– Seaside is a city in Monterey County, California, United States. The 93955 zip code is located in the Seaside community of California in Monterey county. You can learn more about Real Estate in Seaside CA 93955 below, including current Homes For Sale: Condos, Townhomes, Foreclosures and Bank Owned Properties, Short Sales and more. Our Local Seaside CA Realtors can assist you with selling your home in California or buying your next piece of Real Estate in or around the Seaside CA 93955 community. Be sure to check out our FREE Instant Home Value wizard to get a quick report on your homes current estimated value.