#1 Best Boarding 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
2026 lists
Best Boarding Schools in Middlesex County, MA
The highest-graded schools of this kind in Middlesex County, MA. Top 6 of 6 schools.
#2 Best Boarding 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
#3 Best Boarding 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
#4 Best Boarding Schools in Middlesex County, MA
The Cambridge School of Weston
Independent school · Grades 9–12
100% of graduates go to four-year colleges
Weston, MA
A+Overall grade307 students7 students per teacher
#5 Best Boarding Schools in Middlesex County, MA
Lawrence Academy
Independent school · Grades 9–12
The only independent school in Groton
Groton, MA
A-Overall grade415 students7 students per teacher
#6 Best Boarding Schools in Middlesex County, MA
New England Innovation Academy
Independent school · Grades 6–12
Small classes: about 6 students per teacher
Marlborogh, MA
BOverall grade107 students6 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.