#1 Private Schools with the Smallest Classes in Saint Charles, MO
St. John Paul II Preparatory
Independent Catholic school · Grades Pre-K–12
7 students per teacher
Saint Charles, MO
B-Overall grade176 students7 students per teacher
2026 lists
Private Schools with the Smallest Classes in Saint Charles, MO
Private schools in Saint Charles, MO with the fewest students per teacher (not counting preschools and special education schools). Top 9 of 9 schools.
#2 Private Schools with the Smallest Classes in Saint Charles, MO
Duchesne High School
Diocesan school · Grades 9–12
8.2 students per teacher
Saint Charles, MO
A+Overall grade225 students8 students per teacher
#3 Private Schools with the Smallest Classes in Saint Charles, MO
St. Cletus School
Parish school · Grades Pre-K–8
9.5 students per teacher
Saint Charles, MO
A+Overall grade176 students10 students per teacher
#4 Private Schools with the Smallest Classes in Saint Charles, MO
Academy of the Sacred Heart
Independent Catholic school · Grades Pre-K–8
9.9 students per teacher
Saint Charles, MO
A+Overall grade164 students10 students per teacher
#5 Private Schools with the Smallest Classes in Saint Charles, MO
Sts. Joachim & Ann School
Parish school · Grades Pre-K–8
11.9 students per teacher
Saint Charles, MO
BOverall grade155 students12 students per teacher
#6 Private Schools with the Smallest Classes in Saint Charles, MO
Immanuel Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
12.8 students per teacher
Saint Charles, MO
B-Overall grade366 students13 students per teacher
#7 Private Schools with the Smallest Classes in Saint Charles, MO
Seton Regional Catholic School
Parish school · Grades Pre-K–8
16.4 students per teacher
Saint Charles, MO
BOverall grade248 students16 students per teacher
#8 Private Schools with the Smallest Classes in Saint Charles, MO
Zion Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
18.3 students per teacher
Saint Charles, MO
B-Overall grade364 students18 students per teacher
#9 Private Schools with the Smallest Classes in Saint Charles, MO
St. Joseph School
Parish school · Grades Pre-K–8
19.8 students per teacher
Saint Charles, MO
B-Overall grade891 students20 students per teacher
From official public records, updated October 2026.