San Ramon (Spanish: San Ramón; meaning Saint Raymond) is a city in Contra Costa County, California, United States. It is a suburban city of the San Francisco Bay Area, and lies in the San Ramon Valley. San Ramon's population was 72,148 as of the 2010 U.S. Census, with an estimated population of 74,378 in 2012, making it 4th largest city in Contra Costa County, behind Richmond, Concord and  Antioch.