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Crystal Lake Park is a Missouri Class 4 city in St. Louis County, Missouri, United States. The population was 470 at the 2010 census.
Crystal Lake Park is located at 38°37′12″N 90°25′56″W (38.619989, -90.432321).
According to the United States Census Bureau, the city has a total area of 0.11 square miles (0.28 km2), all land.
At the 2010 census there were 470 people, 202 households, and 136 families living in the city. The population density was 4,272.7 inhabitants per square mile (1,649.7/km2). There were 222 housing units at an average density of 2,018.2 per square mile (779.2/km2). 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 202 households 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 households were one person and 16.9% were one person aged 65 or older. The average household size was 2.33 and the average family size was 2.91.
The median age was 47.9 years.