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Web 94509 & 94531 are the only zip codes for antioch, ca enter an address to find the zip+4 and ensure faster mail. Web zip code 94531 is located in the city of antioch, california and covers 14.028 square miles of land area. Look up a zip code. Web look up a zip code ™. 94531 zip code is spread between the. Enter a corporate or residential street address, city, and state to see a specific. Web this page provides an overview of detailed maps of zip code 94531, california. Web zip code 94531 is located in the county of contra costa in the state of california.