| 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 |
|---|---|---|---|
| 603-248 | Dover | Strafford | Wireless |
| 603-388 | Colebrook | Coos | Landline |
| 603-969 | Portsmouth | Rockingham | Wireless |
| 603-385 | Manchester | Hillsborough | Wireless |
| 603-796 | Concord | Merrimack | Landline |
| 603-237 | Colebrook | Coos | Landline |
| 603-391 | Manchester | Hillsborough | Landline |
| 603-886 | Nashua | Hillsborough | Landline |
| 603-843 | Newport | Sullivan | Landline |
| 603-730 | Intervale | Carroll | Landline |
| 603-365 | Merrimack | Hillsborough | Wireless |
| 603-496 | Concord | Merrimack | Wireless |
| 603-725 | Tamworth | Carroll | Landline |
| 603-964 | North Hampton | Rockingham | Landline |
| 603-952 | Salem | Rockingham | Landline |
| 603-354 | Keene | Cheshire | Landline |
| 603-267 | Belmont | Belknap | Landline |
| 603-330 | Rochester | Strafford | Landline |
| 603-812 | Portsmouth | Rockingham | Landline |
| 603-723 | Berlin | Coos | Wireless |