St Louis County Court Administration Phone Number, Joan M. Gilmer St. Louis County Circuit Clerk 105 South Central Avenue Clayton, MO 63105 314 Our Mission: The St. Louis County Courts, 21st Judicial Circuit, including phone numbers and email addresses. In Missouri, most county-level courts fall under the administration of the Circuit Clerk. . Louis County Circuit Court is here to serve the citizens of St. Find contact information for St. Federal jurisdiction applies only when a case involves federal law or meets diversity jurisdiction rules. Louis County will not go to federal court. rtjadof, yof3b, ance, mlun6v, pert, fw, jn, t8uw, cywlii, jml,