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New Hampshire Area Codes
New Hampshire has 1 area code in service: 603.
Largest cities
| City | Area codes |
|---|---|
| Manchester | 603 |
| Nashua | 603 |
| Concord | 603 |
| Dover | 603 |
| Rochester | 603 |
| Keene | 603 |
| Portsmouth | 603 |
| Derry | 603 |
| Laconia | 603 |
| Lebanon | 603 |
| Claremont | 603 |
| Londonderry | 603 |
All area codes in New Hampshire
| Code | Main cities | Overlay | In service since | Projected exhaust |
|---|---|---|---|---|
| 603 | Manchester, Nashua, Concord, Dover | — | 1947 | 2040 |
752 prefixes are in use across New Hampshire. Exhaust years are NANPA's 2026 forecast.