what county is concord in ca
For the gold rush town formerly with this name, see Orleans Flat, California. Concord (/kÉÅkÉËrd/ CAWN-cord;) is the largest city in Contra Costa County, California. At the 2010 census, the city had a population of 122,067 making it the 8th largest city in the San Francisco Bay Area. Founded in 1869 as the community of Todos Santos by Salvio Pacheco, the name was changed to Concord within months.