510 Area Code

California, USA

Local time now · Pacific Time

12:46 AM

Area code 510 is in California, USA, serving Oakland, Fremont, Berkeley and San Leandro. It uses Pacific Time — the time there now is 12:46 AM. 341 is an overlay for the same area, so local calls need 10-digit dialing. In service since 1991.

Area code	510
Location	California, USA
Major cities	Oakland, Fremont, Berkeley, San Leandro, Alameda, Union City, Castro Valley, Newark
Time zone	Pacific Time
Overlay codes	341
In service since	1991

Other area codes in California

209 213 279 310 323 350 357 369 408 415 424 442 530 559 562 619 626 628 650 657 661 669 707 714 738 747 760 805 818 820 831 837 840 858 909 916 925 949 951

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Frequently asked questions

Where is area code 510?

California, USA — including Oakland, Fremont, Berkeley, San Leandro and Alameda.

What time zone is area code 510?

Pacific Time.

How do I call a 510 number from abroad?

Dial your international access code, then 1 (the country code), then 510 and the 7-digit number — for example +1 510 555 0100. From the UK or India dial 00 1 510 …; from Bangladesh 00 1 510 … .

Is a call from 510 a scam?

Not by itself — 510 is an ordinary geographic area code in California. Numbers can be spoofed, so be careful with unexpected calls asking for money or personal details.

Sources: North American Numbering Plan Administrator (NANPA) NPA database (10/25/2026); major cities from Wikidata (CC0). An area code shows where a number was first assigned — with number portability and mobile phones, the caller may be anywhere.