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.
San Ramon is home to the headquarters of the Chevron Corporation, 24-Hour Fitness, the West Coast headquarters of AT&T Inc., The Global Software Center of GE, as well as the San Ramon Medical Center. Major annual events include the Art and Wind Festival on Memorial Day weekend, the Fourth of July Picnic and Fireworks Show, and the Primo's Run for Education in October. The city is also home to California High School, founded in 1973 and ranked 250th best high school in the United States by Newsweek.
On April 24, 2001, San Ramon received the title Tree City USA.