#1 Best Private Middle Schools in Middlesex County, NJ
St. Joseph Elementary School
Diocesan school · Grades Pre-K–8
The only Catholic school in Carteret
Carteret, NJ
A+Overall grade83 students7 students per teacher
2026 lists
Best Private Middle Schools in Middlesex County, NJ
Private schools in Middlesex County, NJ with middle-school grades and the highest overall grades. Top 23 of 23 schools.
#2 Best Private Middle Schools in Middlesex County, NJ
Holy Savior Academy
Diocesan school · Grades Pre-K–8
Smaller classes than 78% of Catholic schools in New Jersey
South Plainfield, NJ
A+Overall grade121 students9 students per teacher
#3 Best Private Middle Schools in Middlesex County, NJ
Timothy Christian School
Christian school (nondenominational) · Grades K–12
The only Christian school in Piscataway
Piscataway, NJ
A+Overall grade452 students10 students per teacher
#4 Best Private Middle Schools in Middlesex County, NJ
Noor-Ul-Iman School
Islamic school · Grades Pre-K–12
The largest of 21 private schools in New Jersey
Monmouth Junction, NJ
A+Overall grade527 students7 students per teacher
#5 Best Private Middle Schools in Middlesex County, NJ
Assumption Catholic School
Religious school · Grades Pre-K–8
Serving families in Perth Amboy since at least 2011
Perth Amboy, NJ
A+Overall grade171 students15 students per teacher
#6 Best Private Middle Schools in Middlesex County, NJ
Immaculate Conception School
Diocesan school · Grades Pre-K–8
Smaller classes than 87% of Catholic schools in New Jersey
Spotswood, NJ
A+Overall grade98 students9 students per teacher
#7 Best Private Middle Schools in Middlesex County, NJ
Darul Arqam School
Islamic school · Grades Pre-K–12
Serving families in South River since at least 2011
South River, NJ
A+Overall grade268 students8 students per teacher
#8 Best Private Middle Schools in Middlesex County, NJ
Wardlaw-Hartridge School
Independent school · Grades Pre-K–12
100% of graduates go to four-year colleges
Edison, NJ
A+Overall grade435 students7 students per teacher
#9 Best Private Middle Schools in Middlesex County, NJ
Overlake Preparatory Academy
Independent school · Grades 7–12
100% of graduates go to four-year colleges
Edison, NJ
A+Overall grade96 students6 students per teacher
#10 Best Private Middle Schools in Middlesex County, NJ
St. Helena School
Parish school · Grades Pre-K–8
The only Catholic school in Edison
Edison, NJ
A+Overall grade162 students12 students per teacher
#11 Best Private Middle Schools in Middlesex County, NJ
St. James Elementary School
Diocesan school · Grades Pre-K–8
The only Catholic school in Woodbridge
Woodbridge, NJ
AOverall grade131 students11 students per teacher
#12 Best Private Middle Schools in Middlesex County, NJ
Calvary Christian School
Christian school (nondenominational) · Grades Pre-K–12
The only Christian school in Old Bridge
Old Bridge, NJ
AOverall grade288 students9 students per teacher
#13 Best Private Middle Schools in Middlesex County, NJ
St. Stanislaus Kostka School
Parish school · Grades Pre-K–8
Smaller classes than 60% of Catholic schools in New Jersey
Sayreville, NJ
AOverall grade137 students11 students per teacher
#14 Best Private Middle Schools in Middlesex County, NJ
Rabbi Pesach Raymon Yeshiva
Jewish day school · Grades Pre-K–8
Smaller classes than 82% of Jewish day schools in New Jersey
Edison, NJ
A-Overall grade231 students6 students per teacher
#15 Best Private Middle Schools in Middlesex County, NJ
French American School of Princeton
Independent school · Grades Pre-K–8
Growing: enrollment up 41% since 2011–12
Princeton, NJ
A-Overall grade116 students8 students per teacher
#16 Best Private Middle Schools in Middlesex County, NJ
St. John Vianney School
Diocesan school · Grades Pre-K–8
Serving families in Colonia since at least 2011
Colonia, NJ
B+Overall grade247 students12 students per teacher
#17 Best Private Middle Schools in Middlesex County, NJ
Pillars Preparatory Academy
Islamic school · Grades Pre-K–12
Small classes: about 5 students per teacher
South River, NJ
B+Overall grade289 students5 students per teacher
#18 Best Private Middle Schools in Middlesex County, NJ
Wilberforce School
Christian school (nondenominational) · Grades Pre-K–12
100% of graduates go to four-year colleges
Princeton, NJ
B+Overall grade344 students18 students per teacher
#19 Best Private Middle Schools in Middlesex County, NJ
St. Thomas the Apostle School
Diocesan school · Grades Pre-K–8
The only Catholic school in Old Bridge
Old Bridge, NJ
BOverall grade326 students14 students per teacher
#20 Best Private Middle Schools in Middlesex County, NJ
Metuchen Christian Academy
Assembly of God school · Grades K–8
The only Christian school in Metuchen
Metuchen, NJ
BOverall grade135 students15 students per teacher
#21 Best Private Middle Schools in Middlesex County, NJ
St. Francis Cathedral School
Diocesan school · Grades Pre-K–8
One of 2 Catholic schools in Metuchen
Metuchen, NJ
BOverall grade391 students16 students per teacher
#22 Best Private Middle Schools in Middlesex County, NJ
St. Bartholomew School
Parish school · Grades Pre-K–8
The only Catholic school in East Brunswick
East Brunswick, NJ
BOverall grade401 students19 students per teacher
#23 Best Private Middle Schools in Middlesex County, NJ
Yeshiva Shaarei Tzion Boys'
Jewish day school · Grades K–8
The only Jewish school in Piscataway
Piscataway, NJ
B-Overall gradeAll boys200 students13 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.