2020 census As of the
2020 census, Leesylvania had a population of 21,193. The median age was 35.4 years. 25.4% of residents were under the age of 18 and 6.9% of residents were 65 years of age or older. For every 100 females there were 91.3 males, and for every 100 females age 18 and over there were 86.7 males age 18 and over. There were 7,419 households in Leesylvania, of which 39.0% had children under the age of 18 living in them. Of all households, 50.7% were married-couple households, 16.2% were households with a male householder and no spouse or partner present, and 27.8% were households with a female householder and no spouse or partner present. About 24.7% of all households were made up of individuals and 2.8% had someone living alone who was 65 years of age or older. ==Geography==