CALIFORNIA · AREA CODE GUIDE
650 area code location: San Mateo and Redwood City, California
- Local date and time
- Pacific Time
Map data: UCLA Geoportal (2015) · NANPA · US Census Bureau, checked 26 September 2026. Boundaries are approximate.
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Download the 650 area code map
650 area code at a glance
- State
- California
- Primary cities
- San Mateo, Redwood City, and Palo Alto
- Established
- Time zone
- Pacific Time
- Parent code
- 415
- New code planned
- No, as of 22 September 2026
- Answering calls
- Rules for answering calls in California
An area code does not show where a caller is now.
Counties and cities covered
These are telephone exchange areas, which follow the phone network rather than city limits.
Counties of the communities we could place (the code may reach further): San Mateo County and Santa Clara County.
- San Mateo
- Redwood City
- Palo Alto
- South San Francisco
- Pacifica
- Los Altos
- Millbrae
- Half Moon Bay
- Woodside
- Juniper
- La Honda
- Moss Beach
- Mountain View
- Pescadero
- San Carlos-Belmont
Sources: NANPA area code listing, NANPA places by area code, U.S. Census Bureau county geography. Checked .
Business phone numbers in area code 650, answered by an AI agent
A local number for San Mateo, Redwood City, and Palo Alto, California, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.