#1 Best Private 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 Schools in Mercer County, NJ
Private schools in Mercer County, NJ with the highest overall grades. Top 21 of 21 schools.
#2 Best Private 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 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 Schools in Mercer County, NJ
St. Raphael School
Diocesan school · Grades Pre-K–8
The smallest classes of any Catholic school in Hamilton
Hamilton, NJ
A+Overall grade138 students9 students per teacher
#5 Best Private 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
#6 Best Private 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
#7 Best Private 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
#8 Best Private Schools in Mercer County, NJ
Princeton Friends School
Quaker (Friends) school · Grades Pre-K–8
Smaller classes than 89% of Christian schools in New Jersey
Princeton, NJ
A+Overall grade82 students4 students per teacher
#9 Best Private Schools in Mercer County, NJ
St. Ann Elementary School
Diocesan school · Grades Pre-K–8
Smaller classes than 60% of Catholic schools in New Jersey
Lawrenceville, NJ
A+Overall grade177 students11 students per teacher
#10 Best Private Schools in Mercer County, NJ
Chapin School
Independent school · Grades Pre-K–8
Small classes: about 6 students per teacher
Princeton, NJ
A+Overall grade171 students6 students per teacher
#11 Best Private Schools in Mercer County, NJ
St. Paul School of Princeton
Parish school · Grades Pre-K–8
Smaller classes than 68% of Catholic schools in New Jersey
Princeton, NJ
A+Overall grade245 students10 students per teacher
#12 Best Private 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
#13 Best Private Schools in Mercer County, NJ
Our Lady of Sorrows School
Parish school · Grades Pre-K–8
Serving families in Mercerville since at least 2011
Mercerville, NJ
A-Overall grade168 students12 students per teacher
#14 Best Private Schools in Mercer County, NJ
Trenton Catholic Preparatory Academy Lower School
Independent Catholic school · Grades Pre-K–8
Serving families in Hamilton since at least 2011
Hamilton, NJ
A-Overall grade226 students14 students per teacher
#15 Best Private 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
#16 Best Private Schools in Mercer County, NJ
St. Gregory the Great Academy
Parish school · Grades Pre-K–8
The largest Catholic school in Hamilton
Hamilton, NJ
B+Overall grade410 students10 students per teacher
#17 Best Private 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
#18 Best Private 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
#19 Best Private Schools in Mercer County, NJ
Scicore Academy
Independent school · Grades Pre-K–12
One school from pre-K through 12th grade
Hightstown, NJ
BOverall grade105 students10 students per teacher
#20 Best Private Schools in Mercer County, NJ
Scicore Academy
Independent school · Grades Pre-K–12
One school from pre-K through 12th grade
Highstown, NJ
BOverall grade105 students10 students per teacher
#21 Best Private Schools in Mercer County, NJ
Faith Christian Academy
Baptist school · Grades Pre-K–8
The only Christian school in Hamilton
Hamilton, NJ
B-Overall grade186 students18 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.