The City of Lake St. Louis is a planned community situated around two lakes between Interstate 70 and Interstate 64 in western St. Charles County, Missouri, United States. The population was 14,545 as of the 2010 US Census. Lake St. Louis is a suburb of St. Louis.
Lake St. Louis is located at 38°47′8″N 90°47′1″W / 38.78556°N 90.78361°W / 38.78556; -90.78361 (38.785620, -90.783610). According to the United States Census Bureau, the city has a total area of 8.72 square miles (22.58 km), of which 7.91 square miles (20.49 km) is land and 0.81 square miles (2.10 km) is water.
As of the census of 2010, there were 14,545 people, 5,816 households, and 4,213 families residing in the city. The population density was 1,838.8 inhabitants per square mile (710.0/km). There were 6,197 housing units at an average density of 783.4 per square mile (302.5/km). The racial makeup of the city was 92.2% White, 3.8% African American, 0.3% Native American, 2.1% Asian, 0.1% Pacific Islander, 0.3% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 2.1% of the population.
There were 5,816 households of which 31.5% had children under the age of 18 living with them, 60.8% were married couples living together, 7.8% had a female householder with no husband present, 3.8% had a male householder with no wife present, and 27.6% were non-families. 22.2% of all households were made up of individuals and 7.4% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 2.94.
The median age in the city was 41.3 years. 23.4% of residents were under the age of 18; 7.1% were between the ages of 18 and 24; 24.6% were from 25 to 44; 29% were from 45 to 64; and 16% were 65 years of age or older. The gender makeup of the city was 49.5% male and 50.5% female.
Per the census of 2000,it is estimated there were 13,708 people, 3,923 households, and 3,005 families residing in the city. The population density was 1,359.3 people per square mile (524.9/km²). There were 4,133 housing units at an average density of 552.4 per square mile (213.3/km²). The racial makeup of the city was 95.60% White, 1.84% African American, 0.25% Native American, 0.97% Asian, 0.04% Pacific Islander, 0.40% from other races, and 0.89% from two or more races. Hispanic or Latino of any race were 1.35% of the population.
There were 3,923 households out of which 32.4% had children under the age of 18 living with them, 68.0% were married couples living together, 6.4% had a female householder with no husband present, and 23.4% were non-families. 18.5% of all households were made up of individuals and 4.9% had someone living alone who was 65 years of age or older. The average household size was 2.59 and the average family size was 2.97.
In the city, the population was spread out with 24.5% under the age of 18, 6.8% from 18 to 24, 27.3% from 25 to 44, 29.6% from 45 to 64, and 11.8% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 98.1 males. For every 100 females age 18 and over, there were 95.0 males.
The median income for a household in the city was $68,830, and the median income for a family was $80,700. Males had a median income of $57,201 versus $30,335 for females. The per capita income for the city was $32,064. About 2.1% of families and 3.9% of the population were below the poverty line, including 6.9% of those under age 18 and 4.5% of those age 65 or over.