925 area code — Walnut Creek, CA geographic
- State
- California
- Major area
- Walnut Creek
- Time zone
- Pacific
- In service since
- 1998-03-14
- Split from
- 510
- Active prefixes
- 631
- Rate centers
- 17
- Carriers
- 32
- Projected exhaust
- 3Q 2051
The 925 area code covers Walnut Creek, California, Pacific time zone, and dates back to March 14, 1998. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.
NANPA lists 631 active NXX prefixes in 925, assigned to 32 carriers. 437 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 17 rate centers (billing localities).
Official projections put exhaust at 3Q 2051.
The dialing plan is 1+10D for home-NPA local calls and 1+10D across codes.
To check where a specific 925 number was issued, look up its six-digit prefix; to check who is actually calling, ignore the display and verify through an official callback number — caller ID is assertable and routinely spoofed.
Its parent code is 510, which it left in 1998.
Largest localities in 925
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Walnut Creek | 102 | — |
| Concord | 88 | — |
| Pleasanton | 76 | — |
| Antioch | 65 | — |
| Livermore | 49 | — |
| Bishop Ranch | 43 | — |
| Dublin-san Ramon | 41 | — |
| Danville | 38 | — |
| Martinez | 21 | — |
| East Contra Costa | 21 | — |
FAQ
Is 925 a toll-free number?
No. 925 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.
Will 925 run out of numbers?
NANPA's current forecast projects exhaust in 3Q 2051 — decades of capacity remain.
Why am I getting spam calls from 925 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 925 number does not prove the call originated there — see our guide to spotting spoofed calls.