925 Area Code
Contra Costa County, California
Area code 925 is located in Contra Costa County, California. It covers Concord, Walnut Creek, and surrounding areas in the Pacific time zone (UTC-8). Administered by NANPA.
Where is area code 925?
Area code 925 is located in Contra Costa County, California. It covers Concord, Walnut Creek, and surrounding areas in the Pacific time zone (UTC-8).
Cities Covered by Area Code 925
Area code 925 primarily serves the Contra Costa County area of California. The exact coverage includes Concord, Walnut Creek, and Antioch, along with surrounding communities and suburbs.
Time Zone
Pacific Time — UTC-8
Area code 925 operates in the Pacific Time Zone. When calling 925 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 925
Area code 925 was introduced in 1998 as a geographic area code serving Contra Costa County, California. It remains the primary area code for this region. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.