East Valley is a census-designated place in Douglas County, Nevada, United States. The population was 1,474 at the 2010 census. East Valley is located directly east of Gardnerville on the east side of the Carson Valley in western Nevada. According to the United States Census Bureau, the CDP has a total area of 9.5 square miles, of which 9.4 square mil…East Valley is a census-designated place in Douglas County, Nevada, United States. The population was 1,474 at the 2010 census. East Valley is located directly east of Gardnerville on the east side of the Carson Valley in western Nevada. According to the United States Census Bureau, the CDP has a total area of 9.5 square miles, of which 9.4 square miles is land and 0.12 square miles, or 1.29%, is water.