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Clarkson Valley is a city in St. Louis County, Missouri, United States. The population was 2,632 at the 2010 census.
Clarkson Valley is located at 38°37′2″N 90°35′18″W (38.617353, -90.588218).
According to the United States Census Bureau, the city has a total area of 2.75 square miles (7.12 km2), of which 2.70 square miles (6.99 km2) is land and 0.05 square miles (0.13 km2) is water.
Clarkson Valley is an affluent St. Louis suburb.
As of the census of 2010, there were 2,632 people, 882 households, and 801 families living in the city. The population density was 974.8 inhabitants per square mile (376.4/km2). There were 913 housing units at an average density of 338.1 per square mile (130.5/km2). The racial makeup of the city was 92.9% White, 1.5% African American, 3.5% Asian, 0.2% Pacific Islander, 0.6% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 2.2% of the population.
There were 882 households, of which 40.8% had children under the age of 18 living with them, 85.3% were married couples living together, 3.3% had a female householder with no husband present, 2.3% had a male householder with no wife present, and 9.2% were non-families.