Search numbers reported to the U.S. Federal Commissions beginning with area code 303
Area code 303 belongs to COLORADO, UNITED STATES. It is a General Purpose Code which was placed in service on 1947-01-01.
| Type | General Purpose Code |
| Use | Geograpic |
| Location | COLORADO |
| Country | UNITED STATES |
| Service Date | 1947-01-01 |
| Service |