Sunnyvale City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 408 | US | California - CA | Sunnyvale | Pacific | Details |
| 510 | US | California - CA | Sunnyvale | Pacific | Details |
| 650 | US | California - CA | Sunnyvale | Pacific | Details |
| 669 | US | California - CA | Sunnyvale | Pacific | Details |
| 831 | US | California - CA | Sunnyvale | Pacific | Details |
| 972 | US | Texas - TX | Sunnyvale | Central | Details |