St. Louis County Municipal Court 82 Clarkson Wilson Ctr, Chesterfield, MO63017 St. Louis County Municipal Court is a part of the St. Louis County Government Center West, which is in the Clarkson…More Wilson Center in Chesterfield. When it is open, it holds court at 7pm regarding traffic and ordinance violations. The third Thursday at 6pm is for trials. Property maintenance and zoning violations are the fourth Thursday of the month. Judge Jess W. Ullom serves as Municipal Division Judge of the St. Louis County Municipal Court in Chesterfield.