Search numbers reported to the U.S. Federal Commissions beginning with area code 603
Area code 603 belongs to NEW HAMPSHIRE, UNITED STATES. It is a General Purpose Code which was placed in service on 1947-01-01.
| Type | General Purpose Code |
| Use | Geograpic |
| Location | NEW HAMPSHIRE |
| Country | UNITED STATES |
| Service Date | 1947-01-01 |
| Service |