What area code is 510?
Here's everything about it.
Instant lookup for the 510 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
510 at a glance
Summary
Cities & regions served by 510
Oakland5 communities on record for 510.
Where 510 sits on the map
Overlay: 341Coverage area
About the 510 region
510 covers Oakland in California, including Fremont, Hayward, Richmond, Berkeley and Alameda. The code has been in service since 1991.
As the Oakland region grew, 510 ran low on available numbers, so 341 was added as an overlay code over the same geographic area. Both codes are local to each other and 10-digit dialing applies throughout.
Used until 1981 for TWX service Split of 415; 1998: split to create 925; 2019: overlaid by 341.
Who called me from 510?
Community reports- Caller ID is trivially spoofed: an incoming call that displays 510 does not prove the caller is really in the 510 region or even in the United States.
- Avoid calling back unknown one-ring numbers — some premium-rate scams rely on curiosity callbacks.
- Never share verification codes, payment details, or remote access during an unsolicited call, even if the caller claims to be your bank or a government agency.
- When a 510 call pressures you to act immediately, hang up and contact the organization directly through its official number.
Be the first to add a community report for a 510 number below.
Frequently asked questions
FAQWhat area code is 510?+–
510 is a telephone area code serving Oakland in California, United States, in service since 1991.
Where is area code 510 located?+–
It covers Fremont, Hayward, Richmond, Berkeley and Alameda in California.
What cities are in area code 510?+–
Major communities on record include Fremont, Hayward, Richmond, Berkeley and Alameda, among others. The code's territory spans the Oakland region of California.
What time zone is 510?+–
510 observes Pacific (PT), which is UTC−8 / −7 DST and follows daylight saving time.
When did area code 510 start?+–
510 entered service in 1991. Its history: used until 1981 for TWX service Split of 415; 1998: split to create 925; 2019: overlaid by 341.
Why do calls to 510 require 10-digit dialing?+–
510 shares its territory with overlay code 341. Because both codes serve the same geographic area, the phone network needs all 10 digits to route a call, and calls between the codes are still local.
Is 510 a scam area code?+–
Scam and robocall traffic can use any North American code, 510 included — caller ID is easy to spoof, so the code alone does not tell you who is really calling. Check the community reports on this page before calling back an unknown 510 number, and report anything suspicious.
Can I get a 510 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 510 number regardless of where you physically live.