| 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 |
|---|---|---|---|
| 603-387 | Gilford | Belknap | Wireless |
| 603-298 | West Lebanon | Grafton | Landline |
| 603-488 | Manchester | Hillsborough | Landline |
| 603-840 | Epsom | Merrimack | Landline |
| 603-773 | Exeter | Rockingham | Landline |
| 603-848 | Concord | Merrimack | Wireless |
| 603-560 | Salem | Rockingham | Wireless |
| 603-868 | Durham | Strafford | Landline |
| 603-213 | Derry | Rockingham | Wireless |
| 603-279 | Meredith | Belknap | Landline |
| 603-257 | Plaistow | Rockingham | Landline |
| 603-998 | Gilford | Belknap | Wireless |
| 603-470 | Concord | Merrimack | Wireless |
| 603-960 | Thornton | Grafton | Wireless |
| 603-945 | Manchester | Hillsborough | Landline |
| 603-351 | Manchester | Hillsborough | Landline |
| 603-251 | Salem | Rockingham | Landline |
| 603-931 | Concord | Merrimack | Landline |
| 603-345 | Merrimack | Hillsborough | Wireless |
| 603-853 | Woodsville | Grafton | Landline |