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The 94509 zip code is located in the Antioch community of California in Contra Costa county. You can learn more about Real Estate in Antioch CA 94509 below, including current Homes For Sale: Condos, Townhomes, Foreclosures and Bank Owned Properties, Short Sales and more. Our Local Antioch CA Realtors can assist you with selling your home in California or buying your next piece of Real Estate in or around the Antioch CA 94509 community. Be sure to check out our FREE Instant Home Value wizard to get a quick report on your homes current estimated value.