| 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 |
|---|---|---|---|
| 603-714 | Manchester | Hillsborough | Wireless |
| 603-292 | Newmarket | Rockingham | Landline |
| 603-630 | Gilford | Belknap | Wireless |
| 603-836 | Manchester | Hillsborough | Landline |
| 603-568 | Concord | Merrimack | Wireless |
| 603-763 | Sunapee | Sullivan | Landline |
| 603-336 | Hinsdale | Cheshire | Landline |
| 603-746 | Contoocook | Merrimack | Landline |
| 603-229 | Concord | Merrimack | Landline |
| 603-822 | Rochester | Strafford | Landline |
| 603-875 | Alton | Belknap | Landline |
| 603-517 | Merrimack | Hillsborough | Wireless |
| 603-222 | Manchester | Hillsborough | Landline |
| 603-926 | Hampton | Rockingham | Landline |
| 603-542 | Claremont | Sullivan | Landline |
| 603-412 | Plymouth | Grafton | Wireless |
| 603-884 | Nashua | Hillsborough | Landline |
| 603-684 | Lancaster | Coos | Landline |
| 603-225 | Concord | Merrimack | Landline |
| 603-283 | Keene | Cheshire | Landline |