#1 Largest Private Schools in Marion County, IN
Heritage Christian School
Christian school (nondenominational) · Grades Pre-K–12
1,476 students
Indianapolis, IN
A-Overall grade1,476 students12 students per teacher
2026 lists
Largest Private Schools in Marion County, IN
The private schools in Marion County, IN with the most students. Top 50 of 75 schools.
#2 Largest Private Schools in Marion County, IN
Cathedral High School
Parish school · Grades Pre-K–12
1,171 students
Indianapolis, IN
A+Overall grade1,171 students13 students per teacher
#3 Largest Private Schools in Marion County, IN
Roncalli High School
Diocesan school · Grades 9–12
1,082 students
Indianapolis, IN
BOverall grade1,082 students14 students per teacher
#4 Largest Private Schools in Marion County, IN
The Oaks Academy
Christian school (nondenominational) · Grades Pre-K–8
971 students
Indianapolis, IN
A+Overall grade971 students8 students per teacher
#5 Largest Private Schools in Marion County, IN
Park Tudor School
Alternative school · Grades Pre-K–12
956 students
Indianapolis, IN
B+Overall grade956 students10 students per teacher
#6 Largest Private Schools in Marion County, IN
Brebeuf Jesuit Preparatory School
Independent Catholic school · Grades 9–12
829 students
Indianapolis, IN
A+Overall grade829 students11 students per teacher
#7 Largest Private Schools in Marion County, IN
Suburban Christian School
Baptist school · Grades Pre-K–12
600 students
Indianapolis, IN
B-Overall grade600 students18 students per teacher
#8 Largest Private Schools in Marion County, IN
St. Simon the Apostle School
Diocesan school · Grades Pre-K–8
592 students
Indianapolis, IN
B+Overall grade592 students14 students per teacher
#9 Largest Private Schools in Marion County, IN
Cardinal Ritter High School
Diocesan school · Grades 7–12
585 students
Indianapolis, IN
B+Overall grade585 students14 students per teacher
#10 Largest Private Schools in Marion County, IN
St. Jude Catholic School
Diocesan school · Grades Pre-K–8
480 students
Indianapolis, IN
BOverall grade480 students17 students per teacher
#11 Largest Private Schools in Marion County, IN
St. Mark Catholic School
Diocesan school · Grades Pre-K–8
459 students
Indianapolis, IN
BOverall grade459 students19 students per teacher
#12 Largest Private Schools in Marion County, IN
Scecina Memorial High School
Diocesan school · Grades 9–12
454 students
Indianapolis, IN
A+Overall grade454 students12 students per teacher
#13 Largest Private Schools in Marion County, IN
St. Barnabas School
Parish school · Grades Pre-K–8
450 students
Indianapolis, IN
A+Overall grade450 students12 students per teacher
#14 Largest Private Schools in Marion County, IN
The Orchard School
Montessori school · Grades Pre-K–8
444 students
Indianapolis, IN
A+Overall grade444 students5 students per teacher
#15 Largest Private Schools in Marion County, IN
Indianapolis Christian School
Christian school (nondenominational) · Grades Pre-K–8
423 students
Indianapolis, IN
B+Overall grade423 students13 students per teacher
#16 Largest Private Schools in Marion County, IN
International School of Indiana
Independent school · Grades Pre-K–12
423 students
Indianapolis, IN
A+Overall grade423 students5 students per teacher
#17 Largest Private Schools in Marion County, IN
School of Knowledge
Islamic school · Grades Pre-K–12
422 students
Indianapolis, IN
A+Overall grade422 students10 students per teacher
#18 Largest Private Schools in Marion County, IN
Immaculate Heart of Mary Catholic School
Parish school · Grades K–8
410 students
Indianapolis, IN
B-Overall grade410 students18 students per teacher
#19 Largest Private Schools in Marion County, IN
Holy Cross Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
391 students
Indianapolis, IN
B-Overall grade391 students
#20 Largest Private Schools in Marion County, IN
Nativity Catholic School
Independent Catholic school · Grades Pre-K–8
385 students
Indianapolis, IN
BOverall grade385 students18 students per teacher
#21 Largest Private Schools in Marion County, IN
Holy Spirit Catholic School
Independent Catholic school · Grades Pre-K–8
377 students
Indianapolis, IN
BOverall grade377 students18 students per teacher
#22 Largest Private Schools in Marion County, IN
Covenant Christian High School
Christian school (nondenominational) · Grades 9–12
377 students
Indianapolis, IN
BOverall grade377 students13 students per teacher
#23 Largest Private Schools in Marion County, IN
Sycamore School
Independent school · Grades Pre-K–8
366 students
Indianapolis, IN
A+Overall grade366 students7 students per teacher
#24 Largest Private Schools in Marion County, IN
Little Flower Catholic School
Parish school · Grades Pre-K–8
353 students
Indianapolis, IN
A+Overall grade353 students12 students per teacher
From official public records, updated October 2026.