Spring Valley is an unincorporated township and census designated place, in Clark County, Nevada, United States located two miles west of the Las Vegas Strip. The population was 117,390 at the 2000 census, and was estimated by the Clark County Comprehensive Planning Department to have a population of 175,581 as of July 1, 2006.. Spring Valley apartments for rent comparison page shows most up to date rent information on Spring Valley apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.