Green Valley is a census-designated place located in the U.S. state of California. It is in Los Angeles County just a few miles northwest of the Bouquet Reservoir. It coordinates at 34°37′18″N 118°24′50″W. The elevation is 2,936 feet above sea level. As of the 2010 census data, it had a total population of 1,027. The population density was 80/sq mi.