Area code 510 covers Oakland and surrounding communities in California.
Updated 8 October 2026
Area code 510 is in California, shown here with Oakland marked.
Now in Oakland
Pacific Time · UTC−8, UTC−7 in summer
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Typical business hours, 9 to 5 Monday to Friday.
Typical business hours, 9 to 5 Monday to Friday, shown as the blue arc. A guide to when a real Oakland office is likely to answer. It says nothing about who called you.
Source: North American Numbering Plan Administrator, retrieved 8 October 2026.
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Is area code 510 a scam?
No. Area code 510 is a legitimate area code serving Oakland since 1991. Scammers spoof caller ID to display 510 numbers, which is why complaints exist against a code that is itself genuine.
Neighbour spoofing is the reason a local-looking number is not a guarantee. A caller anywhere in the world can display a 510 number, and the number they display may belong to a real business in Oakland that has nothing to do with the call.
The callerAnywhere in the worldSets the caller ID their equipment sends.
What is displayed(510) 851-9556May belong to a real Oakland business.
Your phoneLooks localA nearby code and prefix make you likelier to answer.
530Area code 510 had 530 different numbers reported for spam calls in the 30 days to 8 October 2026.
147thArea code 510 ranks 147th of 331 US geographic area codes by spam complaint volume.
56%Of the 560 complaints about area code 510 in the 30 days to 8 October 2026, 56% were reported as a recorded message or robocall.
11%The most reported subject on area code 510 is reducing your debt (credit cards, mortgage, student loans), appearing in 11% of its complaints in the 30 days to 8 October 2026.
Why am I getting text messages from area code 510?
Texts from 510 numbers follow the same pattern as calls — mostly local businesses and services. Treat any text asking for payment or credentials as suspect regardless of the code.
The common patterns are a wrong-number opener that turns into conversation, an unsolicited job offer, and a crypto or investment tip. Do not reply, do not follow the link, and forward the message to 7726 (SPAM) to report it to your carrier.
Pattern 1Wrong-number openerTurns into conversation.
Pattern 2Unsolicited job offerDo not reply, do not follow the link.
Pattern 3Crypto or investment tipTreat any payment ask as suspect.
Report it7726Forward the message. It spells SPAM on a keypad.
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Area codes that overlay 510
Area code 510 shares its geographic footprint with one other code: 341. Overlays are laid over an existing area rather than splitting it, so all local calls require the full ten-digit number.
Area code 510 covers the East Bay, with Oakland as its center of gravity, along with Berkeley, Fremont, and Hayward. The economy here is more physical than the software-heavy image of the wider Bay Area suggests. The Port of Oakland is one of the busiest container ports on the West Coast and drives a logistics and trucking sector that spreads across the flatlands. Kaiser Permanente is headquartered in Oakland, making healthcare a major employer, and Fremont at the southern end of the 510 holds Tesla's original vehicle factory plus a dense cluster of advanced manufacturing and biotech firms. UC Berkeley and Lawrence Berkeley National Laboratory feed a steady stream of research spinouts into the same dialing area.
Who lives in the 510 region
Oakland had 439,418 residents in 2024, with a median household income of $101,600 and a median property value of $929,900 (DataUSA). The population is one of the most diverse in California: 27.3 percent of residents were born outside the country, 28.7 percent are Hispanic, and no single ethnic group forms a majority (DataUSA, 2024). The poverty rate of 13.4 percent alongside six-figure median income describes a region of sharp economic contrasts, sometimes block by block.
What a 510 number signals to a caller
A 510 number signals East Bay rather than San Francisco, and locals treat that as a meaningful distinction. Callers describe Oakland business culture as more direct and less performative than across the bay, with a strong preference for dealing with people who actually know the area. The region runs on Pacific Time, so East Coast callers should hold outreach until late morning their own time. Multilingual capability, particularly Spanish, Cantonese, and Vietnamese, is generally expected of consumer-facing operations in a city this international, and a local California presence tends to earn more pickups than an unfamiliar number from out of state.
Area code 510 serves Oakland and surrounding communities in California. It is in the Pacific Time zone.
What state is area code 510 in?
Area code 510 is in California. It is not in Little Rock — those are area code 501.
Is area code 510 toll free?
No. Area code 510 is a geographic area code serving Oakland, California. The toll-free codes are 800, 833, 844, 855, 866, 877, 888, and a call to a 510 number is charged at your normal rate.
Why am I getting calls from 510?
Calls displaying a 510 number come from businesses and individuals in the Oakland area, and from anywhere at all when caller ID is spoofed to look local. 530 510 numbers were reported to the FTC in the 30 days to 8 October 2026.
How do I block calls from area code 510?
Both iOS and Android can silence calls from unknown numbers, and every major US carrier offers free call-blocking. Blocking the whole of area code 510 is rarely worth it, because spoofed numbers change constantly and you would lose legitimate calls from Oakland.