Contra Costa County , California

Contra Costa County: County in California, United States

Contra Costa County, CA locator map
Location of Contra Costa County, CA on California map.

About

Contra Costa County is a county located in the U.S. state of California. As of the 2010 census, the population was 1,049,025 and a population density of 505 people per km². After 9 years in 2019 county had an estimated population of 1,153,526 inhabitants. Its county seat is Martinez. The county was created 171 years ago in 1849.

Contra Costa County has a total area of 802.32 square miles (2078 km2).

Contra Costa County map

Contra Costa County, CA Quick Facts

Population : 1,153,526 (2019)
Country : United States of America
State : California
Area : 2078 km2
Water as percent of area : 10.93%
Land as percent of area : 89.07%
Named for : opposite coast
Altitude : 499 feet / 152 meters
Capital : Martinez
Establishment : January 01, 1850
Time Zone : Pacific Time Zone
Local time : 14:51:46 (19th April 2021)
Density : 555 Pop. per km² as of 2019
Population growth : 9.06% (2010-2019)

Contra Costa County, CA has 4 neighbors .

  • Martinez

The population of Contra Costa County increased by 9.06% in 9 years.

Year Population Method
2010 1,049,025 census
2011 1,065,440 estimation process
2012 1,077,548 estimation process
2013 1,093,401 estimation process
2014 1,108,876 estimation process
2015 1,124,405 estimation process
2016 1,137,268 estimation process
2017 1,145,535 estimation process
2018 1,150,519 estimation process
2019 1,153,526 estimation process

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People born in Contra Costa County, CA (14)

People born in Contra Costa County, CA, including actress Amanda Detmer, musician John Kiffmeyer, composer Andrea Datzman, you can see a list of people who born in Contra Costa County, CA.

Contra Costa County, CA Populated Places (more)

Cities, Towns, Neighborhoods & Other Populated Places in Contra Costa County, CA.

City Name Population Title
Concord 129,295 Capital city of state of New Hampshire, United States; county seat of Merrimack County, New Hampshire
Antioch 111,502 City in California, United States of America
Richmond 110,567 City in Contra Costa County, California, United States
San Ramon 75,995 City in California, United States
Pittsburg 72,588 City in California
Walnut Creek 70,166 City in Contra Costa County, California, USA
Brentwood 64,474 City in California, United States
Danville 44,510 Town in Contra Costa County, California
Oakley 42,543 City in California
Martinez 38,297 City in Contra Costa County, California, USA
Pleasant Hill 34,839 City in Contra Costa County, California, USA
San Pablo 30,990 City in Contra Costa County, California, United States
Lafayette 26,638 City in California
Hercules 26,276 Constellation in the northern celestial hemisphere
El Cerrito 25,508 City in Contra Costa County, California, United States
Orinda 19,926 City in California, USA

California Other Counties (more counties)

County Name Population Title
Los Angeles County 10,039,107 County in California, United States of America
Los Angeles 3,979,576 County seat of Los Angeles County, California; second largest city in the United States by population
San Diego County 3,338,330 San Diego County, founded in 1850, is one of 58 counties in the US state of California.
Orange County 3,175,692 County in California, United States
Riverside County 2,470,546 County in California, United States
San Bernardino County 2,180,085 County in California, United States
Santa Clara County 1,927,852 County in California, United States
Alameda County 1,671,329 County in California, United States
Sacramento County 1,552,058 County in California, United States
San Diego 1,423,851 City in San Diego County, California, United States, eighth largest city in the country by population
Laguna 1,370,232 Former census-designated place
San Jose 1,021,795 County seat of Santa Clara County, California; tenth largest city in the United States by population
Fresno County 999,101 County in California, United States
City and County of San Francisco 883,869 Consolidated city-county in California, United States
San Francisco 881,549 Consolidated city-county in California, United States
Ventura County 846,006 County in California, United States of America

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