Area Code 925 — Oakland, California

NANP area code

925

UTC−8, UTC−7 during daylight saving

State
California
Primary city
Oakland
Time zone
Pacific
In service
1998

The code reaches 28 communities and 3 counties across California.

Was this call legitimate?

The area code itself carries no risk signal. 925 is assigned to Oakland, California, so a call from it is consistent with a real caller in that area — but the digits alone prove nothing, because they can be forged.

Caller ID is set by whoever places the call, not verified by the network. That is why neighbour spoofing works: an operation anywhere in the world can display a number that matches the area code — and often the first three digits after it — of the person being called, so the call looks local. Every community in the 925 territory is a plausible-looking origin for a forged 925 number, which is why one can be made to look like a neighbour to so many people.

If you did not recognise the call: let it go to voicemail — a legitimate caller with real business will leave one. Do not return the call using the number shown; look the organisation up independently and call the number you found. Never confirm personal details, card numbers, or one-time codes to someone who called you, however plausible the number looked.

Codes.zone publishes no complaint counts, risk scores, or caller identities. We hold no data on individual numbers and will not estimate what we cannot source.

Local time and when to call back

Time there now

Pacific · UTC−8, UTC−7 during daylight saving

Reasonable callback window

8:00 AM – 9:00 PM

local time in Pacific

Federal rules bar telemarketing calls to a residence outside 8:00 AM–9:00 PM in the called party's own time zone. It is a sensible bound for a personal callback too — and a caller who rang you well outside it was not observing it.

Overlay codes

925 is the only area code serving its territory — it has no overlay in the current numbering plan for California. Where a region has no overlay, a number's area code still corresponds to a single geographic area.

Cities served

largest 20 by ZIP count
Communities served by area code 925, ranked by how many ZIP codes each holds.
CityZIP codesCounty
Oakland26Alameda County
Concord8Contra Costa County
Fremont5Alameda County
Walnut Creek4Contra Costa County
Moraga3Contra Costa County
Antioch2Contra Costa County
Danville2Contra Costa County
Livermore2Alameda County
Pleasanton2Alameda County
San Ramon2Contra Costa County
Alamo1Contra Costa County
Benicia1Solano County
Bethel Island1Contra Costa County
Brentwood1Contra Costa County
Byron1Contra Costa County
Canyon1Contra Costa County
Clayton1Contra Costa County
Diablo1Contra Costa County
Discovery Bay1Contra Costa County
Dublin1Alameda County

8 further communities not listed. All California area codes →

Each point is a community served by 925, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.
  • Reference points and footprint
  • Not an official NANPA boundary
  • Not a USPS delivery area

Scope every community matched to 925. Source geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot), GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . Coordinates are place reference points, not boundaries.

Counties

Prefixes inside 925

We do not publish the NXX prefixes inside 925. The assignment of prefixes to rate centres comes from LERG routing data, which is proprietary, and we will not estimate it from postal data — ZIP codes and telephone prefixes do not map onto each other. Awaiting a clean-rights NPA-NXX source.