#1 Most Diverse Private Schools in Middlesex County, NJ
Holy Savior Academy
Diocesan school · Grades Pre-K–8
Largest group: 29% of students
South Plainfield, NJ
A+Overall grade121 students9 students per teacher
2026 lists
Most Diverse Private Schools in Middlesex County, NJ
Private schools in Middlesex County, NJ with the most varied mix of students. Top 27 of 27 schools.
#2 Most Diverse Private Schools in Middlesex County, NJ
Overlake Preparatory Academy
Independent school · Grades 7–12
Largest group: 30% of students
Edison, NJ
A+Overall grade96 students6 students per teacher
#3 Most Diverse Private Schools in Middlesex County, NJ
Timothy Christian School
Christian school (nondenominational) · Grades K–12
Largest group: 31% of students
Piscataway, NJ
A+Overall grade452 students10 students per teacher
#4 Most Diverse Private Schools in Middlesex County, NJ
St. Joseph Elementary School
Diocesan school · Grades Pre-K–8
Largest group: 41% of students
Carteret, NJ
A+Overall grade83 students7 students per teacher
#5 Most Diverse Private Schools in Middlesex County, NJ
Wilberforce School
Christian school (nondenominational) · Grades Pre-K–12
Largest group: 42% of students
Princeton, NJ
B+Overall grade344 students18 students per teacher
#6 Most Diverse Private Schools in Middlesex County, NJ
Lakeview School
Special education school · Ungraded
Largest group: 48% of students
Edison, NJ
A+Overall grade143 students6 students per teacher
#7 Most Diverse Private Schools in Middlesex County, NJ
Metuchen Christian Academy
Assembly of God school · Grades K–8
Largest group: 50% of students
Metuchen, NJ
BOverall grade135 students15 students per teacher
#8 Most Diverse Private Schools in Middlesex County, NJ
Wardlaw-Hartridge School
Independent school · Grades Pre-K–12
Largest group: 51% of students
Edison, NJ
A+Overall grade435 students7 students per teacher
#9 Most Diverse Private Schools in Middlesex County, NJ
Assumption Catholic School
Religious school · Grades Pre-K–8
Largest group: 51% of students
Perth Amboy, NJ
A+Overall grade171 students15 students per teacher
#10 Most Diverse Private Schools in Middlesex County, NJ
St. James Elementary School
Diocesan school · Grades Pre-K–8
Largest group: 51% of students
Woodbridge, NJ
AOverall grade131 students11 students per teacher
#11 Most Diverse Private Schools in Middlesex County, NJ
French American School of Princeton
Independent school · Grades Pre-K–8
Largest group: 53% of students
Princeton, NJ
A-Overall grade116 students8 students per teacher
#12 Most Diverse Private Schools in Middlesex County, NJ
Pillars Preparatory Academy
Islamic school · Grades Pre-K–12
Largest group: 55% of students
South River, NJ
B+Overall grade289 students5 students per teacher
#13 Most Diverse Private Schools in Middlesex County, NJ
Calvary Christian School
Christian school (nondenominational) · Grades Pre-K–12
Largest group: 55% of students
Old Bridge, NJ
AOverall grade288 students9 students per teacher
#14 Most Diverse Private Schools in Middlesex County, NJ
Darul Arqam School
Islamic school · Grades Pre-K–12
Largest group: 56% of students
South River, NJ
A+Overall grade268 students8 students per teacher
#15 Most Diverse Private Schools in Middlesex County, NJ
St. Francis Cathedral School
Diocesan school · Grades Pre-K–8
Largest group: 59% of students
Metuchen, NJ
BOverall grade391 students16 students per teacher
#16 Most Diverse Private Schools in Middlesex County, NJ
St. Bartholomew School
Parish school · Grades Pre-K–8
Largest group: 60% of students
East Brunswick, NJ
BOverall grade401 students19 students per teacher
#17 Most Diverse Private Schools in Middlesex County, NJ
St. Thomas the Apostle School
Diocesan school · Grades Pre-K–8
Largest group: 61% of students
Old Bridge, NJ
BOverall grade326 students14 students per teacher
#18 Most Diverse Private Schools in Middlesex County, NJ
St. Joseph High School
Independent Catholic school · Grades 9–12
Largest group: 67% of students
Metuchen, NJ
AOverall gradeAll boys571 students13 students per teacher
#19 Most Diverse Private Schools in Middlesex County, NJ
St. John Vianney School
Diocesan school · Grades Pre-K–8
Largest group: 68% of students
Colonia, NJ
B+Overall grade247 students12 students per teacher
#20 Most Diverse Private Schools in Middlesex County, NJ
St. Helena School
Parish school · Grades Pre-K–8
Largest group: 69% of students
Edison, NJ
A+Overall grade162 students12 students per teacher
#21 Most Diverse Private Schools in Middlesex County, NJ
Noor-Ul-Iman School
Islamic school · Grades Pre-K–12
Largest group: 70% of students
Monmouth Junction, NJ
A+Overall grade527 students7 students per teacher
#22 Most Diverse Private Schools in Middlesex County, NJ
St. Stanislaus Kostka School
Parish school · Grades Pre-K–8
Largest group: 70% of students
Sayreville, NJ
AOverall grade137 students11 students per teacher
#23 Most Diverse Private Schools in Middlesex County, NJ
Immaculate Conception School
Diocesan school · Grades Pre-K–8
Largest group: 84% of students
Spotswood, NJ
A+Overall grade98 students9 students per teacher
#24 Most Diverse Private Schools in Middlesex County, NJ
Little Flower Montessori School
Montessori school · Grades Pre-K–2
Largest group: 89% of students
Edison, NJ
BOverall grade92 students15 students per teacher
From official public records, updated October 2026.