Clayton Flag

Clayton

County Seat:
Yes
Area (mi²):
2.507
State:
Missouri

Clayton is a city located in St. Louis County, Missouri. Clayton has a 2026 population of 17,512. It is also the county seat of St. Louis County. Clayton is currently declining at a rate of -0.03% annually but its population has increased by 0.88% since the most recent census, which recorded a population of 17,359 in 2020.

17.5K
Total Population
6,985
Density (mi²)
-6 -0.03%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)