Castlio Elementary School is located in St. Charles, MO and is one of 10 elementary schools in Francis Howell R-iii School District. It is a public school that serves 909 students in grades K-5. See Castlio Elementary School's test results
to learn more about school performance.
In 2011, Castlio Elementary School had 14 students for every full-time equivalent teacher. The Missouri average is 14 students per full-time equivalent teacher.