Area codes in Redwood City, California
Redwood City, California uses area code 650. The main Redwood City area code is 650.
Area codes serving Redwood City
Phone numbers in Redwood City are written as ten digits — for example (650) 555-0190 — and fall in the Pacific Time zone.
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Nearby cities
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More cities in California
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- Fresno area codes
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Frequently asked questions
What is the area code for Redwood City?
The main area code for Redwood City, California is 650.
How many area codes does Redwood City have?
Redwood City has 1 area code: 650.
How do you dial a Redwood City 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.