Concord (/ˈkɒŋkɔːrd/ KONG-kord) 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. The city is a major regional suburban East Bay center within the San Francisco Bay Area, and is 29 miles (47 kilometres) east of San Francisco.
Pittsburg is an industrial city in Contra Costa County, California. The population was 63,264 at the 2010 census. It is located on the southern shore of the Suisun Bay in the East Bay region of the San Francisco Bay Area.
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