| 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 |
|---|---|---|---|
| 303-841 | Denver | Denver | Landline |
| 303-696 | Denver | Denver | Landline |
| 303-395 | Denver | Denver | Landline |
| 303-370 | Denver | Denver | Landline |
| 303-922 | Denver | Denver | Landline |
| 303-574 | Aurora | Arapahoe | Landline |
| 303-458 | Denver | Denver | Landline |
| 303-816 | Denver | Denver | Landline |
| 303-536 | Hudson | Weld | Landline |
| 303-218 | Denver | Denver | Landline |
| 303-833 | Denver | Denver | Landline |
| 303-749 | Denver | Denver | Landline |
| 303-774 | Longmont | Boulder | Landline |
| 303-262 | Denver | Denver | Landline |
| 303-343 | Denver | Denver | Landline |
| 303-505 | Denver | Denver | Wireless |
| 303-636 | Denver | Denver | Landline |
| 303-435 | Denver | Denver | Wireless |
| 303-871 | Denver | Denver | Landline |
| 303-514 | Denver | Denver | Wireless |