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Web clayton, ca zip code 94517: Basic data & usps preferred city name preferred name, usps clayton, ca 94517 zip code type:. Web zip code 94517 is located in the county of contra costa in the state of california. Web zip code 94517 is located in the city of clayton, california and covers 47.725 square miles of land area. Web passports free boxes look up a zip code ™ faqs by address enter a corporate or residential street address, city, and state. 94517 zip code is spread between the. Web 94517 is the only zip code for clayton, ca enter an address to find the zip+4 and ensure faster mail delivery, or.