#1 Private Schools with the Smallest Classes in Middlesex County, MA
Wellan Montessori School
Montessori school · Grades Pre-K–8
1.9 students per teacher
Newton, MA
A+Overall grade167 students2 students per teacher
2026 lists
Private Schools with the Smallest Classes in Middlesex County, MA
Private schools in Middlesex County, MA with the fewest students per teacher (not counting preschools and special education schools). Top 50 of 71 schools.
#2 Private Schools with the Smallest Classes in Middlesex County, MA
Metrowest Jewish Day School
Jewish day school · Grades K–8
2.6 students per teacher
Framingham, MA
A+Overall grade40 students3 students per teacher
#3 Private Schools with the Smallest Classes in Middlesex County, MA
Fusion Academy Newton
Alternative school · Grades 6–12
2.7 students per teacher
Newton, MA
A-Overall grade69 students3 students per teacher
#4 Private Schools with the Smallest Classes in Middlesex County, MA
Riverbend School
Montessori school · Grades Pre-K–8
2.8 students per teacher
Natick, MA
A+Overall grade126 students3 students per teacher
#5 Private Schools with the Smallest Classes in Middlesex County, MA
Corwin-Russell School at Broccoli Hall
Independent school · Grades 6–12
3.1 students per teacher
Sudbury, MA
A+Overall grade40 students3 students per teacher
#6 Private Schools with the Smallest Classes in Middlesex County, MA
Star Academy for the Gifted and Talented
Independent school · Grades Pre-K–11
3.6 students per teacher
Watertown, MA
A-Overall grade217 students4 students per teacher
#7 Private Schools with the Smallest Classes in Middlesex County, MA
St. Michael School
Diocesan school · Grades Pre-K–8
3.6 students per teacher
Lowell, MA
A+Overall grade148 students4 students per teacher
#8 Private Schools with the Smallest Classes in Middlesex County, MA
St. Paul's Choir School
Independent Catholic school · Grades 3–8
4 students per teacher
Cambridge, MA
A+Overall gradeAll boys40 students4 students per teacher
#9 Private Schools with the Smallest Classes in Middlesex County, MA
Belmont Day School
Independent school · Grade 1
4.1 students per teacher
Belmont, MA
A+Overall grade334 students4 students per teacher
#10 Private Schools with the Smallest Classes in Middlesex County, MA
Solomon Schechtee Day School
Jewish day school · Grades Pre-K–8
4.2 students per teacher
Newton, MA
A-Overall grade359 students4 students per teacher
#11 Private Schools with the Smallest Classes in Middlesex County, MA
Lesley Ellis School
Independent school · Grades Pre-K–8
4.4 students per teacher
Arlington, MA
A+Overall grade155 students4 students per teacher
#12 Private Schools with the Smallest Classes in Middlesex County, MA
Summit Montessori School
Montessori school · Grades Pre-K–6
4.5 students per teacher
Framingham, MA
AOverall grade65 students5 students per teacher
#13 Private Schools with the Smallest Classes in Middlesex County, MA
Meadowbrook School of Weston
Independent school · Grades Pre-K–8
4.6 students per teacher
Weston, MA
A+Overall grade295 students5 students per teacher
#14 Private Schools with the Smallest Classes in Middlesex County, MA
Hillside School
Independent school · Grades 4–9
4.8 students per teacher
Marlborough, MA
A+Overall gradeAll boys140 students5 students per teacher
#15 Private Schools with the Smallest Classes in Middlesex County, MA
Acera School
Independent school · Grades K–12
4.8 students per teacher
Winchester, MA
A+Overall grade122 students5 students per teacher
#16 Private Schools with the Smallest Classes in Middlesex County, MA
Newton Country Day School
Independent Catholic school · Grades 5–12
5.1 students per teacher
Newton, MA
A+Overall gradeAll girls374 students5 students per teacher
#17 Private Schools with the Smallest Classes in Middlesex County, MA
Chapel Hill Chauncy Hall School
Independent school · Grades 8–12
5.1 students per teacher
Waltham, MA
A+Overall grade198 students5 students per teacher
#18 Private Schools with the Smallest Classes in Middlesex County, MA
Nashoba Brooks School
Independent school · Grades Pre-K–8
5.3 students per teacher
Concord, MA
AOverall grade192 students5 students per teacher
#19 Private Schools with the Smallest Classes in Middlesex County, MA
Atrium School
Independent school · Grades Pre-K–8
5.3 students per teacher
Watertown, MA
A+Overall grade110 students5 students per teacher
#20 Private Schools with the Smallest Classes in Middlesex County, MA
Brimmer & May School
Independent school · Grades Pre-K–12
5.6 students per teacher
Chestnut Hill, MA
A+Overall grade394 students6 students per teacher
#21 Private Schools with the Smallest Classes in Middlesex County, MA
Groton School
Episcopal school · Grades 8–12
5.6 students per teacher
Groton, MA
A+Overall grade381 students6 students per teacher
#22 Private Schools with the Smallest Classes in Middlesex County, MA
Solomon Schechter Day School
Jewish day school · Grades Pre-K–8
5.6 students per teacher
Newton, MA
B-Overall grade359 students6 students per teacher
#23 Private Schools with the Smallest Classes in Middlesex County, MA
Jewish Community Day School, INC DBA JCDS Bostons
Jewish day school · Grades K–8
5.8 students per teacher
Watertown, MA
BOverall grade166 students6 students per teacher
#24 Private Schools with the Smallest Classes in Middlesex County, MA
Birches School
Alternative school · Grades Pre-K–8
5.8 students per teacher
Lincoln, MA
B+Overall grade73 students6 students per teacher
From official public records, updated October 2026.