Area Code Lookup
What Area Code Is Vallejo?
Area code 707 · California
Vallejo uses area code 707. It is located in California.
Area Code Serving Vallejo
Frequently Asked Questions
What area code is Vallejo?
Vallejo uses area code 707. It is located in California.
How do I call Vallejo from outside the US?
To call Vallejo from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-707-XXX-XXXX). The +1 is the country code for all NANPA countries.