Concord (/ˈkɒŋkərd/ KON-kerd)[10] is the most populous city in Contra Costa County, California, United States.

[12][13] Founded in 1869 as Todos Santos by Don Salvio Pacheco II, a noted Californio ranchero, the name was later changed to Concord.

[9] The valleys north of Mount Diablo were inhabited by the Miwok people, who hunted elk and fished in the numerous streams flowing from the mountain into the San Francisco Bay.

The crops grown included grapes, walnuts, almonds, wheat, hay, and even tomatoes.

On the evening of July 17, 1944, a massive explosion instantly killed 320 sailors, merchant seamen, and civilians working at the pier.

A subsequent refusal by 258 black sailors to load any more ammunition was the beginning of the Navy's largest-ever mutiny trial, in which 50 men were found guilty.

[17] According to the United States Census Bureau, the city has a total area of 30.5 square miles (79 km2), all of it land.

The focal point of downtown Concord is Todos Santos Plaza, which encompasses an entire city block and is known for its farmers market, free summer concerts, and large number of surrounding restaurants.

Concord has a warm-summer Mediterranean climate (Köppen Csb), with warm, dry summers and cool, wet winters.

Official data from the National Weather Service cooperative station in Concord shows average January temperatures are a maximum of 57.2 °F (14.0 °C) and a minimum of 41.6 °F (5.3 °C).

[28] Federally, Concord is in California's 10th congressional district, represented by Democrat Mark DeSaulnier.

[29] Concord has been primarily a bedroom community for San Francisco and Oakland over the last forty years, but during the last decades, jobs within the city have increased.

Concord also has a strong retail sector including the Sunvalley Shopping Center, which used to be one of the 50 largest malls in the United States,[31] auto dealerships, and Costco.

The station functioned as a World War II armament storage depot, supplying ships at Port Chicago.

[34] The tidal area was transferred to the U.S. Army Surface Deployment and Distribution Command (SDDC) and is now known as Military Ocean Terminal Concord (MOTCO).

[36][37] The city is working on a reuse plan that may include developing the land while keeping a large portion for open-space and parks projects.

Buses run from the North Concord BART station to Martinez, the county seat.

Concord is primarily served by radio stations from the San Francisco and Sacramento markets.

The Clayton Valley Charter High School operates a student-run rock station licensed to Concord, KVHS.

De La Salle's football team holds the U.S. record winning streak of 151 games, set between 1992 and 2004.

In August 2014, a Hollywood film titled When the Game Stands Tall was released with the plot line based on their 151-game winning streak.

Concord High School won the 2010 Northern California Boys Division II Football Championship, coached by Brian Hamilton.

Ygnacio Valley High School won the 1987 Northern California Boys Division I Basketball Championship, coached by Jim Grace.

Concord is also home to the 21-time World Champion Blue Devils Drum and Bugle Corps.