Area Code Lookup
What Area Code Is Sunnyvale?
2 area codes serve Sunnyvale · California
Sunnyvale is served by area codes 408, 669. It is located in California.
Area Codes Serving Sunnyvale
Frequently Asked Questions
What area code is Sunnyvale?
Sunnyvale is served by area codes 408, 669. It is located in California.
Why does Sunnyvale have multiple area codes?
As demand for phone numbers increased, NANPA added area codes through splits (dividing the region) or overlays (layering a new code over the same geography). Sunnyvale now has 2 area codes — 408 and 669 — covering the same or overlapping areas.
How do I call Sunnyvale from outside the US?
To call Sunnyvale from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-408-XXX-XXXX). The +1 is the country code for all NANPA countries.