Racial and ethnic composition 2020 census As of the
2020 census, Flossmoor had a population of 9,704, with 3,527 households and 2,499 families residing in the village. The population density was . There were 3,702 housing units at an average density of . Of the 3,702 housing units, 4.7% were vacant. The homeowner vacancy rate was 2.4% and the rental vacancy rate was 7.9%. Of households, 34.9% had children under the age of 18 living in them. Of all households, 55.5% were married-couple households, 11.6% were households with a male householder and no spouse or partner present, and 29.7% were households with a female householder and no spouse or partner present. About 21.5% of all households were made up of individuals and 12.3% had someone living alone who was 65 years of age or older.
Income and poverty The median income for a household in the village was $107,271, and the median income for a family was $119,836. Males had a median income of $80,609 versus $57,873 for females. The
per capita income for the village was $56,195. About 4.0% of families and 10.0% of the population were below the
poverty line, including 10.2% of those under age 18 and 3.2% of those age 65 or over. ==Government==