Florissant is a second-ring suburb of St. Louis, located in northern St. Louis County, Missouri, United States. Based on 2017 U.S. Census Bureau estimates, the city had a total population of 51,443, making it the 13th-largest city in Missouri.
According to the United States Census Bureau, the city has a total area of 12.87 square miles (33.33 km²), of which, 12.56 square miles (32.53 km²) is land and 0.31 square miles (0.80 km²) is water.
At the 2010 census, there were 52,158 people, 21,247 households and 13,800 families residing in the city. The population density was 4,152.7 inhabitants per square mile (1,603.4/km²). There were 22,632 housing units at an average density of 1,801.9 per square mile (695.7/km²). The racial makeup of the city was 69.3% White, 26.8% African American, 0.2% Native American, 0.8% Asian, 0.6% from other races, and 2.3% from two or more races. Hispanic or Latino people of any race were 2.0% of the population.
There were 21,247 households of which 32.3% had children under the age of 18 living with them, 42.4% were married couples living together, 17.5% had a female householder with no husband present, 5.1% had a male householder with no wife present, and 35.0% were non-families. 29.9% of all households were made up of individuals and 12.2% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 3.00.
The median age in the city was 38 years. 23.9% of residents were under the age of 18; 8.6% were between the ages of 18 and 24; 26.2% were from 25 to 44; 25.8% were from 45 to 64; and 15.5% were 65 years of age or older. The gender makeup of the city was 46.8% male and 53.2% female.
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