#1 Best Private High Schools in Mercer County, NJ
The Pennington School
Methodist school · Grades 6–12
The only Christian school in Pennington
Pennington, NJ
A+Overall grade537 students6 students per teacher
2026 lists
Best Private High Schools in Mercer County, NJ
Private high schools in Mercer County, NJ with the highest overall grades. Top 10 of 10 schools.
#2 Best Private High Schools in Mercer County, NJ
Stuart Country Day School of the Sacred Heart
Independent Catholic school · Grades Pre-K–12
The only all-girls school in Princeton
Princeton, NJ
A+Overall gradeAll girls283 students4 students per teacher
#3 Best Private High Schools in Mercer County, NJ
Villa Victoria Academy
Independent Catholic school · Grades 6–12
Smaller classes than 90% of Catholic schools nationwide
Ewing, NJ
A+Overall gradeAll girls94 students6 students per teacher
#4 Best Private High Schools in Mercer County, NJ
Trenton Catholic Preparatory Academy-Upper
Independent Catholic school · Grades K–12
100% of graduates go to four-year colleges
Hamilton, NJ
A+Overall grade399 students10 students per teacher
#5 Best Private High Schools in Mercer County, NJ
Princeton Day School
Independent school · Grades Pre-K–12
One of the 3 largest independent schools in New Jersey
Princeton, NJ
A+Overall grade952 students7 students per teacher
#6 Best Private High Schools in Mercer County, NJ
Villa Victoria Lower School
Independent Catholic school · Grades 6–12
Smaller classes than 92% of Catholic schools nationwide
Trenton, NJ
A+Overall gradeAll girls95 students5 students per teacher
#7 Best Private High Schools in Mercer County, NJ
The Lawrenceville School
Independent school · Grades 9–12
The only independent school in Lawrenceville
Lawrenceville, NJ
AOverall grade802 students7 students per teacher
#8 Best Private High Schools in Mercer County, NJ
Notre Dame High School
Diocesan school · Grades 9–12
99% of graduates go to four-year colleges
Lawrenceville, NJ
B+Overall grade894 students13 students per teacher
#9 Best Private High Schools in Mercer County, NJ
Peddie School
Alternative school · Grades 9–12
Small classes: about 7 students per teacher
Hightstown, NJ
B+Overall grade516 students7 students per teacher
#10 Best Private High Schools in Mercer County, NJ
Princeton International SCHL of Math and Science
Independent school · Grades 9–12
100% of graduates go to four-year colleges
Princeton, NJ
B+Overall grade120 students6 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.