Contra Costa County, California

Contra Costa County
Contra Costa County
County
	Images, from left to right: Contra Costa County courthouse, Mount Diablo's North Peak
	Seal
	Interactive map of Contra Costa County
	Location in the state of California
Country	United States
State	California
Region	San Francisco Bay Area
Incorporated	February 18, 1850
Named for	"Opposite coast" (Spanish: Contra costa) of the San Francisco Bay
County seat	Martinez
Largest city	Concord (population and land area); Richmond (total area)
Government
• Type	Council–CAO
• Body	Board of Supervisors
• Chair	John Gioia
• Vice Chair	Federal D. Glover
• Board of Supervisors	Supervisors John Gioia; Candace Andersen; Diane Burgis; Ken Carlson; Federal D. Glover;
• County Administrator Office	Monica Nino
Area
• Total	804 sq mi (2,080 km2)
• Land	715.94 sq mi (1,854.3 km2)
• Water	81 sq mi (210 km2)
Highest elevation	3,852 ft (1,174 m)
Population (2020)
• Total	1,165,927
• Density	1,629/sq mi (629/km2)
Gross Domestic Product
• Total	US$76.341 billion (2022)
Time zone	UTC−8 (Pacific Time Zone)
• Summer (DST)	UTC−7 (Pacific Daylight Time)
Area code	510, 341, 925
FIPS code	06-013
GNIS feature ID	1675903
Congressional districts	8th, 9th, 10th
Website	contracosta.ca.gov

Contra Costa County (/ˌkɒntrə ˈkɒstə/ ^ⓘ; Contra Costa, Spanish for 'Opposite Coast') is a county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. As of the 2020 United States Census, the population was 1,165,927.^[6] The county seat is Martinez.^[7]^[8] It occupies the northern portion of the East Bay region of the San Francisco Bay Area and is primarily suburban. The county's name refers to its position on the other side of the bay from San Francisco.^[9] Contra Costa County is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area.

^ "Chronology". California State Association of Counties. Archived from the original on January 29, 2016. Retrieved February 6, 2015.
^ "District Offices | Contra Costa County, CA Official Website".
^ "County Administrator's Office | Contra Costa County, CA Official Website".
^ "Mount Diablo". Peakbagger.com. Archived from the original on May 2, 2015. Retrieved February 6, 2015.
^ "Gross Domestic Product by County and Metropolitan Area, 2022" (PDF). www.bea.gov. Bureau of Economic Analysis.
^ "Contra Costa County, California". United States Census Bureau. Retrieved January 30, 2022.
^ "Contra Costa County, California Official Website". Archived from the original on June 18, 2018. Retrieved January 24, 2009.
^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
^ "Contra Costa County, California Official Website - Visiting". Archived from the original on February 27, 2009. Retrieved January 24, 2009.