This School is no longer MSHSAA Member School. School Colors & Logos Greyhounds Orange/Royal Blue boys girls Social Media Clayton-Greyhounds-1528833830686976 CHSGreyhounds CHSGreyhounds_ Membership Full Member High School, Grades 9-12 St. Louis County Board District: #7 St. Louis Contact Information 1 Mark Twain Circle Clayton, MO 63105-1613 (314) 854-6743 (314) 854-6742 fax Location 1 Mark Twain Circle Clayton, MO 63105-1613 (314) 854-6743 Get Directions