what is the sales tax in clayton, mo.
Clayton, MO Sales Tax Rate. The current total local sales tax rate in Clayton, MO is 8.613%. The December 2016 total local sales tax rate was also 8.613%. Clayton, MO is in Saint Louis County. Follow @SaleTaxCom. Sale-Tax.com strives to have the most accurate tax percentages available but tax rates are subject to change at any time.