Contra Costa County 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. The county seat is Martinez. 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. Contra Costa County is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area.
Alamo is an unincorporated community and census-designated place (CDP) in Contra Costa County, California, in the United States. It is a suburb located in the San Francisco Bay Area's East Bay region, approximately 28 miles (45 km) east of San Francisco. Alamo is equidistant from the city of Walnut Creek and the incorporated town of Danville. As of the 2020 census, the population was 15,314.
Bay Point, formerly West Pittsburg and originally Bella Vista is a census-designated place located in the East Bay region of the San Francisco Bay Area in Contra Costa County, California. Bay Point is just west of Pittsburg, California, and northeast of Concord, California, on the southern shore of Suisun Bay. The population of Bay Point was 21,349 as of 2010. The Pittsburg/Bay Point Station of the Bay Area Rapid Transit (BART) rail system is located adjacent to Bay Point in Pittsburg. The community is traversed by a freeway, State Route 4, the California Delta Highway. Being unincorporated, Bay Point does not have its own police department. The community is policed by the California Highway Patrol and the Contra Costa County Sheriff's Office. The ZIP code is 94565, and the area code is 925.
The Town of Danville is located in the San Ramon Valley in Contra Costa County, California. It is one of the incorporated municipalities in California that use "town" in their names instead of "city". The population was 43,582 at the 2020 census. Since 2018, for five years in a row, Danville was named "the safest town in California".
San Ramon is a city in Contra Costa County, California, United States, located within the San Ramon Valley, and 34 miles (55 km) east of San Francisco. San Ramon's population was 84,605 per the 2020 census, making it the 4th largest city in Contra Costa County, behind Richmond, Concord and Antioch.
Walnut Creek is a city in Contra Costa County, California, United States, located in the East Bay region of the San Francisco Bay Area, about 16 miles east of the city of Oakland. Walnut Creek has a total population of 70,127 per the 2020 census, is located at the junction of the highways from Sacramento and San Jose (I-680) and San Francisco/Oakland (SR-24), and is accessible by BART. The city shares its borders with Clayton, Lafayette, Alamo, Pleasant Hill, and Concord.
Blackhawk is an unincorporated planned community and census-designated place located in Contra Costa County, California, United States, east of Danville and Oakland. As of the 2010 census it had a population of 9,354. Governed by county rules/regulations and a homeowner association (HOA), Blackhawk has a country club, two golf courses, sports complex, restaurants, and the adjacent Blackhawk Plaza. 24-hour security plus additional law enforcement contracted through the Contra Costa County Sheriff's Office is provided by HOA dues. The area is covered by the San Ramon Valley Fire Protection District. The ZIP code is 94506. The community is inside area code 925. Blackhawk is known for its uniform architecture and suburban lifestyle, with the median household income being $167,875 and median home price of $1,117,500.
The West Contra Costa Unified School District is the school district for western Contra Costa County, California. It is based in Richmond, California. In addition to Richmond, the district covers the cities of El Cerrito, San Pablo, Pinole, and Hercules and the unincorporated areas of Bayview-Montalvin Manor, East Richmond Heights, El Sobrante, Kensington, North Richmond, and Tara Hills.
The San Ramon Valley is a valley and region in Contra Costa County and Alameda County, in the East Bay region of the San Francisco Bay Area in northern California.
California's 10th congressional district is a congressional district in the U.S. state of California. Currently, the 10th district encompasses parts of the eastern San Francisco Bay Area. It is currently represented by Democrat Mark DeSaulnier.
Area code 925 is a telephone area code in the North American Numbering Plan for a northern part of the U.S. state of California. It was created in an area code split of area code 510 in 1998. The numbering plan area comprises the inland portions of the East Bay counties of Alameda and Contra Costa.
Mount Diablo Unified School District (MDUSD) is a public school district in Contra Costa County, California. It currently operates 29 elementary schools, 9 middle schools, and 5 high schools, with 7 alternative school programs and an adult education program. MDUSD is one of the largest school districts in the state of California, with over 56 school sites and a budget of approximately $270,000,000. The district has over 36,000 K-12 students, over 20,000 adult education students, and over 3,500 employees, including over 2,000 certificated educators. The district covers 150 square miles (390 km2), including the cities of Concord and Clayton; as well as most of Pleasant Hill and portions of Walnut Creek, Pittsburg, Lafayette, and Martinez; and unincorporated areas, including Pacheco, Clyde, and Bay Point.
Sycamore Valley Regional Open Space Preserve is a regional park in Contra Costa County, California, outside of Danville, California, United States that is part of the East Bay Regional Parks (EBRPD) system.
Dougherty Valley High School is a public high school located in the Windemere development of San Ramon, California, United States. The valley name comes from James Witt Dougherty, a 19th-century landowner and local politician.
The San Ramon Valley Fire Protection District provides fire protection and emergency medical services for the cities of Alamo, Blackhawk, Danville, Diablo, Camino Tassajara and San Ramon as well as southern areas of the Morgan Territory in California, United States. In all, the district is responsible for 155 square miles (400 km2) with a population of approximately 192,800.
The Contra Costa County Board of Supervisors is the governing body for Contra Costa County, California in the San Francisco Bay Area's East Bay region. Members of the Board of supervisors are elected from districts, based on their residence.
Tassajara, a variation of the Spanish word "tasajera", is an unincorporated community in Contra Costa County, California, United States. It is located on the east bank of Tassajara Creek, 6.5 miles (10 km) south-southeast of Mount Diablo, at an elevation of 709 feet. Together with Blackhawk it forms the Blackhawk-Camino Tassajara census designated place (CDP).
Rancho San Ramon was a 20,968-acre (84.85 km2) Mexican land grant in the southern San Ramon Valley of present-day Contra Costa County, California. Rancho San Ramon (Pacheco-Castro) was adjacent in the northern San Ramon Valley.
The Mount Diablo Thrust Fault, also known as the Mount Diablo Blind Thrust, is a thrust fault in the vicinity of Mount Diablo in Contra Costa County, California. The fault lies between the Calaveras Fault, the Greenville Fault, and the Concord Fault, all right-lateral strike-slip faults, and appears to transfer movement from the Calaveras and Greenville Faults to the Concord Fault, while continuing to uplift Mount Diablo.
