Crystal Lake Park is a Missouri Class 4 city in St. Louis County, Missouri, United States. The population was 470 at the 2010 census.GeographyCrystal Lake Park is located at .According to the United States Census Bureau, the city has a total area of 0.11sqmi, all of it land.Demographics2010 censusAs of the census of 2010, there were 470 people, 202 households, and 136 families residing in the city. The population density was 4272.7PD/sqmi. There were 222 housing units at an average density of 2018.2/sqmi. The racial makeup of the city was 91.5% White, 2.8% African American, 4.7% Asian, 0.2% from other races, and 0.9% from two or more races. Hispanic or Latino of any race were 1.5% of the population.There were 202 households of which 29.7% had children under the age of 18 living with them, 57.9% were married couples living together, 7.4% had a female householder with no husband present, 2.0% had a male householder with no wife present, and 32.7% were non-families. 29.2% of all households were made up of individuals and 16.9% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.91.
