#1 Private Schools with the Smallest Classes in Boston, MA
Learning Project Elementary School
Independent school · Grades K–6
3.7 students per teacher
Boston, MA
A+Overall grade118 students4 students per teacher
2026 lists
Private Schools with the Smallest Classes in Boston, MA
Private schools in Boston, MA with the fewest students per teacher (not counting preschools and special education schools). Top 14 of 14 schools.
#2 Private Schools with the Smallest Classes in Boston, MA
Commonwealth School
Independent school · Grades 9–12
3.9 students per teacher
Boston, MA
A+Overall grade154 students4 students per teacher
#3 Private Schools with the Smallest Classes in Boston, MA
German International School Boston
Independent school · Grades Pre-K–12
4.2 students per teacher
Boston, MA
A+Overall grade256 students4 students per teacher
#4 Private Schools with the Smallest Classes in Boston, MA
Kingsley Montessori School
Montessori school · Grades Pre-K–6
4.6 students per teacher
Boston, MA
AOverall grade184 students5 students per teacher
#5 Private Schools with the Smallest Classes in Boston, MA
The Newman School
Independent school · Grades 7–12
5 students per teacher
Boston, MA
A+Overall grade251 students5 students per teacher
#6 Private Schools with the Smallest Classes in Boston, MA
The Newman School
Independent school · Grades 7–12
5.4 students per teacher
Boston, MA
A+Overall grade244 students5 students per teacher
#7 Private Schools with the Smallest Classes in Boston, MA
The Advent School
Independent school · Grades Pre-K–6
6 students per teacher
Boston, MA
AOverall grade161 students6 students per teacher
#8 Private Schools with the Smallest Classes in Boston, MA
The Winsor School
Independent school · Grades 5–12
6.1 students per teacher
Boston, MA
A+Overall gradeAll girls475 students6 students per teacher
#9 Private Schools with the Smallest Classes in Boston, MA
Boston Trinity Academy
Christian school (nondenominational) · Grades 6–12
6.7 students per teacher
Boston, MA
A+Overall grade238 students7 students per teacher
#10 Private Schools with the Smallest Classes in Boston, MA
Boston University Academy
Independent school · Grades 9–12
6.7 students per teacher
Boston, MA
A+Overall grade233 students7 students per teacher
#11 Private Schools with the Smallest Classes in Boston, MA
St. John School
Diocesan school · Grades Pre-K–8
6.8 students per teacher
Boston, MA
A+Overall grade121 students7 students per teacher
#12 Private Schools with the Smallest Classes in Boston, MA
Park Street School
Christian school (nondenominational) · Grades Pre-K–6
7.5 students per teacher
Boston, MA
A+Overall grade162 students8 students per teacher
#13 Private Schools with the Smallest Classes in Boston, MA
British International School of Boston
Independent school · Grades Pre-K–12
9.1 students per teacher
Boston, MA
B+Overall grade481 students9 students per teacher
#14 Private Schools with the Smallest Classes in Boston, MA
Cathedral High School
Independent Catholic school · Grades 7–12
9.1 students per teacher
Boston, MA
A+Overall grade326 students9 students per teacher
From official public records, updated October 2026.