Contra Costa County , California

Contra Costa County: County in California, United States

Contra Costa County locator map
Location of Contra Costa County 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 10 years in 2020 county had an estimated population of 1,152,333 inhabitants. Its county seat is Martinez. The county was created 171 years ago in 1849.

View of Mount Diablo and CA Highway 24 from Lafayette Heights image
View of Mount Diablo and CA Highway 24 from Lafayette Heights
View of Mount Diablo and CA Highway 24 from Lafayette Heights image

Geography

Contra Costa County is located at 37°55'24"N 121°57'4"W (37.9234200, -121.9512100). It has 4 neighbors: Alameda County, Sacramento County, San Joaquin County and Solano County.

Contra Costa County map

The largest city of Contra Costa County is Concord with a population of 128,544. Other cities include, Antioch population 111,605, Richmond population 110,038, San Ramon population 82,865 and Pittsburg population 72,622. See all Contra Costa County cities & populated places.

Contra Costa County Quick Facts

Population : 1,152,333 (2020)
Country : United States of America
State : California (United States)
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 : 20:21:04 (21st October 2021)
Density : 555 Pop. per km² as of 2020
Population growth : 8.97% (2010-2020)

Contra Costa County has 4 neighbours.

  • Martinez

Demographics

The population of Contra Costa County increased by 8.97% in 10 years.

Year Population % Change Method
2010 1,049,025 - census
2011 1,065,440 1.54% estimation process
2012 1,077,548 1.12% estimation process
2013 1,093,401 1.45% estimation process
2014 1,108,876 1.4% estimation process
2015 1,124,405 1.38% estimation process
2016 1,137,268 1.13% estimation process
2017 1,145,535 0.72% estimation process
2018 1,150,519 0.43% estimation process
2019 1,153,526 0.26% estimation process
2020 1,152,333 -0.1% estimation process

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People born in Contra Costa County (12)

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

  • Marc Bonilla (American musician) he was born in 03/07/1955
  • Bob Gaillard (American basketball player-coach) he was born in 23/10/1940
  • Ron Luce (American evangelist) he was born in 11/07/1961
  • William Jefferson Hunsaker (American lawyer) he was born in 21/09/1855
  • Frank Henry Kerrigan (United States federal judge) he was born in 17/09/1868
  • Dino Waldren (American rugby union player) he was born in 11/07/1991
  • Anthony Sadler (American actor, television personality and writer) he was born in 13/07/1992
  • Carolyn Rouse (American anthropologist) she was born in 20/07/1965
  • Flavia Camilla (American actress)

Other places with the same name (1)

Contra Costa County Populated Places (more)

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

City Name Population Title
Concord 128,544 Capital city of state of New Hampshire, United States; county seat of Merrimack County, New Hampshire
Antioch 111,605 City in California, United States of America
Richmond 110,038 City in Contra Costa County, California, United States
San Ramon 82,865 City in California, United States
Pittsburg 72,622 City in California
Walnut Creek 69,936 City in Contra Costa County, California, USA
Brentwood 65,017 City in California, United States
Danville 44,883 Town in Contra Costa County, California
Oakley 42,710 City in California
Martinez 38,027 City in Contra Costa County, California, USA
Pleasant Hill 34,781 City in Contra Costa County, California, USA
San Pablo 30,779 City in Contra Costa County, California, United States
Hercules 26,221 City in western Contra Costa County, California
Lafayette 25,992 City in California
El Cerrito 25,403 City in Contra Costa County, California, United States
Bay Point 21,534 Census designated place in California

California Other Counties (more counties)

County Name Population Title
Los Angeles County 9,943,046 County in California, United States of America
Los Angeles 3,970,219 County seat of Los Angeles County, California; second largest city in the United States by population
San Diego County 3,332,427 San Diego County, founded in 1850, is one of 58 counties in the US state of California.
Orange County 3,166,857 County in California, United States
Riverside County 2,489,188 County in California, United States
San Bernardino County 2,189,183 County in California, United States
Santa Clara County 1,907,105 County in California, United States
Alameda County 1,662,323 County in California, United States
Sacramento County 1,559,146 County in California, United States
San Diego 1,422,420 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 1,013,616 County seat of Santa Clara County, California; tenth largest city in the United States by population
Fresno County 1,000,918 County in California, United States
Kern County 901,362
San Francisco County 866,606 County, coextensive with the city of San Francisco, California, United States
San Francisco 866,606 Consolidated city-county in California, United States