Contra Costa County, website

Contra Costa County in California uses area codes 510 and 925. This page is a phonebook directory where you will find the physical address and contact information of the most relevant government offices in Contra Costa, including the Clerk’s Office, Sheriff’s Office, and the Health Department. 

Sheriff’s Office

1850 Muir Road, Martinez, CA 94553

Phone: (925) 655-0000

Superior Court

725 Court Street
Martinez, CA 94553
Phone: (925) 608-1000

District Attorney’s Office

900 Ward St.
Martinez, CA 94553
Phone: (925) 957-2200

Fax: (925) 957-2240

Clerk-Recorder Office

555 Escobar Street
Martinez, CA 94553

Phone: (925)-335-7900

Treasurer -Tax Collector

625 Court St., Ste. 100
Martinez CA 94553

Phone: (925) 957-5280

Health Department

2355 Stanwell Cir., Concord, CA 94520

Phone: (925) 646-5275

Contra Costa County Jail

901 Court St., Martinez, CA 94553

Phone: (925) 335-4600

Emergency Management

1850 Muir Road, Martinez, CA 94553 

Phone: (925) 646-2441

Social Services

1025 Escobar Street
4th Floor, Martinez, CA 94553

Phone: (925) 655-2051

Fire Department

4005 Port Chicago Highway, Suite 250
Concord, CA 94520-1180

Phone: (925) 941-3300
Fax: (925) 941-3309

Email: [email protected]

Department of Education

77 Santa Barbara Rd., Pleasant Hill, CA 94523

Phone: (925) 942-3388