Atherton is an incorporated town in San Mateo County, California, United States. The 94027 zip code is located in the Atherton community of California in San Mateo county. You can learn more about Real Estate in Atherton CA 94027 below, including current Homes For Sale: Condos, Townhomes, Foreclosures and Bank Owned Properties, Short Sales and more. Our Local Atherton CA Realtors can assist you with selling your home in California or buying your next piece of Real Estate in or around the Atherton CA 94027 community. Be sure to check out our FREE Instant Home Value wizard to get a quick report on your homes current estimated value.