#1 Private Schools with the Smallest Classes in Mercer County, NJ
Princeton Friends School
Quaker (Friends) school · Grades Pre-K–8
4 students per teacher
Princeton, NJ
A+Overall grade82 students4 students per teacher
2026 lists
Private Schools with the Smallest Classes in Mercer County, NJ
Private schools in Mercer County, NJ with the fewest students per teacher (not counting preschools and special education schools). Top 22 of 22 schools.
#2 Private Schools with the Smallest Classes in Mercer County, NJ
Stuart Country Day School of the Sacred Heart
Independent Catholic school · Grades Pre-K–12
4.2 students per teacher
Princeton, NJ
A+Overall gradeAll girls283 students4 students per teacher
#3 Private Schools with the Smallest Classes in Mercer County, NJ
Villa Victoria Lower School
Independent Catholic school · Grades 6–12
5.2 students per teacher
Trenton, NJ
A+Overall gradeAll girls95 students5 students per teacher
#4 Private Schools with the Smallest Classes in Mercer County, NJ
The Pennington School
Methodist school · Grades 6–12
5.8 students per teacher
Pennington, NJ
A+Overall grade537 students6 students per teacher
#5 Private Schools with the Smallest Classes in Mercer County, NJ
Villa Victoria Academy
Independent Catholic school · Grades 6–12
5.8 students per teacher
Ewing, NJ
A+Overall gradeAll girls94 students6 students per teacher
#6 Private Schools with the Smallest Classes in Mercer County, NJ
Chapin School
Independent school · Grades Pre-K–8
6 students per teacher
Princeton, NJ
A+Overall grade171 students6 students per teacher
#7 Private Schools with the Smallest Classes in Mercer County, NJ
Princeton International SCHL of Math and Science
Independent school · Grades 9–12
6.2 students per teacher
Princeton, NJ
B+Overall grade120 students6 students per teacher
#8 Private Schools with the Smallest Classes in Mercer County, NJ
Peddie School
Alternative school · Grades 9–12
7.2 students per teacher
Hightstown, NJ
B+Overall grade516 students7 students per teacher
#9 Private Schools with the Smallest Classes in Mercer County, NJ
Princeton Day School
Independent school · Grades Pre-K–12
7.4 students per teacher
Princeton, NJ
A+Overall grade952 students7 students per teacher
#10 Private Schools with the Smallest Classes in Mercer County, NJ
The Lawrenceville School
Independent school · Grades 9–12
7.4 students per teacher
Lawrenceville, NJ
AOverall grade802 students7 students per teacher
#11 Private Schools with the Smallest Classes in Mercer County, NJ
St. Raphael School
Diocesan school · Grades Pre-K–8
9.3 students per teacher
Hamilton, NJ
A+Overall grade138 students9 students per teacher
#12 Private Schools with the Smallest Classes in Mercer County, NJ
Scicore Academy
Independent school · Grades Pre-K–12
9.5 students per teacher
Hightstown, NJ
BOverall grade105 students10 students per teacher
#13 Private Schools with the Smallest Classes in Mercer County, NJ
Scicore Academy
Independent school · Grades Pre-K–12
9.5 students per teacher
Highstown, NJ
BOverall grade105 students10 students per teacher
#14 Private Schools with the Smallest Classes in Mercer County, NJ
Trenton Catholic Preparatory Academy-Upper
Independent Catholic school · Grades K–12
9.9 students per teacher
Hamilton, NJ
A+Overall grade399 students10 students per teacher
#15 Private Schools with the Smallest Classes in Mercer County, NJ
St. Gregory the Great Academy
Parish school · Grades Pre-K–8
10.4 students per teacher
Hamilton, NJ
B+Overall grade410 students10 students per teacher
#16 Private Schools with the Smallest Classes in Mercer County, NJ
St. Paul School of Princeton
Parish school · Grades Pre-K–8
10.4 students per teacher
Princeton, NJ
A+Overall grade245 students10 students per teacher
#17 Private Schools with the Smallest Classes in Mercer County, NJ
St. Ann Elementary School
Diocesan school · Grades Pre-K–8
10.9 students per teacher
Lawrenceville, NJ
A+Overall grade177 students11 students per teacher
#18 Private Schools with the Smallest Classes in Mercer County, NJ
Our Lady of Sorrows School
Parish school · Grades Pre-K–8
12.4 students per teacher
Mercerville, NJ
A-Overall grade168 students12 students per teacher
#19 Private Schools with the Smallest Classes in Mercer County, NJ
Notre Dame High School
Diocesan school · Grades 9–12
13.2 students per teacher
Lawrenceville, NJ
B+Overall grade894 students13 students per teacher
#20 Private Schools with the Smallest Classes in Mercer County, NJ
Trenton Catholic Preparatory Academy Lower School
Independent Catholic school · Grades Pre-K–8
13.5 students per teacher
Hamilton, NJ
A-Overall grade226 students14 students per teacher
#21 Private Schools with the Smallest Classes in Mercer County, NJ
The Montessori School of Hamilton
Greek Orthodox · Montessori · Grades Pre-K–2
14.7 students per teacher
Hamilton, NJ
B+Overall grade44 students15 students per teacher
#22 Private Schools with the Smallest Classes in Mercer County, NJ
Faith Christian Academy
Baptist school · Grades Pre-K–8
17.5 students per teacher
Hamilton, NJ
B-Overall grade186 students18 students per teacher
From official public records, updated October 2026.