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
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
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.