Cottleville is a city in St. Charles County, Missouri, United States. The population was 3,075 at the 2010 census. A post office called Cottleville has been in operation since 1843. The town site was laid out in 1839. It was named by Captain Lorenzo Cottle, an early settler and a veteran of the Black Hawk War and Seminole Wars.Cottleville is located at 38°45′7″N 90°39′12″W (38.751819, -90.653390). According to the United States Census Bureau, the city has a total area of 4.46 square miles (11.55 km2), all land.As of the census of 2010, there were 3,075 people, 1,020 households, and 847 families living in the city. The population density was 689.5 inhabitants per square mile (266.2/km2).
There were 1,145 housing units at an average density of 256.7 per square mile (99.1/km2). The racial makeup of the city was 92.7% White, 3.7% African American, 0.2% Native American, 1.5% Asian, 0.5% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 1.8% of the population. There were 1,020 households, of which 45.5% had children under the age of 18 living with them, 71.3% were married couples living together, 8.0% had a female householder with no husband present, 3.7% had a male householder with no wife present, and 17.0% were non-families. 13.3% of all households were made up of individuals, and 3.6% had someone living alone who was 65 years of age or older. The average household size was 3.01 and the average family size was 3.31.
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