#1 Largest Private Schools in Missouri
Greenways Academy
Alternative school · Grades 1–12
3,015 students
Saint Louis, MO
BOverall grade3,015 students
2026 lists
Largest Private Schools in Missouri
The private schools in Missouri with the most students. Top 50 of 446 schools.
#2 Largest Private Schools in Missouri
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 Missouri
Summit Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
1,135 students
Lees Summit, MO
B-Overall grade1,135 students13 students per teacher
#4 Largest Private Schools in Missouri
St. Dominic High School
Diocesan school · Grades 9–12
1,087 students
O'Fallon, MO
B-Overall grade1,087 students17 students per teacher
#5 Largest Private Schools in Missouri
The Pembroke Hill School - Wornall Campus
Independent school · Grades Pre-K–12
1,045 students
Kansas City, MO
B+Overall grade1,045 students10 students per teacher
#6 Largest Private Schools in Missouri
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
#7 Largest Private Schools in Missouri
Westminster Christian Academy
Presbyterian school · Grades 7–12
940 students
Town and Country, MO
AOverall grade940 students11 students per teacher
#8 Largest Private Schools in Missouri
St. Joseph School
Parish school · Grades Pre-K–8
891 students
Saint Charles, MO
B-Overall grade891 students20 students per teacher
#9 Largest Private Schools in Missouri
Rockhurst High School
Independent Catholic school · Grades 9–12
888 students
Kansas City, MO
BOverall gradeAll boys888 students13 students per teacher
#10 Largest Private Schools in Missouri
Chaminade College Preparatory School
Independent Catholic school · Grades 6–12
872 students
Saint Louis, MO
B+Overall gradeAll boys872 students10 students per teacher
#11 Largest Private Schools in Missouri
Gloria Deo
Christian school (nondenominational) · Grades Pre-K–12
833 students
Springfield, MO
B-Overall grade833 students10 students per teacher
#12 Largest Private Schools in Missouri
Immaculate Conception School
Parish school · Grades Pre-K–8
715 students
Dardenne Prairie, MO
B-Overall grade715 students19 students per teacher
#13 Largest Private Schools in Missouri
The Barstow School
Independent school · Grades Pre-K–12
714 students
Kansas City, MO
B+Overall grade714 students12 students per teacher
#14 Largest Private Schools in Missouri
Helias Catholic High School
Diocesan school · Grades 9–12
680 students
Jefferson City, MO
B-Overall grade680 students19 students per teacher
#15 Largest Private Schools in Missouri
Our Lady of Lourdes Interparish School
Diocesan school · Grades K–8
628 students
Columbia, MO
BOverall grade628 students15 students per teacher
#16 Largest Private Schools in Missouri
St. Therese School
Diocesan school · Grades K–8
604 students
Kansas City, MO
A+Overall grade604 students9 students per teacher
#17 Largest Private Schools in Missouri
Christian School District
Christian school (nondenominational) · Grades Pre-K–12
596 students
O'Fallon, MO
B-Overall grade596 students13 students per teacher
#18 Largest Private Schools in Missouri
Christian School District
Christian school (nondenominational) · Grades Pre-K–12
596 students
O'Fallon, MO
B-Overall grade596 students12 students per teacher
#19 Largest Private Schools in Missouri
St. Joseph's Academy
Independent Catholic school · Grades 9–12
587 students
Saint Louis, MO
BOverall gradeAll girls587 students12 students per teacher
#20 Largest Private Schools in Missouri
St. John Vianney High School
Independent Catholic school · Grades 9–12
581 students
Kirkwood, MO
A-Overall gradeAll boys581 students12 students per teacher
#21 Largest Private Schools in Missouri
College Heights Christian School
Christian school (nondenominational) · Grades Pre-K–12
571 students
Joplin, MO
B-Overall grade571 students12 students per teacher
#22 Largest Private Schools in Missouri
St. Teresa's Academy
Independent Catholic school · Grades 9–12
570 students
Kansas City, MO
A+Overall gradeAll girls570 students11 students per teacher
#23 Largest Private Schools in Missouri
Visitation Academy
Independent Catholic school · Grades Pre-K–12
555 students
Saint Louis, MO
AOverall gradeAll girls555 students9 students per teacher
#24 Largest Private Schools in Missouri
Lutheran High School South
Lutheran (Missouri Synod) school · Grades 9–12
550 students
Saint Louis, MO
BOverall grade550 students13 students per teacher
From official public records, updated October 2026.