| 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 |
|---|---|---|---|
| 303-600 | Denver | Denver | Landline |
| 303-920 | Denver | Adams | Landline |
| 303-265 | Denver | Denver | Landline |
| 303-695 | Denver | Denver | Landline |
| 303-490 | Denver | Denver | Wireless |
| 303-571 | Denver | Denver | Landline |
| 303-930 | Denver | Denver | Landline |
| 303-644 | Bennett | Adams | Landline |
| 303-607 | Denver | Denver | Landline |
| 303-813 | Denver | Denver | Landline |
| 303-499 | Denver | Denver | Landline |
| 303-326 | Denver | Denver | Landline |
| 303-413 | Denver | Denver | Landline |
| 303-481 | Denver | Denver | Landline |
| 303-407 | Denver | Denver | Landline |
| 303-651 | Longmont | Boulder | Landline |
| 303-974 | Denver | Denver | Landline |
| 303-754 | Denver | Denver | Landline |
| 303-691 | Denver | Denver | Landline |
| 303-962 | Denver | Denver | Landline |