All assignees
768 prefixes in 603 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 603-910 | HAMPTON | 829J | — | Yes |
| 603-911 | XXXXXXXXXX | MULT | — | — |
| 603-912 | SALEM | 145J | — | Yes |
| 603-913 | MERRIMACK | 829J | — | Yes |
| 603-915 | GORHAM | 6386 | 2002-02-22 | Yes |
| 603-916 | MEREDITH | 6889 | 2024-01-23 | Yes |
| 603-918 | HAMPTON | 6386 | 2002-04-19 | Yes |
| 603-919 | ROCHESTER | 6386 | 2023-07-05 | Yes |
| 603-921 | NASHUA | 6386 | 2009-07-06 | Yes |
| 603-922 | NO STRATFD | 5113 | — | Yes |
| 603-923 | ROCHESTER | 4017 | — | Yes |
| 603-924 | PETERBROGH | 5113 | — | — |
| 603-925 | PETERBROGH | 8468 | — | Yes |
| 603-926 | HAMPTON | 5113 | — | — |
| 603-927 | SUTTON | 0047 | — | Yes |
| 603-928 | SUNCOOK | 8468 | — | Yes |
| 603-929 | HAMPTON | 5113 | — | — |
| 603-930 | NASHUA | 4036 | — | — |
| 603-931 | CONCORD | 7778 | 2015-05-21 | Yes |
| 603-932 | MANCHESTER | 637E | — | Yes |
| 603-933 | GREENFIELD | 6386 | 2008-07-07 | Yes |
| 603-934 | FRANKLIN | 5113 | — | — |
| 603-935 | MANCHESTER | 318J | — | Yes |
| 603-937 | MEREDITH | 6386 | 2008-06-06 | Yes |
| 603-938 | BRADFORD | 0047 | — | Yes |
| 603-939 | EASTCONWAY | 3316 | — | Yes |
| 603-941 | WOLFEBORO | 7778 | — | Yes |
| 603-942 | NORTHWOOD | 5113 | — | Yes |
| 603-943 | NASHUA | 6889 | — | Yes |
| 603-944 | SO HAMPTON | 5562 | 2001-12-19 | Yes |
| 603-945 | MANCHESTER | 637E | 2007-08-01 | Yes |
| 603-947 | PLYMOUTH | 8468 | — | Yes |
| 603-948 | ROCHESTER | 314C | 2008-02-26 | Yes |
| 603-950 | — | — | ||
| 603-951 | MILAN | 4017 | — | Yes |
| 603-952 | SALEM | 4017 | — | Yes |
| 603-953 | DOVER | 829J | — | Yes |
| 603-956 | PORTSMOUTH | 197D | 2022-07-21 | Yes |
| 603-957 | PORTSMOUTH | 4036 | 2002-01-22 | Yes |
| 603-958 | — | — | ||
| 603-959 | — | — | ||
| 603-960 | CAMPTON | 6386 | 2008-01-22 | Yes |
| 603-961 | CHICHESTER | 318J | 2009-11-17 | Yes |
| 603-964 | RYE BEACH | 5113 | — | Yes |
| 603-965 | DERRY | 829J | — | Yes |
| 603-966 | NASHUA | 6889 | 2002-02-22 | Yes |
| 603-967 | HAMPTON | 4017 | — | Yes |
| 603-968 | ASHLAND | 5113 | — | Yes |
| 603-969 | PORTSMOUTH | 6889 | 2002-05-20 | Yes |
| 603-970 | DOVER | 4036 | 2006-03-22 | Yes |
| 603-971 | RINDGE | 8468 | — | Yes |
| 603-973 | ROCHESTER | 5562 | 2002-05-20 | Yes |
| 603-974 | PLAISTOW | 318J | — | Yes |
| 603-975 | BOSCAWEN | 318J | 2009-11-16 | Yes |
| 603-976 | — | — | ||
| 603-977 | ANDOVER | 318J | 2009-11-17 | Yes |
| 603-978 | DOVER | 4036 | 2001-03-16 | Yes |
| 603-986 | NO CONWAY | 6386 | 2002-04-19 | Yes |
| 603-988 | PORTSMOUTH | 6889 | 2001-10-17 | Yes |
| 603-989 | PIKE | 5113 | — | Yes |
| 603-991 | LITTLETON | 6386 | 2002-02-22 | Yes |
| 603-992 | DANBURY | 4017 | — | Yes |
| 603-994 | ROCHESTER | 8468 | — | — |
| 603-995 | HENNIKER | 6889 | 2002-08-09 | Yes |
| 603-996 | PLYMOUTH | 5562 | 2002-08-09 | Yes |
| 603-997 | HAMPTON | 5562 | 2002-08-09 | Yes |
| 603-998 | LACONIA | 5562 | 2002-07-08 | Yes |
| 603-999 | SALEM | 965H | 2019-12-09 | 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.