| 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 |
|---|---|---|---|
| 603-413 | Manchester | Hillsborough | Landline |
| 603-819 | Plaistow | Rockingham | Landline |
| 603-625 | Manchester | Hillsborough | Landline |
| 603-390 | Jefferson | Coos | Landline |
| 603-505 | Derry | Rockingham | Wireless |
| 603-277 | Hanover | Grafton | Landline |
| 603-526 | New London | Merrimack | Landline |
| 603-885 | Nashua | Hillsborough | Landline |
| 603-582 | Merrimack | Hillsborough | Wireless |
| 603-309 | Newport | Sullivan | Wireless |
| 603-565 | Concord | Merrimack | Landline |
| 603-266 | Tilton | Belknap | Landline |
| 603-522 | Sanbornville | Carroll | Landline |
| 603-897 | Nashua | Hillsborough | Landline |
| 603-866 | Dover | Strafford | Wireless |
| 603-349 | West Lebanon | Grafton | Wireless |
| 603-732 | Nashua | Hillsborough | Landline |
| 603-690 | Claremont | Sullivan | Landline |
| 603-859 | New Durham | Strafford | Landline |
| 603-791 | Nashua | Hillsborough | Landline |