Clayton, MO Insights: Population,
Zip Codes, Influence, and Service Areas

Clayton is a city in and the county seat of St. Louis County, Missouri, and borders the independent city of St. Louis. The population was 17,355 at the 2020 census. Organized in 1877, the city was named after Ralph Clayton, who donated the land for the St. Louis County courthouse.

Zip Codes in Clayton, MO that we also serve: 63105 63195 63199





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