510 Area Code — Oakland, California
Reviewed by Jordan Lee, Digital Safety Researcher — Last updated January 2026
About the 510 Area Code
Area code 510 covers Oakland, California—one of North America's most forward-leaning telecommunications markets, where VoIP, hosted PBX, and app-based calling have largely displaced traditional wireline infrastructure. All national carriers—AT&T Mobility, Verizon Wireless, and T-Mobile USA—compete for subscribers alongside cloud communication platforms. Oakland, Berkeley, and Fremont anchor this high-density corridor, which operates on Pacific time.
Key Information
- Region: Oakland
- State / Province: California
- Timezone: Pacific
- Major Cities: Oakland, Berkeley, Fremont
Area Code Overview
Area code 510 was created in 1991 as a split from the original 415 code, now serving Oakland, Berkeley, Fremont, Hayward, Richmond, and Alameda. Overlay code 341 was added in 2021. The 510 territory is economically diverse — Oakland is a major port city undergoing rapid gentrification alongside persistent poverty, Berkeley is a global university city, and Fremont hosts the largest concentration of Afghan Americans in the United States alongside a large South Asian community. This demographic range creates multiple distinct fraud targets within a single area code, from port logistics scams to public benefits fraud to immigrant-focused phishing.
Scam Patterns in 510
EDD Unemployment Benefits Fraud
California's Employment Development Department was defrauded of an estimated $11 billion during COVID-19 — the largest state unemployment fraud in US history. The East Bay remains an epicenter of EDD-related scam activity. Texts impersonate the EDD, claiming recipients must verify identity to continue benefits or that an overpayment must be repaid immediately — harvesting Social Security numbers, debit card numbers, and account passwords.
Cash Home-Buying Offer Scams
Oakland's volatile real estate market makes homeowners targets for unsolicited "cash offer" texts claiming an investor wants to buy their home as-is, closing in days. These extract property information, lead homeowners to fraudulent title companies, or collect "processing fees" before the buyer disappears.
Afghan and South Asian Community Impersonation
Fremont's Afghan-American community and the broader 510 South Asian population are targeted by texts in Dari, Pashto, and Urdu — impersonating community organizations, Afghan government offices, or immigration nonprofits. Victims pay for visa processing, document translation, or family reunification services that are never delivered.
VoIP and Spoofing Risk Assessment
Risk Level: HIGH
510 VoIP availability is broad — Oakland's tech-adjacent economy and large gig workforce mean VoIP lines are common for legitimate business purposes. EDD impersonators frequently use VoIP 510 numbers to appear as California state government contacts. Oakland's area code also carries community credibility, making spoofed 510 numbers effective for peer-to-peer fraud schemes.
What To Do If You Receive a Text From a 510 Number
Step 1: Know that EDD communicates by mail and through UI Online. The EDD does not send benefit notices or identity verification requests via text. See our guide on identifying government impersonation texts.
Step 2: Look up the number. Search at Who Sent That Text Message to check for spam reports and fraud associations before responding.
Step 3: Verify real estate offers through licensed agents. Legitimate cash buyers can be verified through the California Bureau of Real Estate and CA Secretary of State business registry. Do not share property documents in response to a text.
Step 4: Report. Forward to 7726 (SPAM). Report EDD fraud to the EDD fraud tip line at 1-800-229-6297. File with the FTC at reportfraud.ftc.gov.
Frequently Asked Questions
What area code is 510?
Area code 510 covers Oakland, Berkeley, Fremont, Hayward, Richmond, and Alameda in California's East Bay. It was split from the original 415 code in 1991 and shares its territory with overlay code 341.
Is area code 510 used for scams?
510 is a legitimate East Bay area code. It is associated with EDD unemployment benefit fraud, fake real estate cash offers, and targeted impersonation scams aimed at Afghan and South Asian communities in Fremont. Any unknown 510 text referencing government benefits, property purchases, or immigration assistance warrants verification.
Why is Fremont specifically targeted by multilingual immigration impersonation scams?
Fremont has the largest Afghan-American population in the United States, with a concentration in the Centerville and Irvington neighborhoods that creates a dense, trust-based community network. Scammers who craft Dari- or Pashto-language texts targeting this community face low-competition fraud territory — most consumer protection resources don't reach Afghan-language speakers — making 510 territory a high-return environment for community-specific fraud.
Related Area Codes
Carriers & Network Type for 510 Numbers
Network mix: Mobile-heavy — most 510 numbers are assigned to mobile lines.
Common Scam Patterns
FCC complaint data for 510 numbers includes:
- Tech support scam
- Robocall/Auto-dialer
- Spoofed caller ID
- Credit card services
If You Got a Text from 510
Who Typically Calls from the 510 Area Code?
Area code 510 covers Oakland, California—one of North America's most forward-leaning telecommunications markets, where VoIP, hosted PBX, and app-based calling have largely displaced traditional wireline infrastructure. All national carriers—AT&T Mobility, Verizon Wireless, and T-Mobile USA—compete for subscribers alongside cloud communication platforms. Oakland, Berkeley, and Fremont anchor this high-density corridor, which operates on Pacific time. Calls from 510 numbers originate in Oakland, California. Residents, local businesses, schools, medical offices, and government agencies in this region all use 510 numbers. If you received an unexpected call or text from a 510 number, it may be a neighbor, a local service provider, or — in some cases — an unwanted solicitor.
Because 510 is a legitimate, widely used area code, scammers sometimes spoof it to make their calls appear local and trustworthy. This technique — called neighbor spoofing — makes it more likely that recipients will answer. A reverse phone lookup is the fastest way to find out whether a 510 number is genuinely local or spoofed.
Is a 510 Phone Number Spam?
Not all 510 calls are spam, but the area code is not immune to robocall campaigns and phone scams. Common complaints about 510 numbers include warranty extension scams, debt collection harassment, IRS impersonation calls, and unsolicited insurance offers.
If a 510 number called you and didn't leave a voicemail, that's a red flag — legitimate callers typically leave a message. Use Who Sent That Text Message to look up the number instantly and see whether other users have flagged it as spam.
You can also report a suspicious 510 number directly from our lookup results, helping protect others in the community from the same caller.
Look Up a 510 Number Now
Enter any 510 area code phone number below and get instant results — carrier, line type, caller name (where available), and spam reports submitted by real users.
Other Area Codes in California
California has multiple area codes serving different regions. If the number you received isn't from 510, check one of the other California area codes below.
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