2020 census As of the
2020 census, San Luis had a population of 35,257. The median age was 31.7 years. 27.6% of residents were under the age of 18 and 7.5% of residents were 65 years of age or older. For every 100 females there were 126.7 males, and for every 100 females age 18 and over there were 136.4 males age 18 and over. There were 7,685 households in San Luis, of which 60.8% had children under the age of 18 living in them. Of all households, 63.7% were married-couple households, 9.3% were households with a male householder and no spouse or partner present, and 22.8% were households with a female householder and no spouse or partner present. About 7.5% of all households were made up of individuals and 3.1% had someone living alone who was 65 years of age or older. There were 7,966 housing units, of which 3.5% were vacant. The homeowner vacancy rate was 0.3% and the rental vacancy rate was 3.5%.
2000 census As of the
census of 2000, there were 15,322 people, 6,525 households and 2,876 families residing in the city. The
population density was 796.3 people per square mile. There were 3,325 housing units at an average density of . The racial makeup of the city was 63.2
White, 0.3%
Black or
African American, 1.5%
Native American, 0.2%
Asian, and 2.8% from two or more races. 98.7% of the population were
Hispanic or
Latino of any race. There were 5,953 households, out of which 71.5% had children under the age of 18 living with them, 72.1% were
married couples living together, 19.8% had a female householder with no husband present and 7.1% were non-families. 3.9% of all households were made up of individuals, and 5.7% had someone living alone who was 65 years of age or older. The average household size was 4.20 and the average family size was 4.33. In the city, the population was spread out, with 35.6% under the age of 18, 12.9% from 18 to 24, 34.1% from 25 to 44, 13.4% from 45 to 64, and 4.0% who were 65 years of age or older. The median age was 26 years. For every 100 females, there were 126.5 males. For every 100 females age 18 and over, there were 144.6 males. The median income for a household in the city was $30,637 and the median income for a family was $22,368. Males had a median income of $20,770 versus $14,149 for females. The
per capita income for the city was $5,377. About 36.3% of families and 35.8% of the population were below the
poverty line, including 38.5% of those under age 18 and 44.3% of those age 65 or over. ==Economy==