Clarkson Valley is a city in St. Louis County, Missouri, United States.

[5] Clarkson Valley is an affluent St. Louis suburb in the 63005 zip code.

There were 911 housing units at an average density of 337.4 per square mile (130.3/km2).

The average family size was 2.96% The median age in the city was 51.8 years.

There were 913 housing units at an average density of 338.1 per square mile (130.5/km2).

7.9% of all households were made up of individuals, and 4.4% had someone living alone who was 65 years of age or older.

6.0% of all households were made up of individuals, and 1.8% had someone living alone who was 65 years of age or older.

About 0.5% of families and 0.4% of the population were below the poverty line, including none of those under the age of eighteen or sixty-five or over.