Concord formerly, Drunken Indian and Todos Santos) is the largest city in Contra Costa County, California, USA. The city has a total population of 127,000. 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.