| 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 |
|---|---|---|---|
| 603-640 | Hanover | Grafton | Landline |
| 603-360 | Orford | Grafton | Landline |
| 603-215 | Berlin | Coos | Landline |
| 603-425 | Derry | Rockingham | Landline |
| 603-814 | Seabrook | Rockingham | Wireless |
| 603-272 | Warren | Grafton | Landline |
| 603-913 | Manchester | Hillsborough | Landline |
| 603-556 | Gilford | Belknap | Landline |
| 603-462 | Deerfield | Rockingham | Landline |
| 603-764 | Warren | Grafton | Landline |
| 603-376 | Dover | Strafford | Wireless |
| 603-497 | Goffstown | Hillsborough | Landline |
| 603-867 | Manchester | Hillsborough | Wireless |
| 603-935 | Manchester | Hillsborough | Landline |
| 603-588 | Antrim | Hillsborough | Landline |
| 603-799 | Manchester | Hillsborough | Wireless |
| 603-501 | Portsmouth | Rockingham | Landline |
| 603-210 | Manchester | Hillsborough | Landline |
| 603-278 | Whitefield | Coos | Landline |
| 603-444 | Littleton | Grafton | Landline |