Contra Costa County is located in California and encompasses most cities located in the East Bay across from the city of San Francisco. The county seat of Contra Costa is Martinez, California. As of 2020, the population of Contra Costa County was 1,165,927 residents. The county is primarily suburban. Contra Costa has a total area of 804 square miles. It is the ninth most populous county in the state. Adjacent counties include Solano County – north, Sacramento County – northeast, San Joaquin County – east, and Alameda County – south. 
The cities of Contra Costa County include: Antioch, Brentwood, Clayton, Concord, Town of Danville, El Cerrito, Hercules, Lafayette, Martinez, Town of Moraga, Oakley, Orinda, Pinole, Pittsburg, Pleasant Hill, Richmond, San Pablo, San Ramon and Walnut Creek.
The subarea of West County includes the the cities of El Cerrito, Richmond, San Pablo, Pinole, and Hercules, as well as the unincorporated communities of Kensington, El Sobrante, North Richmond, Rodeo, Crockett, and Port Costa.
Central County is divided into three areas: Lamorinda, including of the cities of Lafayette, Moraga, and Orinda, and the unincorporated area of Canyon. North Central County includes of the cities of Walnut Creek, Pleasant Hill, Concord, Clayton, and Martinez, as well as the unincorporated areas of areas of Pacheco, Vine Hill, Clyde, the Pleasant Hill BART station, and Saranap.
The San Ramon Valley includes the cities of Danville and San Ramon, and the unincorporated communities of Alamo, Blackhawk, and Tassajara. East County includes the cities of Pittsburg, Antioch, Oakley, and Brentwood, as well as the unincorporated communities of Bay Point, Bethel Island, Knightsen, Discovery Bay, and Byron.
Contra Costa County has the second-highest median income for families in California and is home to many Fortune 500 companies including Chevron and Shell Oil Company. Contra Costa County has a few notable places, including the Concord Naval Weapons Station, which is one of the largest military installations in the United States. The most notable landmark in the county is Mount Diablo, which is 3,849 feet. It is the centerpiece of Mt. Diablo State Park, one of many recreation areas residents and visitors can enjoy for hiking and biking. The East Bay Regional Park District is comprised of more than 100,000 acres within 65 parks, including more than 1,200 miles of trails. The county also has a notable town called Walnut Creek, which is known as the most affluent town in California.
The average commute time for residents living in the county is 42 minutes and 33 seconds, which is shorter than the national average). Most residents drive their own cars to work (about 83 percent). There are over 4,000 businesses in Contra Costa County, with an average revenue per business being $2.6 million.
The 2020 census shows Contra Costa County as having the highest Asian percentage, after Honolulu County, Hawaii. Approximately 39% of the population in Contra Costa is Asian, which is largely made up of Chinese, Indian Vietnamese and Filipino descent.
Through the establishment of the BART system, changing Highway 24 into an improved roadway and adding a 4th bore to Caldecott Tunnel in close proximity to Walnut Creek and Concord, demographic trends in this region have changed. These cities are now edge cities.
The effects of the housing value crash (2008-2011) was different in many areas of the county. Houses in prosperous areas with good schools had only modest drops, while houses recently built out east experienced a severe drop due to unemployment and mortgage foreclosures. Homes values rebounded as people recovered from the recession.
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