510 Area Code — Oakland, CA
Area code 510 serves Oakland and 4 other cities in California. Local time follows America/Los_Angeles. It overlays with 341, so 10-digit dialling is required.
- State
- California
- Primary city
- Oakland
- Timezone
- America/Los_Angeles
- In service since
- 1991
- Type
- Geographic
- Overlay codes
- 341
Cities Served by 510
The 510 area code covers 5 cities and communities in California.
- Oakland
- Berkeley
- Fremont
- Hayward
- Alameda
About Area Code 510
Area code 510 is a North American Numbering Plan (NANP) area code that has been in service since 1991. It is administered by NANPA on behalf of the FCC and serves the California region anchored on Oakland.
510 now shares its territory with an overlay code (341). 10-digit dialling is required for local calls within this region because the same 7-digit number can be assigned under either code.
Mobile numbers in 510 are portable: a person who moved away from Oakland may still carry a 510 mobile number on their device. If you receive an unexpected call from a 510 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in California, you may also interact with neighbouring or overlay codes (341). See the related codes section below to explore the rest of California.
Other California Area Codes
Continue exploring the California numbering plan.
510 Area Code FAQ
Where is area code 510?
Area code 510 is located in California, primarily serving Oakland and surrounding cities including Berkeley, Fremont, Hayward. The region operates on PT (America/Los_Angeles) time.
What state is 510 area code?
510 is a California area code. It was put into service in 1991 and shares its geographic footprint with overlay code 341.
Is 510 a scam area code?
510 is a legitimate North American area code allocated by NANPA to California. Like any geographic area code, scammers sometimes spoof 510 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 510 use?
Area code 510 operates on PT (America/Los_Angeles). Numbers in this area code follow standard California time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 510 phone number?
Yes. Use the reverse lookup widget above to enter a full 510 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.
What's the difference between 510 and 341?
510 and 341 cover the same California geographic area as overlay codes. Calls between them are local, but you must dial all 10 digits. New phone numbers in this region are assigned from either pool depending on what's available with the carrier at signup.