Leon Valley is a city in Bexar County, Texas, United States. It is an enclave on the northwest side of San Antonio and is part of the San Antonio-New Braunfels Metropolitan Statistical Area. The population was 10,151 at the 2010 census. Leon Valley is an independent municipality completely surrounded by the city of San Antonio.HistoryLeon Valley was developed in the 1950s. In 1952 residents filed a petition for incorporation as an independent city since the residents did not wish to be annexed by San Antonio. Leon Valley had a population of 536 in 1960. Sometime in the 1960s Leon Valley incorporated as a city. Its population grew to 1,960 in 1970. In 1990 it had 9,581 people.GeographyLeon Valley is located at . This is 3 miles southwest of the South Texas Medical Center, 8 miles west of Uptown San Antonio, and 10 miles northwest of Downtown San Antonio.According to the United States Census Bureau, the city has a total area of, all of it land.2010 DemographicsAs of the census of 2010, there were 10,151 people, 4,158 households, and 2,636 families residing in the city. The racial makeup of the city was 80.98% White, 3.98% African American, 0.57% Native American, 3.71% Asian, 0.19% Pacific Islander, 8.06% from other races, and 2.51% from two or more races. Hispanic or Latino of any race were 56.22% of the population.