Clayton is a city in and the county seat of St. Louis County, Missouri, United States, and borders the city of St. Louis. The population was 15,939 at the 2010 census. The city was organized in 1877 and is named after Ralph Clayton, who donated the land for the courthouse. The city is also known for its multiple skyscrapers in its business district.GeographyAccording to the United States Census Bureau, the city has a total area of 2.48sqmi, all of it land.CityscapeThe architecture of central Clayton reflects its economic activity and eras of growth. An impressive collection of mid-century Modernist low and high rise structures contrast with earlier mansions, stores and flats.DemographicsIn the St. Louis region, Clayton is well known for housing a wealthy and educated young professional, often dual-income population.2010 censusAs of the census of 2010, there were 15,939 people, 5,322 households, and 2,921 families residing in the city. The population density was 6427.0PD/sqmi. There were 6,321 housing units at an average density of 2548.8/sqmi. The racial makeup of the city was 78.0% White, 8.2% African American, 0.2% Native American, 10.8% Asian, 0.4% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 3.1% of the population.