Summerlin South, also seen on maps as South Summerlin, is a census-designated place (CDP) in Clark County, Nevada, United States, on the western edge of Las Vegas and adjacent to the Red Rock Canyon National Conservation Area. It is so named because it is a southward extension of the master-planned community of Summerlin. The population was 24,085 at the 2010 Census. Largely undeveloped, the community is officially governed by the Clark County Commission. Part of the empty land is Blue Diamond Hill, the current site of a gypsum mine which was bought to be developed into a large housing development facing Red Rock. However, public opposition by the residents of Blue Diamond and other area residents, joined by Nevada Senator Harry Reid, has so far blocked the project. The Summerlin South Community Association is the main governmental entity of the area – it is a homeowners association for the entire community. It is the only unincorporated area of the Las Vegas Valley that does not have a town advisory board.