| 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 |
|---|---|---|---|
| 603-871 | Sanbornville | Carroll | Landline |
| 603-260 | Derry | Rockingham | Wireless |
| 603-915 | Gorham | Coos | Wireless |
| 603-748 | Warner | Merrimack | Wireless |
| 603-641 | Manchester | Hillsborough | Landline |
| 603-682 | Manchester | Hillsborough | Wireless |
| 603-264 | Manchester | Hillsborough | Wireless |
| 603-549 | Derry | Rockingham | Wireless |
| 603-707 | Meredith | Belknap | Wireless |
| 603-669 | Manchester | Hillsborough | Landline |
| 603-513 | Concord | Merrimack | Landline |
| 603-996 | Plymouth | Grafton | Wireless |
| 603-904 | Walpole | Cheshire | Landline |
| 603-590 | Durham | Strafford | Landline |
| 603-629 | Manchester | Hillsborough | Landline |
| 603-756 | Alstead | Cheshire | Landline |
| 603-404 | Conway | Carroll | Wireless |
| 603-608 | Northwood | Rockingham | Wireless |
| 603-479 | Derry | Rockingham | Wireless |
| 603-943 | Nashua | Hillsborough | Wireless |