37°45′N 121°57′W / 37.75°N 121.95°W[1] The San Ramon Valley is a valley and region in Contra Costa County and Alameda County, in the East Bay region of the San Francisco Bay Area in northern California.
37°45′N 121°57′W / 37.75°N 121.95°W[1] The San Ramon Valley is a valley and region in Contra Costa County and Alameda County, in the East Bay region of the San Francisco Bay Area in northern California.