| 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 |
|---|---|---|---|
| 603-395 | Exeter | Rockingham | Landline |
| 603-281 | Nashua | Hillsborough | Wireless |
| 603-280 | Barrington | Strafford | Landline |
| 603-531 | Portsmouth | Rockingham | Wireless |
| 603-675 | Plainfield | Sullivan | Landline |
| 603-356 | North Conway | Carroll | Landline |
| 603-304 | Enfield | Grafton | Wireless |
| 603-212 | Salem | Rockingham | Landline |
| 603-777 | Exeter | Rockingham | Landline |
| 603-827 | Harrisville | Cheshire | Landline |
| 603-903 | Keene | Cheshire | Landline |
| 603-789 | Andover | Merrimack | Landline |
| 603-504 | Claremont | Sullivan | Wireless |
| 603-841 | Somersworth | Strafford | Landline |
| 603-906 | Rochester | Strafford | Landline |
| 603-547 | Greenfield | Hillsborough | Landline |
| 603-870 | Salem | Rockingham | Landline |
| 603-593 | Jaffrey | Cheshire | Landline |
| 603-571 | Derry | Rockingham | Wireless |
| 603-823 | Franconia | Grafton | Landline |