#1 Best Catholic Schools in St. Clair County, IL
Blessed Sacrament School
Parish school · Grades Pre-K–8
The smallest classes of any Catholic school in Belleville
Belleville, IL
A+Overall grade142 students10 students per teacher
2026 lists
Best Catholic Schools in St. Clair County, IL
The highest-graded schools of this kind in St. Clair County, IL. Top 10 of 10 schools.
#2 Best Catholic Schools in St. Clair County, IL
Holy Trinity Catholic School
Parish school · Grades Pre-K–8
The only Catholic school in Fairview Heights
Fairview Heights, IL
A+Overall grade204 students11 students per teacher
#3 Best Catholic Schools in St. Clair County, IL
Our Lady Queen of Peace School
Parish school · Grades Pre-K–8
Serving families in Belleville since at least 2011
Belleville, IL
A+Overall grade139 students12 students per teacher
#4 Best Catholic Schools in St. Clair County, IL
St. Teresa Catholic School
Diocesan school · Grades Pre-K–8
Smaller classes than 61% of Catholic schools in Illinois
Belleville, IL
AOverall grade153 students11 students per teacher
#5 Best Catholic Schools in St. Clair County, IL
Althoff Catholic High School
Diocesan school · Grades 9–12
The largest Catholic school in Belleville
Belleville, IL
AOverall grade335 students15 students per teacher
#6 Best Catholic Schools in St. Clair County, IL
Sister Thea Bowman
Diocesan school · Grades K–8
Smaller classes than 84% of Catholic schools in Illinois
East Saint Louis, IL
AOverall grade101 students9 students per teacher
#7 Best Catholic Schools in St. Clair County, IL
St. James Catholic School
Diocesan school · Grades Pre-K–8
Smaller classes than 86% of Catholic schools in Illinois
Millstadt, IL
AOverall grade81 students9 students per teacher
#8 Best Catholic Schools in St. Clair County, IL
St. John the Baptist School
Diocesan school · Grades Pre-K–8
Smaller classes than 85% of Catholic schools in Illinois
Smithton, IL
A-Overall grade64 students9 students per teacher
#9 Best Catholic Schools in St. Clair County, IL
Holy Childhood of Jesus School
Parish school · Grades Pre-K–8
Smaller classes than 80% of Catholic schools in Illinois
Mascoutah, IL
B+Overall grade132 students9 students per teacher
#10 Best Catholic Schools in St. Clair County, IL
Notre Dame Academy of Belleville
Parish school · Grades Pre-K–8
One of 5 Catholic schools in Belleville
Belleville, IL
BOverall grade67 students
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.