Phone numbers in Claremont, New Hampshire
Claremont has 8 phone prefixes in area code 603.
Biggest holders: UScellular, Consolidated Comm Of No. New England-nh, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 38%
- Local phone company 25%
- Internet / business phone carrier 25%
- Phone company 12%
Every prefix in Claremont
Search the first six digits of a number in this list. If it's here, the number started in Claremont with the carrier shown. If it isn't, check the New Hampshire page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 603-287 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 603-372 | Freedom Ring Communications | Phone company | – |
| 603-477 | UScellular | Mobile carrier | – |
| 603-504 | UScellular | Mobile carrier | – |
| 603-542 | Consolidated Comm Of No. New England-nh | Local phone company | – |
| 603-543 | Consolidated Comm Of No. New England-nh | Local phone company | – |
| 603-558 | Bell Atlantic Mobile | Mobile carrier | – |
| 603-690 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.