#25 Largest Private Schools in Illinois
Rockford Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–12
695 students
Rockford, IL
BOverall grade695 students13 students per teacher
2026 lists
Largest Private Schools in Illinois
The private schools in Illinois with the most students. Top 50 of 797 schools.
#26 Largest Private Schools in Illinois
Lycee Francais De Chicago
Independent school · Grades Pre-K–12
687 students
Chicago, IL
A+Overall grade687 students6 students per teacher
#27 Largest Private Schools in Illinois
BR Rice High School
Independent Catholic school · Grades 9–12
658 students
Chicago, IL
BOverall gradeAll boys658 students16 students per teacher
#28 Largest Private Schools in Illinois
Arie Crown Hebrew Day School
Jewish day school · Grades Pre-K–8
656 students
Skokie, IL
B-Overall grade656 students7 students per teacher
#29 Largest Private Schools in Illinois
Wheaton Christian Grammar School
Christian school (nondenominational) · Grades K–8
646 students
Winfield, IL
BOverall grade646 students16 students per teacher
#30 Largest Private Schools in Illinois
British International School of Chicago South Loop
Independent school · Grades Pre-K–12
641 students
Chicago, IL
BOverall grade641 students9 students per teacher
#31 Largest Private Schools in Illinois
Rockford Christian Schools
Christian school (nondenominational) · Grades Pre-K–12
639 students
Rockford, IL
BOverall grade639 students13 students per teacher
#32 Largest Private Schools in Illinois
British International School of Chicago South Loop
Independent school · Grades Pre-K–12
638 students
Chicago, IL
BOverall grade638 students10 students per teacher
#33 Largest Private Schools in Illinois
Islamic Foundation School
Islamic school · Grades Pre-K–12
633 students
Villa Park, IL
B+Overall grade633 students14 students per teacher
#34 Largest Private Schools in Illinois
College Preparatory School of America
Islamic school · Grades Pre-K–12
602 students
Lombard, IL
A+Overall grade602 students13 students per teacher
#35 Largest Private Schools in Illinois
Joliet Catholic Academy
Independent Catholic school · Grades 9–12
598 students
Joliet, IL
BOverall grade598 students16 students per teacher
#36 Largest Private Schools in Illinois
St. Paul of the Cross School
Parish school · Grades Pre-K–8
596 students
Park Ridge, IL
BOverall grade596 students15 students per teacher
#37 Largest Private Schools in Illinois
St. John of the Cross Parish School
Diocesan school · Grades Pre-K–8
594 students
Western Springs, IL
B-Overall grade594 students17 students per teacher
#38 Largest Private Schools in Illinois
Maryville Christian School
Baptist school · Grades K–12
590 students
Maryville, IL
B-Overall grade590 students13 students per teacher
#39 Largest Private Schools in Illinois
Mount Carmel High School
Independent Catholic school · Grades 9–12
588 students
Chicago, IL
A+Overall gradeAll boys588 students11 students per teacher
#40 Largest Private Schools in Illinois
Boylan Catholic H. S.
Diocesan school · Grades 9–12
586 students
Rockford, IL
A+Overall grade586 students13 students per teacher
#41 Largest Private Schools in Illinois
Peoria Christian School
Christian school (nondenominational) · Grades Pre-K–12
576 students
Peoria, IL
B-Overall grade576 students12 students per teacher
#42 Largest Private Schools in Illinois
Christian Liberty Academy
Calvinist school · Grades Pre-K–12
561 students
Arlington Heights, IL
B-Overall grade561 students22 students per teacher
#43 Largest Private Schools in Illinois
Sacred Heart Schools
Independent Catholic school · Grades Pre-K–8
556 students
Chicago, IL
A+Overall grade556 students10 students per teacher
#44 Largest Private Schools in Illinois
Sacred Heart Schools
Independent Catholic school · Grades Pre-K–8
556 students
Chicago, IL
AOverall grade556 students10 students per teacher
#45 Largest Private Schools in Illinois
St. Benedict Preparatory School
Diocesan school · Grades Pre-K–8
550 students
Chicago, IL
AOverall grade550 students11 students per teacher
#46 Largest Private Schools in Illinois
Yeshivas Tiferes Tzvi
Jewish day school · Grades K–8
550 students
Chicago, IL
B-Overall gradeAll boys550 students10 students per teacher
#47 Largest Private Schools in Illinois
St. James School
Diocesan school · Grades Pre-K–8
540 students
Arlington Heights, IL
B-Overall grade540 students16 students per teacher
#48 Largest Private Schools in Illinois
Cristo Rey Jesuit High School
Independent Catholic school · Grades 9–12
537 students
Chicago, IL
B-Overall grade537 students17 students per teacher
From official public records, updated October 2026.