| 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 |
|---|---|---|---|
| 303-613 | Denver | Denver | Wireless |
| 303-916 | Denver | Denver | Wireless |
| 303-676 | Denver | Denver | Landline |
| 303-472 | Denver | Denver | Wireless |
| 303-968 | Denver | Denver | Landline |
| 303-779 | Denver | Denver | Landline |
| 303-460 | Denver | Adams | Landline |
| 303-979 | Littleton | Jefferson | Landline |
| 303-331 | Denver | Denver | Landline |
| 303-672 | Denver | Denver | Landline |
| 303-924 | Denver | Denver | Landline |
| 303-259 | Denver | Denver | Wireless |
| 303-525 | Denver | Denver | Wireless |
| 303-984 | Denver | Jefferson | Landline |
| 303-406 | Denver | Denver | Landline |
| 303-576 | Aurora | Arapahoe | Landline |
| 303-815 | Denver | Denver | Landline |
| 303-424 | Denver | Denver | Landline |
| 303-829 | Denver | Denver | Wireless |
| 303-224 | Denver | Denver | Landline |