Alamo is an unincorporated community and census-designated place (CDP) in Contra Costa County, California, situated in the San Ramon Valley. As of the 2020 United States Census, the population was 15,314.
Alamo is characterized by its affluent, residential nature with large homes and properties. It does not have a municipal government but is served by Contra Costa County for local services.
The community is known for its scenic beauty, including views of Mount Diablo, and its high quality of life.