a high school with Oak Park, known as Oak Park and River Forest High School, located in Oak Park. River Forest is home to two Catholic grade schools and one Lutheran grade school. St. Luke Parish and St. Vincent Ferrer School are Catholic schools, and Grace Lutheran School is Lutheran. All three enroll children from 3 years old through eighth grade. River Forest has one all-girls' secondary school, Trinity High School. River Forest also has the Keystone Montessori School, established in 1994. It serves children 9 months of age to 8th grade as an alternative learning style for children. It educates children using the philosophy of Maria Montessori. The River Forest Public Library is located at 735 Lathrop Avenue. Government and infrastructure The United States Postal Service operates the River Forest Post Office at 401 William Street. Demographics As of the 2020 census there were 11,717 people, 4,040 households, and 2,754 families residing in the village. The population density was . There were 4,266 housing units at an average density of . The racial makeup of the village was 72.91% White, 7.51% African American, 0.12% Native American, 8.01% Asian, 2.70% from other races, and 8.75% from two or more races. Hispanic or Latino of any race were 8.46% of the population. There were 4,040 households, out of which 67.30% had children under the age of 18 living with them, 60.69% were married couples living together, 4.80% had a female householder with no husband present, and 31.83% were non-families. 31.83% of all households were made up of individuals, and 15.32% had someone living alone who was 65 years of age or older. The average household size was 3.13 and the average family size was 2.47. The village's age distribution consisted of 25.4% under the age of 18, 10.5% from 18 to 24, 18.4% from 25 to 44, 28.3% from 45 to 64, and 17.3% who were 65 years of age or older. The median age was 40.8 years. For every 100 females, there were 95.4 males. For every 100 females age 18 and over, there were 92.5 males. The median income for a household in the village was $125,288, and the median income for a family was $193,171. Males had a median income of $116,643 versus $57,703 for females. The per capita income for the village was $79,929. About 1.3% of families and 2.2% of the population were below the poverty