| 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 |
|---|---|---|---|
| 603-324 | Nashua | Hillsborough | Landline |
| 603-230 | Concord | Merrimack | Landline |
| 603-561 | Nashua | Hillsborough | Wireless |
| 603-232 | Manchester | Hillsborough | Landline |
| 603-685 | Salem | Rockingham | Landline |
| 603-431 | Portsmouth | Rockingham | Landline |
| 603-606 | Manchester | Hillsborough | Landline |
| 603-302 | Manchester | Hillsborough | Wireless |
| 603-932 | Manchester | Hillsborough | Landline |
| 603-930 | Nashua | Hillsborough | Wireless |
| 603-623 | Manchester | Hillsborough | Landline |
| 603-574 | Alstead | Cheshire | Landline |
| 603-487 | New Boston | Hillsborough | Landline |
| 603-721 | Milford | Hillsborough | Wireless |
| 603-639 | Manchester | Hillsborough | Wireless |
| 603-863 | Newport | Sullivan | Landline |
| 603-624 | Manchester | Hillsborough | Landline |
| 603-767 | Dover | Strafford | Wireless |
| 603-874 | Bath | Grafton | Landline |
| 603-238 | Plymouth | Grafton | Landline |