The 341 area code is an overlay serving California’s East Bay, layered over the well-known 510 code across Oakland and the inner East Bay. Introduced in 2019 to supply new phone numbers for the region, 341 covers the exact same territory as 510. If a 341 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 341 at a Glance
| Detail | Information |
|---|---|
| Area Code | 341 |
| State | California (CA) |
| Major Cities | Oakland, Berkeley, Fremont, Hayward |
| Time Zone | Pacific Time (PT) |
| Country Code | +1 (USA) |
| Overlay Codes | 510 (co-located) |
Geographic Coverage & Major Cities
Area code 341 covers the inner East Bay of the San Francisco Bay Area, spanning western Alameda County and western Contra Costa County. Because it is an overlay, it shares the identical footprint of the 510 area code rather than covering a separate zone.
Cities and communities served by the 341 area code include:
- Oakland – the largest city in the East Bay and a major Pacific port
- Berkeley – home to the University of California, Berkeley
- Fremont & Hayward – major cities in southern Alameda County
- Richmond, Alameda & San Leandro – established East Bay communities
As a newer code over one of the Bay Area’s densest regions, 341 numbers are typically assigned to residents and businesses who obtained phone service after the region’s original 510 numbers grew scarce.
A Brief History of Area Code 341
Area code 341 was activated in 2019 as an all-services overlay on the 510 region. The 510 code itself was created in 1991 when it split from San Francisco’s 415. An overlay adds a second area code across the same geographic area, so existing 510 customers kept their numbers while new lines could be assigned either 510 or 341. The East Bay has used mandatory 10-digit dialing ever since to keep every number unique.
Time Zone & Best Time to Call
Numbers in the 341 area code use Pacific Time (PT). The region observes Daylight Saving Time, shifting from PST (UTC-8) to PDT (UTC-7) between March and November each year.
How to Dial Phone Numbers in Area Code 341
Because 341 is an overlay of 510, the East Bay requires 10-digit dialing on every call.
Calling within the United States or Canada
- 10-digit dialing: Always include the area code – 341-XXX-XXXX.
- 11-digit dialing: You can also dial 1-341-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 341 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 341 XXX XXXX
- From any mobile phone worldwide: +1 341 XXX XXXX
Is Area Code 341 a Scam? Safety & Protection Tips
Area code 341 is a legitimate California area code – a call from it is not fraudulent by default. However, scammers frequently spoof local codes like 341, faking the caller ID so their number appears to come from a trusted East Bay line. Neighbor spoofing, which mimics the first six digits of your own number, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Bank & card fraud alerts | Claims of “suspicious activity” seeking your account details |
| Utility shut-off threats | Demands for immediate payment to avoid disconnection |
| Package delivery scams | Fake texts or calls about a “failed delivery” with a bad link |
How to report, block, and look up 341 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in California
Area code 341 sits alongside several other Bay Area codes:
- 510 – the original East Bay code that 341 overlays (see our 510 area code guide)
- 925 – the inland East Bay and Tri-Valley (see our 925 area code guide)
- 415 – San Francisco and Marin County (see our 415 area code guide)
- 650 – the San Francisco Peninsula (see our 650 area code guide)
Explore more codes across the state on our California area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border California:
Frequently Asked Questions About Area Code 341
Where is the 341 area code located?
Area code 341 covers California’s East Bay, including Oakland, Berkeley, Fremont, and Hayward. It operates on Pacific Time as an overlay of area code 510.
What is the difference between 341 and 510?
There is no geographic difference. 341 is an overlay covering the exact same area as 510; it was added simply to supply more phone numbers as the East Bay grew.
Is 341 a landline or cell phone area code?
Both. Area code 341 serves landlines, mobile phones, and VoIP numbers throughout the East Bay.
Should I answer a call from an unknown 341 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 341 Guides
- Is a 341 call safe? Read Is area code 341 a scam? Spam & safety guide.
- Local coverage: see the Oakland area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.