Racial and ethnic composition 2020 census As of the
2020 census, Manassas Park had a population of 17,219. The median age was 33.2 years. 26.2% of residents were under the age of 18 and 7.8% of residents were 65 years of age or older. For every 100 females there were 99.4 males, and for every 100 females age 18 and over there were 98.3 males age 18 and over. There were 5,381 households in Manassas Park, of which 43.9% had children under the age of 18 living in them. Of all households, 48.5% were married-couple households, 18.9% were households with a male householder and no spouse or partner present, and 25.0% were households with a female householder and no spouse or partner present. About 22.2% of all households were made up of individuals and 5.1% had someone living alone who was 65 years of age or older. Of the 3,254 households 45.4% had children under the age of 18 living with them, 59.9% were married couples living together, 12.1% had a female householder with no husband present, and 21.4% were non-families. 14.4% of households were one person and 2.6% were one person aged 65 or older. The average household size was 3.16 and the average family size was 3.47. The age distribution was 31.0% under the age of 18, 8.7% from 18 to 24, 40.1% from 25 to 44, 15.9% from 45 to 64, and 4.3% 65 or older. The median age was 30 years. For every 100 females, there were 103.8 males. For every 100 females age 18 and over, there were 103.0 males. The median household income was $60,794 and the median family income was $61,075. Males had a median income of $38,643 versus $30,942 for females. The per capita income for the city was $21,048. About 4.7% of families and 5.2% of the population were below the
poverty line, including 5.8% of those under age 18 and 11.2% of those age 65 or over. In June 2021,
U.S. News & World Report ranked Manassas Park with the fifth best life expectancy in the United States at 92.5 years old. ==Education==