Area Code Lookup
What Area Code Is Fullerton?
2 area codes serve Fullerton · California
Fullerton is served by area codes 657, 714. It is located in California.
Area Codes Serving Fullerton
Frequently Asked Questions
What area code is Fullerton?
Fullerton is served by area codes 657, 714. It is located in California.
Why does Fullerton 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). Fullerton now has 2 area codes — 657 and 714 — covering the same or overlapping areas.
How do I call Fullerton from outside the US?
To call Fullerton from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-657-XXX-XXXX). The +1 is the country code for all NANPA countries.