Area Code Lookup
What Area Code Is San Mateo?
Area code 650 · California
San Mateo uses area code 650. It is located in California.
Area Code Serving San Mateo
Frequently Asked Questions
What area code is San Mateo?
San Mateo uses area code 650. It is located in California.
How do I call San Mateo from outside the US?
To call San Mateo from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-650-XXX-XXXX). The +1 is the country code for all NANPA countries.