#1 Largest Private Schools in Suffolk County, MA
Boston College High School
Independent Catholic school · Grades 7–12
1,439 students
Dorchester, MA
AOverall gradeAll boys1,439 students13 students per teacher
2026 lists
Largest Private Schools in Suffolk County, MA
The private schools in Suffolk County, MA with the most students. Top 47 of 47 schools.
#2 Largest Private Schools in Suffolk County, MA
Catholic Memorial
Independent Catholic school · Grades 7–12
605 students
West Roxbury, MA
B+Overall gradeAll boys605 students13 students per teacher
#3 Largest Private Schools in Suffolk County, MA
British International School of Boston
Independent school · Grades Pre-K–12
481 students
Boston, MA
B+Overall grade481 students9 students per teacher
#4 Largest Private Schools in Suffolk County, MA
The Winsor School
Independent school · Grades 5–12
475 students
Boston, MA
A+Overall gradeAll girls475 students6 students per teacher
#5 Largest Private Schools in Suffolk County, MA
St. John Paul Lower Mills
Diocesan school · Grades Pre-K–8
340 students
Dorchester, MA
B-Overall grade340 students14 students per teacher
#6 Largest Private Schools in Suffolk County, MA
Cathedral High School
Independent Catholic school · Grades 7–12
326 students
Boston, MA
A+Overall grade326 students9 students per teacher
#7 Largest Private Schools in Suffolk County, MA
Croft School
Independent school · Grades Pre-K–5
320 students
Jamaica Plain, MA
B-Overall grade320 students9 students per teacher
#8 Largest Private Schools in Suffolk County, MA
St. Columbkille Partnership School
Independent Catholic school · Grades Pre-K–8
307 students
Brighton, MA
A+Overall grade307 students12 students per teacher
#9 Largest Private Schools in Suffolk County, MA
St. John Paul II Academy, Neponset
Diocesan school · Grades Pre-K–8
292 students
Dorchester, MA
BOverall grade292 students13 students per teacher
#10 Largest Private Schools in Suffolk County, MA
St. John Paul II Catholic Academy
Diocesan school · Grades Pre-K–8
277 students
Dorchester Center, MA
B-Overall grade277 students17 students per teacher
#11 Largest Private Schools in Suffolk County, MA
Immaculate Conception
Parish school · Grades Pre-K–8
272 students
Revere, MA
AOverall grade272 students12 students per teacher
#12 Largest Private Schools in Suffolk County, MA
Holy Name Parish School
Parish school · Grades Pre-K–6
257 students
West Roxbury, MA
BOverall grade257 students14 students per teacher
#13 Largest Private Schools in Suffolk County, MA
German International School Boston
Independent school · Grades Pre-K–12
256 students
Boston, MA
A+Overall grade256 students4 students per teacher
#14 Largest Private Schools in Suffolk County, MA
The Newman School
Independent school · Grades 7–12
251 students
Boston, MA
A+Overall grade251 students5 students per teacher
#15 Largest Private Schools in Suffolk County, MA
St. Theresa School
Diocesan school · Grades Pre-K–6
244 students
West Roxbury, MA
B+Overall grade244 students14 students per teacher
#16 Largest Private Schools in Suffolk County, MA
The Newman School
Independent school · Grades 7–12
244 students
Boston, MA
A+Overall grade244 students5 students per teacher
#17 Largest Private Schools in Suffolk County, MA
Boston Trinity Academy
Christian school (nondenominational) · Grades 6–12
238 students
Boston, MA
A+Overall grade238 students7 students per teacher
#18 Largest Private Schools in Suffolk County, MA
Boston University Academy
Independent school · Grades 9–12
233 students
Boston, MA
A+Overall grade233 students7 students per teacher
#19 Largest Private Schools in Suffolk County, MA
Cristo Rey Boston High School
Diocesan school · Grades 9–12
230 students
Dorchester, MA
B+Overall grade230 students15 students per teacher
#20 Largest Private Schools in Suffolk County, MA
St. John Paul II Catholic Academy Columbia Camp
Diocesan school · Grades Pre-K–8
214 students
Dorchester, MA
A+Overall grade214 students11 students per teacher
#21 Largest Private Schools in Suffolk County, MA
Kingsley Montessori School
Montessori school · Grades Pre-K–6
184 students
Boston, MA
AOverall grade184 students5 students per teacher
#22 Largest Private Schools in Suffolk County, MA
Park Street School
Christian school (nondenominational) · Grades Pre-K–6
162 students
Boston, MA
A+Overall grade162 students8 students per teacher
#23 Largest Private Schools in Suffolk County, MA
East Boston Central Catholic School
Parish school · Grades Pre-K–8
161 students
East Boston, MA
B+Overall grade161 students15 students per teacher
#24 Largest Private Schools in Suffolk County, MA
The Advent School
Independent school · Grades Pre-K–6
161 students
Boston, MA
AOverall grade161 students6 students per teacher
From official public records, updated October 2026.