Leon Valley was developed in the 1940s as a farming community on Bandera Road between Helotes and San Antonio. 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 incorporated in 1954 under the leadership of its founding mayor, Raymond Rimkus. In 1960, it had a population of 536 and by 1970 Its population grew to 1,960. In 1990 it had 9,581 people.
At the 2010 census, there were 10,151 people, 4,158 households, and 2,636 families living 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. Of the 4,158 households 24.22% had children under the age of 18 living with them, 45.98% were married couples living together, 12.70% had a female householder with no husband present, and 36.60% were non-families. 29.89% of households were one person and 11.54% were one person aged 65 or older. The average household size was 2.44 and the average family size was 3.03. The age distribution was 23.09% under the age of 19, 6.82% from 20 to 24, 27.32% from 25 to 44, 25.85% from 45 to 64, and 16.92% 65 or older. The median age was 39.4 years. For every 100 females, there were 92.66 males. For every 100 females age 18 and over, there were 88.62 males
2000 Census
At the 2000 census there were 9,239 people, 3,576 households, and 2,521 families living in the city. The population density was 2,708.0 people per square mile. There were 3,672 housing units at an average density of 1,076.3 per square mile. The racial makeup of the city was 78.07% White, 2.77% African American, 0.67% Native American, 1.95% Asian, 0.15% Pacific Islander, 13.19% from other races, and 3.19% from two or more races. Hispanic or Latino of any race were 44.65%. Of the 3,576 households 29.7% had children under the age of 18 living with them, 56.0% were married couples living together, 11.0% had a female householder with no husband present, and 29.5% were non-families. 24.8% of households were one person and 8.3% were one person aged 65 or older. The average household size was 2.56 and the average family size was 3.07. The age distribution was 23.4% under the age of 18, 9.0% from 18 to 24, 28.1% from 25 to 44, 26.0% from 45 to 64, and 13.5% 65 or older. The median age was 38 years. For every 100 females, there were 94.9 males. For every 100 females age 18 and over, there were 90.3 males. The median household income was $49,079 and the median family income was $56,543. Males had a median income of $32,917 versus $28,700 for females. The per capita income for the city was $21,743. About 4.8% of families and 8.1% of the population were below the poverty line, including 12.6% of those under age 18 and 6.6% of those age 65 or over. The median home price for Leon Valley has appreciated every year since 2000. In 2005 the median home price in Leon Valley was $95,480.
