California
(925) Area Code 925 — Concord, California
925 Area Code – Concord, California: Location, Time Zone & History
Build trust, look local, and grow your business with a phone number in area code 925. Instant activation, flexible forwarding, and clear pricing.
Map of Area Code 925
Available Phone Numbers
Choose from popular and easy-to-remember local numbers. Instant purchase and activation.
History & Cultural Notes
The East Bay's original area code, 510, had covered the whole region since splitting from 415 in 1991, but by March 14, 1998 it was split again, this time along the Berkeley Hills. The bay-shore cities kept 510, while the inland valleys received 925, taking in Contra Costa County and southeastern Alameda County communities such as Concord, Walnut Creek, Pleasanton, Livermore, Dublin, and Danville.
925 remains a standalone code without an overlay, though mandatory ten-digit local dialing arrived on October 24, 2021, partly to free up the nationwide 988 crisis line. The area is known for serious science: Lawrence Livermore National Laboratory, a Department of Energy nuclear research facility dating to 1952, and a Sandia National Laboratories campus both sit in Livermore. The Livermore Valley is also one of California's oldest wine regions, with commercial winemaking tracing back to the 1880s.
Locally, the code has its own bit of keypad trivia: dialed on a phone, 925 spells "WAL," long tied to Walnut Creek, one of the area's best-known cities and a hub for retail and professional services.