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.
Pacheco is a census-designated place (CDP) in Contra Costa County, California. The population was 3,685 at the 2010 census. It is bounded by Martinez to the north and west, Concord to the east, and Pleasant Hill to the south.
The Yellow Line is a Bay Area Rapid Transit (BART) line in the San Francisco Bay Area that runs between Antioch and San Francisco International Airport (SFO). Some morning trains and all trains after 9 pm are extended from SFO to serve Millbrae station when the Red Line is not running. It serves 28 stations in Antioch, Pittsburg, Bay Point, Concord, Pleasant Hill, Walnut Creek, Lafayette, Orinda, Oakland, San Francisco, Daly City, Colma, South San Francisco, San Bruno, and Millbrae. It is the most-used BART line, and the only line with additional trains on weekdays. It runs for 62.2 miles (100.1 km), making it the system's longest line.
Tri Delta Transit, formally the Eastern Contra Costa Transit Authority, is a joint powers agency of the governments of Pittsburg, Antioch, Oakley, Brentwood, and Contra Costa County that provides bus service for the eastern area of Contra Costa County, California, United States. Tri Delta Transit local buses connect to the BART rapid transit system at Antioch, Pittsburg Center, Pittsburg/Bay Point and Concord. Tri Delta Transit buses also connect with County Connection bus service. In 2023, the system had a ridership of 1,304,700, or about 4,700 per weekday as of the third quarter of 2024.
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.
The Contra Costa Canal is a 47 mi (76 km) aqueduct in the US state of California. Its construction began in 1937, with delayed completion until 1948 due to World War II shortages in labor and materials. A portion of the canal's right of way has been developed as the Contra Costa Canal Regional Trail, a biking and walking trail, and is managed by the East Bay Regional Park District.
Samuel Conti was an American jurist who was a United States district judge of the United States District Court for the Northern District of California.
The Alameda County Superior Court, officially the Superior Court of California, County of Alameda, is the California superior court with jurisdiction over Alameda County as established by Article VI of the Constitution of California. It functions as the trial court for both criminal and civil cases filed in Alameda County.
The Superior Court of California, County of Ventura County, is the California superior court with jurisdiction over Ventura County.
The Superior Court of California, County of San Mateo is the California superior court with jurisdiction over San Mateo County.
Diana Becton, also known as Diana Becton Smith, is a former trial judge and is currently both the first woman and first African American to be elected district attorney in the history of Contra Costa County in California.
The Superior Court of California, County of Placer, is the California superior court with jurisdiction over Placer County. The main court was in the county seat of Auburn from its inception, with satellites in the county's townships, until it moved to Roseville in 2008.
Bradford Island is a 2,172-acre (879 ha) island of the Sacramento–San Joaquin River Delta, in Contra Costa County, California, United States. Bradford Island is inaccessible by roads, and is served by a ferry across the False River from nearby Jersey Island. Approximately 48 people lived on the island as of 2020. Other uses of land include wheat farming, cattle grazing, and natural gas extraction.
The Superior Court of California, County of Yolo County, is the California superior court with jurisdiction over Yolo County.
Mallard Island is a small island in Suisun Bay, at the confluence of the Sacramento and San Joaquin rivers. It is part of Contra Costa County, California. Its coordinates are 38°02′31″N121°55′07″W, and the United States Geological Survey measured its elevation as 3 ft (0.91 m) in 1981. It appears in a 1953 USGS map of the area.
The Superior Court of California, County of Inyo, also known as the Inyo County Superior Court or Inyo Superior Court, is the California superior court with jurisdiction over Inyo County.
The Superior Court of California, County of Sierra, also known as the Sierra County Superior Court or Sierra Superior Court, is the California superior court with jurisdiction over Sierra County.
The Superior Court of California, County of Kings, also known as the Kings County Superior Court or Kings Superior Court, is the California superior court with jurisdiction over Kings County.
The Superior Court of California, County of Nevada, also known as the Nevada County Superior Court or Nevada Superior Court, is the California superior court with jurisdiction over Nevada County.
The Superior Court of California, County of Orange, also known as the Orange County Superior Court or Orange Superior Court, is the California superior court with jurisdiction over Orange County.
