| General Information about Area Code 603 | |
|---|---|
| Country | United States |
| State / Province / Territory | New Hampshire |
| Major City | Manchester |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 603-546 | Nashua | Hillsborough | Landline |
| 603-424 | Merrimack | Hillsborough | Landline |
| 603-521 | Nashua | Hillsborough | Landline |
| 603-887 | Chester | Rockingham | Landline |
| 603-477 | Claremont | Sullivan | Wireless |
| 603-891 | Nashua | Hillsborough | Landline |
| 603-235 | Derry | Rockingham | Wireless |
| 603-865 | Newport | Sullivan | Landline |
| 603-539 | Center Ossipee | Carroll | Landline |
| 603-716 | Manchester | Hillsborough | Landline |
| 603-350 | Rochester | Strafford | Landline |
| 603-252 | West Lebanon | Grafton | Wireless |
| 603-438 | Nashua | Hillsborough | Wireless |
| 603-576 | Wentworth | Grafton | Landline |
| 603-516 | Dover | Strafford | Landline |
| 603-471 | Bedford | Hillsborough | Landline |
| 603-580 | Exeter | Rockingham | Landline |
| 603-893 | Salem | Rockingham | Landline |
| 603-657 | Manchester | Hillsborough | Landline |
| 603-236 | North Sandwich | Carroll | Landline |