| Area Code 303 Details | |
|---|---|
| Country | United States |
| State/Province | Colorado |
| Major City | Denver |
| Time Zone | Mountain (UTC-07:00) |
| Prefix | County | Phone Type | Status |
|---|---|---|---|
| 303-769 | Arapahoe | Landline | Active |
| 303-770 | Denver | Landline | Active |
| 303-771 | Denver | Landline | Active |
| 303-772 | Boulder | Landline | Active |
| 303-773 | Denver | Landline | Active |
| 303-774 | Boulder | Landline | Active |
| 303-775 | Boulder | Cell Number | Active |
| 303-776 | Boulder | Landline | Active |
| 303-777 | Denver | Landline | Active |
| 303-778 | Denver | Landline | Active |
| 303-779 | Denver | Landline | Active |
| 303-780 | Denver | Landline | Active |
| 303-781 | Denver | Landline | Active |
| 303-782 | Denver | Landline | Active |
| 303-783 | Denver | Landline | Active |
| 303-784 | Jefferson | Landline | Active |
| 303-785 | Arapahoe | Landline | Active |
| 303-786 | Jefferson | Landline | Active |
| 303-787 | Denver | Landline | Active |
| 303-788 | Denver | Landline | Active |