There are 756 phone number prefixes within area code 603. Additionally, there are more than 4,100 phone numbers in this area code that have received at least one user report. The location of calls from area code 603 is New Hampshire, USA. Most numbers in this area code are in US Eastern time, where the time is currently 4:33:37 PM on June 30, 2025.
Choose a phone number from the list below to browse user reports for . You can also use the search box above to search for user reports about any phone number, or to file a report about any phone number.
| Prefix | City / State | Primary Telco |
|---|---|---|
| 603-925 | Peterborough, NH | Freedom Ring Communications, Llc |
| 603-926 | Hampton, NH | Consolidated Comm Of No. New England-nh |
| 603-927 | Sutton, NH | Merrimack County Tel. Co. |
| 603-928 | Suncook, NH | Freedom Ring Communications, Llc |
| 603-929 | Hampton, NH | Consolidated Comm Of No. New England-nh |
| 603-930 | Nashua, NH | New Cingular Wireless Pcs, Llc - Dc |
| 603-931 | Concord, NH | Mcimetro Access Transmission Services Llc - Nh |
| 603-932 | Manchester, NH | Onvoy, Llc - Nh |
| 603-933 | Greenfield, NH | Bell Atlantic Mobile, Inc |
| 603-934 | Franklin, NH | Consolidated Comm Of No. New England-nh |
| 603-935 | Manchester, NH | Dsci, Llc |
| 603-937 | Meredith, NH | Bell Atlantic Mobile, Inc |
| 603-938 | Bradford, NH | Merrimack County Tel. Co. |
| 603-939 | East Conway, NH | Consolidated Communications Of Maine Company |
| 603-941 | Wolfeboro, NH | Mcimetro Access Transmission Services Llc - Nh |
| 603-942 | Northwood, NH | Consolidated Comm Of No. New England-nh |
| 603-943 | Nashua, NH | Omnipoint Miami E License, Llc |
| 603-944 | South Hampton, NH | Sprint Spectrum, L.p. |
| 603-945 | Manchester, NH | Onvoy, Llc - Nh |
| 603-946 | New Hampshire | |
| 603-947 | Plymouth, NH | Freedom Ring Communications, Llc |
| 603-948 | Rochester, NH | Idt America, Corp. - Nh |
| 603-950 | New Hampshire | |
| 603-951 | Milan, NH | Level 3 Communications, Llc - Nh |
| 603-952 | Salem, NH | Level 3 Communications, Llc - Nh |
| 603-953 | Dover, NH | Choice One Of New Hampshire, Inc. |
| 603-957 | Portsmouth, NH | New Cingular Wireless Pcs, Llc - Dc |
| 603-958 | New Hampshire | |
| 603-959 | New Hampshire | |
| 603-960 | Campton, NH | Bell Atlantic Mobile, Inc |
| 603-961 | Chichester, NH | Comcast Ip Phone, Llc |
| 603-964 | Rye Beach, NH | Consolidated Comm Of No. New England-nh |
| 603-965 | Derry, NH | Choice One Of New Hampshire, Inc. |
| 603-966 | Nashua, NH | Sprint Spectrum, L.p. |
| 603-967 | Hampton, NH | Level 3 Communications, Llc - Nh |
| 603-968 | Ashland, NH | Consolidated Comm Of No. New England-nh |
| 603-969 | Portsmouth, NH | Sprint Spectrum, L.p. |
| 603-970 | Dover, NH | New Cingular Wireless Pcs, Llc - Dc |
| 603-971 | Rindge, NH | Freedom Ring Communications, Llc |
| 603-973 | Rochester, NH | Sprint Spectrum, L.p. |
| 603-974 | Plaistow, NH | Comcast Ip Phone, Llc |
| 603-975 | Boscawen, NH | Comcast Ip Phone, Llc |
| 603-976 | New Hampshire | |
| 603-977 | Andover, NH | Comcast Ip Phone, Llc |
| 603-978 | Dover, NH | New Cingular Wireless Pcs, Llc - Dc |
| 603-986 | North Conway, NH | Bell Atlantic Mobile, Inc |
| 603-988 | Portsmouth, NH | Sprint Spectrum, L.p. |
| 603-989 | Pike, NH | Consolidated Comm Of No. New England-nh |
| 603-991 | Littleton, NH | Bell Atlantic Mobile, Inc |
| 603-992 | Danbury, NH | Level 3 Communications, Llc - Nh |
| 603-994 | Rochester, NH | Freedom Ring Communications, Llc |
| 603-995 | Henniker, NH | Sprint Spectrum, L.p. |
| 603-996 | Plymouth, NH | Sprint Spectrum, L.p. |
| 603-997 | Hampton, NH | Sprint Spectrum, L.p. |
| 603-998 | Laconia, NH | Sprint Spectrum, L.p. |
| 603-999 | Salem, NH | Fractel, Llc |
June 30, 2025