Jennings is a city in St. Louis County, Missouri, United States. The population was 14,712 at the 2010 census.
Jennings is located at 38°43′16″N 90°15′41″W (38.721100, -90.261428). According to the United States Census Bureau, the city has a total area of 3.70 square miles (9.58 km²), all land.
As of the census of 2010, there were 14,712 people, 5,847 households, and 3,782 families residing in the city. The population density was 3,976.2 inhabitants per square mile (1,535.2/km²). There were 6,937 housing units at an average density of 1,874.9 per square mile (723.9/km²). The racial makeup of the city was 89.8% African American, 8.5% White, 0.1% Native American, 0.2% Asian, 0.2% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 0.6% of the population.
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