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510 Area Code

Area code 510 serves Oakland, Hayward, Berkeley, Richmond, San Leandro and nearby communities in California. It has been in service since September 2, 1991, when it was split from 415.

StateCalifornia
Time zonePacific
Local time now…
Prefixes in use786
Overlay with341
Projected to run out2073
OaklandHaywardBerkeleyRichmondSan LeandroAlamedaCastro ValleyUnion CitySan PabloSan LorenzoHerculesEl CerritoAshlandAlbanyPinoleEl SobranteCherrylandEmeryvillePiedmontFairviewRodeoFranklinKensingtonOaklandHaywardBerkeleyRichmond
Cities and towns served by area code 510

Who issues 510 numbers

Mobile 26%VoIP and cable 25%Landline 48%

Share of the 786 prefixes (the three digits after 510) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T (Pacific Bell)278
AT&T Mobility78
T-Mobile65
Verizon Wireless60
Verizon Business (MCImetro)48
Metropcs45
Lumen (Level 3)43
Onvoy (Sinch)40

Cities and towns in area code 510

CityPopulationOther area codes
Oakland440,838341
Hayward157,113341
Berkeley121,911341
Richmond114,861341
San Leandro85,353341
Alameda76,876341
Castro Valley65,389341
Union City65,282341
San Pablo31,678341
San Lorenzo29,453341
Hercules26,326341
El Cerrito26,121341
Ashland22,784341
Albany19,195341
Pinole18,543341
El Sobrante15,823341
Cherryland14,575341
Emeryville13,251341
Piedmont10,642341
Fairview10,033341
Rodeo8,735341
Franklin7,487341
Kensington5,292341

Got a call from 510?

A 510 number was originally issued in California, but that does not prove the caller is there. 25% of 510 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 786 prefixes in area code 510

Format: (510) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 510

Where is area code 510?
Area code 510 is in California. It covers Oakland, Hayward, Berkeley, Richmond, San Leandro, Alameda and 17 more cities and towns.
What time zone is area code 510?
Area code 510 is in the Pacific time zone.
Is 510 a toll-free number?
No. 510 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 510 share its area with 341?
341 and 510 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 510 run out of numbers?
NANPA's latest forecast projects the 341/510 overlay to exhaust in the fourth quarter of 2073. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in California