Alamo is an unincorporated community and census-designated place (CDP) in Contra Costa County, California state. It is located in the East Bay region of the San Francisco Bay Area. The population was 14,750 as of the 2010 census. Alamo was named by the Spanish in 1850 for the poplar trees that lined San Ramon Creek.
Today the town is an enclave of green with many homes on lots of 0.5 acres between Walnut Creek and Danville. It is governed by the County Board of Supervisors, with the AIA and several active county service areas advising on police, landscape and park issues. It has a number of distinguished residents.