#1 Best Private Schools in Middlesex County, MA
Belmont Day School
Independent school · Grade 1
The only independent school in Belmont
Belmont, MA
A+Overall grade334 students4 students per teacher
2026 lists
Best Private Schools in Middlesex County, MA
Private schools in Middlesex County, MA with the highest overall grades. Top 50 of 67 schools.
#2 Best Private Schools in Middlesex County, MA
St. Michael School
Diocesan school · Grades Pre-K–8
Smaller classes than 99% of Catholic schools in Massachusetts
Lowell, MA
A+Overall grade148 students4 students per teacher
#3 Best Private Schools in Middlesex County, MA
Wellan Montessori School
Montessori school · Grades Pre-K–8
The only Montessori school in Newton
Newton, MA
A+Overall grade167 students2 students per teacher
#4 Best Private Schools in Middlesex County, MA
Meadowbrook School of Weston
Independent school · Grades Pre-K–8
Smaller classes than 77% of independent schools in Massachusetts
Weston, MA
A+Overall grade295 students5 students per teacher
#5 Best Private Schools in Middlesex County, MA
Chapel Hill Chauncy Hall School
Independent school · Grades 8–12
The only independent school in Waltham
Waltham, MA
A+Overall grade198 students5 students per teacher
#6 Best Private Schools in Middlesex County, MA
Groton School
Episcopal school · Grades 8–12
The only Christian school in Groton
Groton, MA
A+Overall grade381 students6 students per teacher
#7 Best Private Schools in Middlesex County, MA
Lesley Ellis School
Independent school · Grades Pre-K–8
The only independent school in Arlington
Arlington, MA
A+Overall grade155 students4 students per teacher
#8 Best Private Schools in Middlesex County, MA
Lexington Christian Academy
Christian school (nondenominational) · Grades 6–12
The only Christian school in Lexington
Lexington, MA
A+Overall grade290 students9 students per teacher
#9 Best Private Schools in Middlesex County, MA
Hillside School
Independent school · Grades 4–9
The only independent school in Marlborough
Marlborough, MA
A+Overall gradeAll boys140 students5 students per teacher
#10 Best Private Schools in Middlesex County, MA
Newton Country Day School
Independent Catholic school · Grades 5–12
The only all-girls school in Newton
Newton, MA
A+Overall gradeAll girls374 students5 students per teacher
#11 Best Private Schools in Middlesex County, MA
Brimmer & May School
Independent school · Grades Pre-K–12
98% of graduates go to four-year colleges
Chestnut Hill, MA
A+Overall grade394 students6 students per teacher
#12 Best Private Schools in Middlesex County, MA
Cambridge Friends School
Quaker (Friends) school · Grades Pre-K–8
Smaller classes than 70% of Christian schools in Massachusetts
Cambridge, MA
A+Overall grade122 students7 students per teacher
#13 Best Private Schools in Middlesex County, MA
St. Patrick Elementary School
Parish school · Grades Pre-K–8
Smaller classes than 95% of Catholic schools in Massachusetts
Stoneham, MA
A+Overall grade208 students7 students per teacher
#14 Best Private Schools in Middlesex County, MA
St. Joseph Elementary School
Parish school · Grades Pre-K–8
Smaller classes than 68% of Catholic schools in Massachusetts
Medford, MA
A+Overall grade147 students10 students per teacher
#15 Best Private Schools in Middlesex County, MA
St. Patrick School and Educational Center
Independent Catholic school · Grades K–8
Smaller classes than 80% of Catholic schools in Massachusetts
Lowell, MA
A+Overall grade84 students8 students per teacher
#16 Best Private Schools in Middlesex County, MA
Our Ladys Academy
Parish school · Grades Pre-K–8
The only Catholic school in Waltham
Waltham, MA
A+Overall grade328 students8 students per teacher
#17 Best Private Schools in Middlesex County, MA
Cheverus Catholic School
Parish school · Grades Pre-K–8
Serving families in Malden since at least 2011
Malden, MA
A+Overall grade289 students12 students per teacher
#18 Best Private Schools in Middlesex County, MA
St. Charles School
Parish school · Grades Pre-K–8
Smaller classes than 68% of Catholic schools in Massachusetts
Woburn, MA
A+Overall grade151 students10 students per teacher
#19 Best Private Schools in Middlesex County, MA
St. Peter School
Parish school · Grades Pre-K–8
Smaller classes than 73% of Catholic schools in Massachusetts
Cambridge, MA
A+Overall grade166 students10 students per teacher
#20 Best Private Schools in Middlesex County, MA
Mount Alvernia Academy
Independent Catholic school · Grades Pre-K–6
The only Catholic school in Chestnut Hill
Chestnut Hill, MA
A+Overall grade252 students10 students per teacher
#21 Best Private Schools in Middlesex County, MA
Acera School
Independent school · Grades K–12
The only independent school in Winchester
Winchester, MA
A+Overall grade122 students5 students per teacher
#22 Best Private Schools in Middlesex County, MA
The Rivers School
Independent school · Grades 6–12
The largest independent school in Weston
Weston, MA
A+Overall grade525 students6 students per teacher
#23 Best Private Schools in Middlesex County, MA
Riverbend School
Montessori school · Grades Pre-K–8
The only Montessori school in Natick
Natick, MA
A+Overall grade126 students3 students per teacher
#24 Best Private Schools in Middlesex County, MA
St. Agnes School
Diocesan school · Grades Pre-K–8
Smaller classes than 64% of Catholic schools in Massachusetts
Arlington, MA
A+Overall grade291 students10 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.