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      Map of Clayton, CAMap of Clayton, CAExpand Map

      Post Offices in Clayton, CA

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      1. United States Postal Service

      United States Postal Service
      800-275-8777Call Now
      Post OfficesPackaging MaterialsMail & Shipping Services

      6150 Center St, Clayton, CA, 94517

      OPEN NOW:9:00 am - 5:00 pm

      From Business: Visit your local Post Office™ at 6150 Center St! The U.S. Postal Service® (USPS®) is the only organization in the country to regularly deliver to every residential and business…

      2. United States Postal Service

      United States Postal Service
      925-280-1941Call Now
      Federal GovernmentGovernment Offices

      1221 Rossmoor Pkwy, Walnut Creek, CA, 94595

      OPEN NOW:9:00 am - 5:00 pm

      3. United States Postal Service

      United States Postal Service
      800-275-8777Call Now

      3109 Knightsen Ave, Knightsen, CA, 94548