🇺🇸 341 area code
Area code 341 covers Oakland, Fremont, Berkeley and Hayward and the surrounding area in California. It shares that territory with 510, so the same neighbourhood can have numbers in any of them. Enter a 341 number below for a free check before you call back.
- Location: Oakland, California
- Time zone: Pacific (UTC−8)
- In service since July 22, 2019
Look up a number
Validity, carrier, line type, and region on the first pass.
Area code 341 at a glance
Cities in the 341 overlay area
- Oakland
- Fremont
- Berkeley
- Hayward
- Alameda
- San Leandro
- Union City
- Richmond
- Castro Valley
- Crockett
Is a 341 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 341 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 341 number to people in California because a local-looking call is more likely to be answered. If a 341 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 341
341 entered service on July 22, 2019, as an overlay on 510, which had run short of numbers.
It is part of the 341/510 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Because 341 overlays the same ground, the cities listed are those of the codes it shares with.
FAQ
Area code 341 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 341?
Area code 341 is in California, United States. It covers Oakland, Fremont, Berkeley, Hayward, Alameda and San Leandro.
What time zone is area code 341?
341 is in the Pacific (UTC−8) time zone, and observes daylight saving time.
What area codes overlay 341?
510 serves the same area as 341. Numbers in all of them are local to one another.
When did area code 341 start?
341 entered service on July 22, 2019, created from 510.
How do I find out who called me from 341?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 341?
If you live in or near California, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 341 callers who will not leave a message are best looked up before you call back.
Got a call from 341?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.