#1 Largest Private Schools in Saint Louis, MO
Greenways Academy
Alternative school · Grades 1–12
3,015 students
Saint Louis, MO
BOverall grade3,015 students
2026 lists
Largest Private Schools in Saint Louis, MO
The private schools in Saint Louis, MO with the most students. Top 50 of 83 schools.
#2 Largest Private Schools in Saint Louis, MO
Micds
Independent school · Grades Pre-K–12
1,220 students
Saint Louis, MO
A+Overall grade1,220 students9 students per teacher
#3 Largest Private Schools in Saint Louis, MO
St. Louis University High School
Independent Catholic school · Grades 9–12
1,036 students
Saint Louis, MO
AOverall gradeAll boys1,036 students12 students per teacher
#4 Largest Private Schools in Saint Louis, MO
Chaminade College Preparatory School
Independent Catholic school · Grades 6–12
872 students
Saint Louis, MO
B+Overall gradeAll boys872 students10 students per teacher
#5 Largest Private Schools in Saint Louis, MO
St. Joseph's Academy
Independent Catholic school · Grades 9–12
587 students
Saint Louis, MO
BOverall gradeAll girls587 students12 students per teacher
#6 Largest Private Schools in Saint Louis, MO
Visitation Academy
Independent Catholic school · Grades Pre-K–12
555 students
Saint Louis, MO
AOverall gradeAll girls555 students9 students per teacher
#7 Largest Private Schools in Saint Louis, MO
Lutheran High School South
Lutheran (Missouri Synod) school · Grades 9–12
550 students
Saint Louis, MO
BOverall grade550 students13 students per teacher
#8 Largest Private Schools in Saint Louis, MO
Cor Jesu Academy
Independent Catholic school · Grades 9–12
519 students
Saint Louis, MO
A+Overall gradeAll girls519 students11 students per teacher
#9 Largest Private Schools in Saint Louis, MO
St. Catherine Laboure School
Parish school · Grades K–8
482 students
Saint Louis, MO
BOverall grade482 students18 students per teacher
#10 Largest Private Schools in Saint Louis, MO
St. Gabriel the Archangel School
Parish school · Grades K–8
475 students
Saint Louis, MO
BOverall grade475 students15 students per teacher
#11 Largest Private Schools in Saint Louis, MO
Villa Duchesne Upper and Lower School
Independent Catholic school · Grades Pre-K–12
465 students
Saint Louis, MO
BOverall grade465 students9 students per teacher
#12 Largest Private Schools in Saint Louis, MO
Villa Duchesne School
Independent Catholic school · Grades Pre-K–12
459 students
Saint Louis, MO
A+Overall grade459 students4 students per teacher
#13 Largest Private Schools in Saint Louis, MO
Cardinal Ritter College Prep High School
Diocesan school · Grades 9–12
453 students
Saint Louis, MO
BOverall grade453 students13 students per teacher
#14 Largest Private Schools in Saint Louis, MO
Principia School
Religious school · Grades Pre-K–12
423 students
Saint Louis, MO
A+Overall grade423 students8 students per teacher
#15 Largest Private Schools in Saint Louis, MO
Whitfield School
Independent school · Grades 6–12
407 students
Saint Louis, MO
A+Overall grade407 students9 students per teacher
#16 Largest Private Schools in Saint Louis, MO
Holy Cross Academy
Parish school · Grades Pre-K–8
402 students
Saint Louis, MO
BOverall grade402 students13 students per teacher
#17 Largest Private Schools in Saint Louis, MO
St. Margaret Mary Alacoque School
Parish school · Grades Pre-K–8
397 students
Saint Louis, MO
B-Overall grade397 students17 students per teacher
#18 Largest Private Schools in Saint Louis, MO
St. Margaret of Scotland School
Parish school · Grades Pre-K–8
384 students
Saint Louis, MO
B-Overall grade384 students18 students per teacher
#19 Largest Private Schools in Saint Louis, MO
Ursuline Academy
Independent Catholic school · Grades 9–12
363 students
Saint Louis, MO
B+Overall gradeAll girls363 students12 students per teacher
#20 Largest Private Schools in Saint Louis, MO
Queen of All Saints School
Diocesan school · Grades Pre-K–8
356 students
Saint Louis, MO
B-Overall grade356 students15 students per teacher
#21 Largest Private Schools in Saint Louis, MO
Lutheran High School North
Lutheran (Missouri Synod) school · Grades 6–12
335 students
Saint Louis, MO
B-Overall grade335 students13 students per teacher
#22 Largest Private Schools in Saint Louis, MO
Community School
Independent school · Grades Pre-K–6
305 students
Saint Louis, MO
B+Overall grade305 students7 students per teacher
#23 Largest Private Schools in Saint Louis, MO
Lesanto's Healing Hands Learning Center
Special education school · Grades Pre-K–K
300 students
Saint Louis, MO
B-Overall grade300 students10 students per teacher
#24 Largest Private Schools in Saint Louis, MO
St. Louis Priory School
Independent Catholic school · Grades 7–12
299 students
Saint Louis, MO
A+Overall gradeAll boys299 students8 students per teacher
From official public records, updated October 2026.