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The 94521 zip code is located in the Concord community of California in Contra Costa county. You can learn more about Real Estate in Concord CA 94521 below, including current Homes For Sale: Condos, Townhomes, Foreclosures and Bank Owned Properties, Short Sales and more. Our Local Concord CA Realtors can assist you with selling your home in California or buying your next piece of Real Estate in or around the Concord CA 94521 community. Be sure to check out our FREE Instant Home Value wizard to get a quick report on your homes current estimated value.