Concord ( /kɒŋkərd/ kong-kərd; formerly Drunken Indian and Todos Santos) is the largest city in Contra Costa County, California, USA. At the 2010 census, the city had a population of 122,067. Originally founded in 1869 as the community of Todos Santos by Salvio Pacheco, the name was changed to Concord within months. The city is a major regional suburban East Bay center within the San Francisco Bay Area, and is located just 31 miles (50 km) east of San Francisco.
Concord is located at 37°58′41″N 122°01′52″W / 37.97806°N 122.03111°W / 37.97806; -122.03111. In terms of travelling distance on the ground, it is 29 miles (47 km) northeast of San Francisco, 22 miles (35 km) northeast from Oakland, 65 miles (105 km) southwest of Sacramento, and 51 miles (82 km) north of San Jose.
According to the United States Census Bureau, the city has a total area of 30.5 square miles (79.1 km²), all of it land.