Area codes in Oakland, California
Oakland, California uses 2 area codes — 510 and 341. The main Oakland area code is 510.
Area codes serving Oakland
Phone numbers in Oakland are written as ten digits — for example (510) 555-0190 — and fall in the Pacific Time zone.
How Oakland came to have 2 area codes
The original Oakland area code is 510, in service since 1991. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 341 (2019). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Oakland now uses all 2 codes and every local call is dialed with ten digits.
All California area codes · Is a Oakland call a scam?
Nearby cities
- Alameda area codes
- San Leandro area codes
- Berkeley area codes
- Walnut Creek area codes
- Hayward area codes
- San Francisco area codes
- San Ramon area codes
- Daly City 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
- Bakersfield area codes
- Beverly Hills area codes
Frequently asked questions
What is the area code for Oakland?
The main area code for Oakland, California is 510. Oakland is now served by 2 area codes in total: 510, 341.
How many area codes does Oakland have?
Oakland has 2 area codes: 510, 341.
Why does Oakland have more than one area code?
As Oakland used up the numbers available in its original area code (510, in service since 1991), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Oakland number?
Dial all 10 digits — the area code (510 or 341) 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.