#1 Private Schools with the Smallest Classes in St. Clair County, IL
St. Joseph Catholic School
Diocesan school · Grades Pre-K–8
5.1 students per teacher
Freeburg, IL
A+Overall grade46 students5 students per teacher
2026 lists
Private Schools with the Smallest Classes in St. Clair County, IL
Private schools in St. Clair County, IL with the fewest students per teacher (not counting preschools and special education schools). Top 16 of 16 schools.
#2 Private Schools with the Smallest Classes in St. Clair County, IL
Governor French Academy
Independent school · Grades Pre-K–12
6.6 students per teacher
Belleville, IL
AOverall grade73 students7 students per teacher
#3 Private Schools with the Smallest Classes in St. Clair County, IL
St. James Catholic School
Diocesan school · Grades Pre-K–8
8.5 students per teacher
Millstadt, IL
AOverall grade81 students9 students per teacher
#4 Private Schools with the Smallest Classes in St. Clair County, IL
St. John the Baptist School
Diocesan school · Grades Pre-K–8
8.6 students per teacher
Smithton, IL
A-Overall grade64 students9 students per teacher
#5 Private Schools with the Smallest Classes in St. Clair County, IL
Sister Thea Bowman
Diocesan school · Grades K–8
8.7 students per teacher
East Saint Louis, IL
AOverall grade101 students9 students per teacher
#6 Private Schools with the Smallest Classes in St. Clair County, IL
Holy Childhood of Jesus School
Parish school · Grades Pre-K–8
9.4 students per teacher
Mascoutah, IL
B+Overall grade132 students9 students per teacher
#7 Private Schools with the Smallest Classes in St. Clair County, IL
First Baptist Academy
Baptist school · Grades K–12
9.7 students per teacher
O'Fallon, IL
A-Overall grade310 students10 students per teacher
#8 Private Schools with the Smallest Classes in St. Clair County, IL
Blessed Sacrament School
Parish school · Grades Pre-K–8
9.9 students per teacher
Belleville, IL
A+Overall grade142 students10 students per teacher
#9 Private Schools with the Smallest Classes in St. Clair County, IL
Asp2 STEAM Academy
Alternative school · Grades Pre-K–3
10 students per teacher
Belleville, IL
B+Overall grade40 students10 students per teacher
#10 Private Schools with the Smallest Classes in St. Clair County, IL
Unity Lutheran Christian Elementary School
Lutheran (Missouri Synod) school · Grades Pre-K–8
10.2 students per teacher
East Saint Louis, IL
B+Overall grade112 students10 students per teacher
#11 Private Schools with the Smallest Classes in St. Clair County, IL
Holy Trinity Catholic School
Parish school · Grades Pre-K–8
10.7 students per teacher
Fairview Heights, IL
A+Overall grade204 students11 students per teacher
#12 Private Schools with the Smallest Classes in St. Clair County, IL
St. Teresa Catholic School
Diocesan school · Grades Pre-K–8
11.4 students per teacher
Belleville, IL
AOverall grade153 students11 students per teacher
#13 Private Schools with the Smallest Classes in St. Clair County, IL
Our Lady Queen of Peace School
Parish school · Grades Pre-K–8
12.2 students per teacher
Belleville, IL
A+Overall grade139 students12 students per teacher
#14 Private Schools with the Smallest Classes in St. Clair County, IL
Zion Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
13.9 students per teacher
Belleville, IL
BOverall grade256 students14 students per teacher
#15 Private Schools with the Smallest Classes in St. Clair County, IL
Althoff Catholic High School
Diocesan school · Grades 9–12
15 students per teacher
Belleville, IL
AOverall grade335 students15 students per teacher
#16 Private Schools with the Smallest Classes in St. Clair County, IL
Notre Dame Academy of Belleville
Parish school · Grades Pre-K–8
67 students per teacher
Belleville, IL
BOverall grade67 students
From official public records, updated October 2026.