 603-893 | SALEM | 5113 | — | — |
| 603-894 | SALEM | 5113 | — | — |
| 603-895 | RAYMOND | 5113 | — | Yes |
| 603-896 | SALEM | 5113 | — | Yes |
| 603-897 | NASHUA | 5113 | — | Yes |
| 603-898 | SALEM | 5113 | — | — |
| 603-899 | RINDGE | 5113 | — | Yes |
| 603-900 | NEWPORT | 965H | 2020-06-15 | Yes |
| 603-901 | CONWAY | 7778 | 2016-02-26 | Yes |
| 603-902 | SUTTON | 318J | 2009-11-17 | Yes |
| 603-903 | KEENE | 6386 | — | Yes |
| 603-904 | WALPOLE | 9827 | 2005-08-22 | Yes |
| 603-905 | BARRINGTON | 9827 | 2006-09-20 | Yes |
| 603-906 | BARNSTEAD | 314C | 2009-10-30 | 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.