Sun Valley is a small city in Lamar County, Texas, United States. The population was 51 at the 2000 census.GeographySun Valley is located at .According to the United States Census Bureau, the city has a total area of 0.2sqmi, all land.DemographicsAs of the census of 2000, there were 51 people, 18 households, and 14 families residing in the city. The population density was 332.0 people per square mile (131.3/km²). There were 31 housing units at an average density of 201.8/sq mi (79.8/km²). The racial makeup of the city was 86.27% White, 13.73% from other races. Hispanic or Latino of any race were 15.69% of the population.There were 18 households out of which 50.0% had children under the age of 18 living with them, 61.1% were married couples living together, 11.1% had a female householder with no husband present, and 16.7% were non-families. 16.7% of all households were made up of individuals and 5.6% had someone living alone who was 65 years of age or older. The average household size was 2.83 and the average family size was 3.07.In the city, the population was spread out with 25.5% under the age of 18, 15.7% from 18 to 24, 27.5% from 25 to 44, 27.5% from 45 to 64, and 3.9% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 121.7 males. For every 100 females age 18 and over, there were 100.0 males.
