| General Information for Area Code 303 | |
|---|---|
| Country | United States |
| State/Province | Colorado |
| Major City | Denver |
| Time Zone | Mountain (UTC-07:00) |
| Prefix | Primary City | County | Phone Type |
|---|---|---|---|
| 303-305 | Denver | Denver | Landline |
| 303-307 | Denver | Denver | Landline |
| 303-308 | Denver | Denver | Landline |
| 303-310 | Denver | Jefferson | Cell Number |
| 303-312 | Denver | Denver | Landline |
| 303-313 | Denver | Denver | Landline |
| 303-314 | Denver | Denver | Landline |
| 303-315 | Denver | Denver | Landline |
| 303-316 | Denver | Jefferson | Landline |
| 303-317 | Aurora | Adams | Landline |
| 303-318 | Denver | Denver | Landline |
| 303-319 | Denver | Jefferson | Cell Number |
| 303-320 | Denver | Denver | Landline |
| 303-321 | Denver | Denver | Landline |
| 303-322 | Denver | Denver | Landline |
| 303-323 | Denver | Denver | Landline |
| 303-324 | Denver | Jefferson | Cell Number |
| 303-325 | Denver | Denver | Landline |
| 303-326 | Aurora | Arapahoe | Landline |
| 303-327 | Denver | Denver | Landline |