Alamo is an unincorporated community and census-designated place (CDP) in Contra Costa County. It is a suburb located in the San Francisco Bay Area's East Bay region, approximately 28 miles (45 km) east of San Francisco.
Alamo is equidistant between the city of Walnut Creek and the incorporated town of Danville. As an unincorporated community, Alamo does not have a government of its own. The community of Alamo is well known for its bucolic country feel, notable residents, and its affluent lifestyle.
People have lived in this area for over 5,000 years. The Tatcan Indians, a Bay Miwok tribe closely connected to the Saclans of Walnut Creek, lived in Alamo in the eighteenth century. After Mission San José was founded in 1797, its grazing area stretched throughout the San Ramon Valley. The Mexican land grant Rancho San Ramon was deeded to Mariano Castro and his uncle Bartolo Pacheco in 1833. It covered today’s Danville and Alamo. Alamo (from the Spanish álamo, "poplar") was named for the poplar trees that lined San Ramon Creek. The Alamo post office is the oldest continuously operated one in the valley, and was an important community gathering place.
In August 2007, a group of citizens launched a new initiative to incorporate the community, the latest in a series of attempts that go back to the early 1960s or before; it was defeated by referendum in March 2009. Previous failed Alamo incorporation efforts always included parts of other nearby unincorporated areas: Alamo-Danville (1964) and Alamo-Danville-San Ramon (1976).