Area codes in San Mateo, California
San Mateo, California uses area code 650. The main San Mateo area code is 650.
Area codes serving San Mateo
Phone numbers in San Mateo are written as ten digits — for example (650) 555-0190 — and fall in the Pacific Time zone.
All California area codes · Is a San Mateo call a scam?
Nearby cities
- Redwood City area codes
- Daly City area codes
- Palo Alto area codes
- San Leandro area codes
- Hayward area codes
- Alameda area codes
- Union City area codes
- San Francisco area codes
More cities in California
- Los Angeles area codes
- San Diego area codes
- Sacramento area codes
- San Jose area codes
- Fresno area codes
- Long Beach area codes
- Oakland area codes
- Bakersfield area codes
Frequently asked questions
What is the area code for San Mateo?
The main area code for San Mateo, California is 650.
How many area codes does San Mateo have?
San Mateo has 1 area code: 650.
How do you dial a San Mateo number?
Dial all 10 digits — the area code (650) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.