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The city of Antioch is part of Contra Costa County in California.
Antioch, is part of Contra Costa County, which is part of the San Francisco Bay area, in California.
Antioch, California | is part of | Contra Costa County, California Antioch, California | is part of | California Antioch, California | is part of | Contra Costa County, California Contra Costa County, California | is part of | San Francisco Bay Area