| General Information about Area Code 303 | |
|---|---|
| Country | United States |
| State / Province / Territory | Colorado |
| Major City | Denver |
| Time Zone | Mountain (UTC-07:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 303-467 | Denver | Denver | Landline |
| 303-845 | Longmont | Boulder | Landline |
| 303-850 | Denver | Denver | Landline |
| 303-242 | Denver | Denver | Landline |
| 303-758 | Denver | Denver | Landline |
| 303-739 | Denver | Denver | Landline |
| 303-927 | Denver | Denver | Landline |
| 303-534 | Denver | Denver | Landline |
| 303-210 | Denver | Denver | Wireless |
| 303-668 | Denver | Denver | Wireless |
| 303-705 | Denver | Denver | Landline |
| 303-861 | Denver | Denver | Landline |
| 303-408 | Denver | Denver | Landline |
| 303-585 | Denver | Denver | Landline |
| 303-241 | Denver | Denver | Wireless |
| 303-320 | Denver | Denver | Landline |
| 303-659 | Brighton | Adams | Landline |
| 303-485 | Longmont | Boulder | Landline |
| 303-732 | Keenesburg | Weld | Landline |
| 303-901 | Denver | Denver | Wireless |