#1 Most Diverse Private Schools in St. Clair County, IL
Governor French Academy
Independent school · Grades Pre-K–12
Largest group: 49% of students
Belleville, IL
AOverall grade73 students7 students per teacher
2026 lists
Most Diverse Private Schools in St. Clair County, IL
Private schools in St. Clair County, IL with the most varied mix of students. Top 16 of 16 schools.
#2 Most Diverse Private Schools in St. Clair County, IL
Illinois Center for Autism
Special education school · Ungraded
Largest group: 54% of students
Fairview Heights, IL
BOverall grade125 students8 students per teacher
#3 Most Diverse Private Schools in St. Clair County, IL
Illinois Center for Autism
Special education school · Ungraded
Largest group: 54% of students
Fairview Heights, IL
BOverall grade125 students8 students per teacher
#4 Most Diverse Private Schools in St. Clair County, IL
Blessed Sacrament School
Parish school · Grades Pre-K–8
Largest group: 55% of students
Belleville, IL
A+Overall grade142 students10 students per teacher
#5 Most Diverse Private Schools in St. Clair County, IL
Our Lady Queen of Peace School
Parish school · Grades Pre-K–8
Largest group: 66% of students
Belleville, IL
A+Overall grade139 students12 students per teacher
#6 Most Diverse Private Schools in St. Clair County, IL
Althoff Catholic High School
Diocesan school · Grades 9–12
Largest group: 68% of students
Belleville, IL
AOverall grade335 students15 students per teacher
#7 Most Diverse Private Schools in St. Clair County, IL
Notre Dame Academy of Belleville
Parish school · Grades Pre-K–8
Largest group: 69% of students
Belleville, IL
BOverall grade67 students
#8 Most Diverse Private Schools in St. Clair County, IL
Zion Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
Largest group: 75% of students
Belleville, IL
BOverall grade256 students14 students per teacher
#9 Most Diverse Private Schools in St. Clair County, IL
Holy Trinity Catholic School
Parish school · Grades Pre-K–8
Largest group: 80% of students
Fairview Heights, IL
A+Overall grade204 students11 students per teacher
#10 Most Diverse Private Schools in St. Clair County, IL
First Baptist Academy
Baptist school · Grades K–12
Largest group: 85% of students
O'Fallon, IL
A-Overall grade310 students10 students per teacher
#11 Most Diverse Private Schools in St. Clair County, IL
St. Teresa Catholic School
Diocesan school · Grades Pre-K–8
Largest group: 87% of students
Belleville, IL
AOverall grade153 students11 students per teacher
#12 Most Diverse Private Schools in St. Clair County, IL
St. James Catholic School
Diocesan school · Grades Pre-K–8
Largest group: 90% of students
Millstadt, IL
AOverall grade81 students9 students per teacher
#13 Most Diverse Private Schools in St. Clair County, IL
Holy Childhood of Jesus School
Parish school · Grades Pre-K–8
Largest group: 93% of students
Mascoutah, IL
B+Overall grade132 students9 students per teacher
#14 Most Diverse Private Schools in St. Clair County, IL
Sister Thea Bowman
Diocesan school · Grades K–8
Largest group: 95% of students
East Saint Louis, IL
AOverall grade101 students9 students per teacher
#15 Most Diverse Private Schools in St. Clair County, IL
Unity Lutheran Christian Elementary School
Lutheran (Missouri Synod) school · Grades Pre-K–8
Largest group: 96% of students
East Saint Louis, IL
B+Overall grade112 students10 students per teacher
#16 Most Diverse Private Schools in St. Clair County, IL
St. John the Baptist School
Diocesan school · Grades Pre-K–8
Largest group: 98% of students
Smithton, IL
A-Overall grade64 students9 students per teacher
From official public records, updated October 2026.