#1 Largest Private Schools in Mercer County, NJ
Princeton Day School
Independent school · Grades Pre-K–12
952 students
Princeton, NJ
A+Overall grade952 students7 students per teacher
2026 lists
Largest Private Schools in Mercer County, NJ
The private schools in Mercer County, NJ with the most students. Top 30 of 30 schools.
#2 Largest Private Schools in Mercer County, NJ
Notre Dame High School
Diocesan school · Grades 9–12
894 students
Lawrenceville, NJ
B+Overall grade894 students13 students per teacher
#3 Largest Private Schools in Mercer County, NJ
The Lawrenceville School
Independent school · Grades 9–12
802 students
Lawrenceville, NJ
AOverall grade802 students7 students per teacher
#4 Largest Private Schools in Mercer County, NJ
The Pennington School
Methodist school · Grades 6–12
537 students
Pennington, NJ
A+Overall grade537 students6 students per teacher
#5 Largest Private Schools in Mercer County, NJ
Peddie School
Alternative school · Grades 9–12
516 students
Hightstown, NJ
B+Overall grade516 students7 students per teacher
#6 Largest Private Schools in Mercer County, NJ
St. Gregory the Great Academy
Parish school · Grades Pre-K–8
410 students
Hamilton, NJ
B+Overall grade410 students10 students per teacher
#7 Largest Private Schools in Mercer County, NJ
Trenton Catholic Preparatory Academy-Upper
Independent Catholic school · Grades K–12
399 students
Hamilton, NJ
A+Overall grade399 students10 students per teacher
#8 Largest Private Schools in Mercer County, NJ
Stuart Country Day School of the Sacred Heart
Independent Catholic school · Grades Pre-K–12
283 students
Princeton, NJ
A+Overall gradeAll girls283 students4 students per teacher
#9 Largest Private Schools in Mercer County, NJ
St. Paul School of Princeton
Parish school · Grades Pre-K–8
245 students
Princeton, NJ
A+Overall grade245 students10 students per teacher
#10 Largest Private Schools in Mercer County, NJ
Trenton Catholic Preparatory Academy Lower School
Independent Catholic school · Grades Pre-K–8
226 students
Hamilton, NJ
A-Overall grade226 students14 students per teacher
#11 Largest Private Schools in Mercer County, NJ
Faith Christian Academy
Baptist school · Grades Pre-K–8
186 students
Hamilton, NJ
B-Overall grade186 students18 students per teacher
#12 Largest Private Schools in Mercer County, NJ
St. Ann Elementary School
Diocesan school · Grades Pre-K–8
177 students
Lawrenceville, NJ
A+Overall grade177 students11 students per teacher
#13 Largest Private Schools in Mercer County, NJ
Chapin School
Independent school · Grades Pre-K–8
171 students
Princeton, NJ
A+Overall grade171 students6 students per teacher
#14 Largest Private Schools in Mercer County, NJ
Our Lady of Sorrows School
Parish school · Grades Pre-K–8
168 students
Mercerville, NJ
A-Overall grade168 students12 students per teacher
#15 Largest Private Schools in Mercer County, NJ
St. Raphael School
Diocesan school · Grades Pre-K–8
138 students
Hamilton, NJ
A+Overall grade138 students9 students per teacher
#16 Largest Private Schools in Mercer County, NJ
Princeton International SCHL of Math and Science
Independent school · Grades 9–12
120 students
Princeton, NJ
B+Overall grade120 students6 students per teacher
#17 Largest Private Schools in Mercer County, NJ
Cambridge School
Special education school · Grades 1–12
113 students
Pennington, NJ
A-Overall grade113 students4 students per teacher
#18 Largest Private Schools in Mercer County, NJ
Scicore Academy
Independent school · Grades Pre-K–12
105 students
Hightstown, NJ
BOverall grade105 students10 students per teacher
#19 Largest Private Schools in Mercer County, NJ
Scicore Academy
Independent school · Grades Pre-K–12
105 students
Highstown, NJ
BOverall grade105 students10 students per teacher
#20 Largest Private Schools in Mercer County, NJ
Villa Victoria Lower School
Independent Catholic school · Grades 6–12
95 students
Trenton, NJ
A+Overall gradeAll girls95 students5 students per teacher
#21 Largest Private Schools in Mercer County, NJ
Villa Victoria Academy
Independent Catholic school · Grades 6–12
94 students
Ewing, NJ
A+Overall gradeAll girls94 students6 students per teacher
#22 Largest Private Schools in Mercer County, NJ
The Newgrange School
Special education school · Grades 1–12
83 students
Pennington, NJ
B+Overall grade83 students4 students per teacher
#23 Largest Private Schools in Mercer County, NJ
Princeton Friends School
Quaker (Friends) school · Grades Pre-K–8
82 students
Princeton, NJ
A+Overall grade82 students4 students per teacher
#24 Largest Private Schools in Mercer County, NJ
The Titusville Academy
Special education school · Grades 2–12
64 students
Titusville, NJ
AOverall grade64 students5 students per teacher
From official public records, updated October 2026.