#1 Largest Private Schools in Arlington, MA
Arlington Catholic High School/Saint Agnes School
Diocesan school · Grades Pre-K–12
851 students
Arlington, MA
A-Overall grade851 students10 students per teacher
2026 lists
Largest Private Schools in Arlington, MA
The private schools in Arlington, MA with the most students. Top 5 of 5 schools.
#2 Largest Private Schools in Arlington, MA
St. Agnes School
Diocesan school · Grades Pre-K–8
291 students
Arlington, MA
A+Overall grade291 students10 students per teacher
#3 Largest Private Schools in Arlington, MA
Lesley Ellis School
Independent school · Grades Pre-K–8
155 students
Arlington, MA
A+Overall grade155 students4 students per teacher
#4 Largest Private Schools in Arlington, MA
New Covenant School
Christian school (nondenominational) · Grades Pre-K–5
65 students
Arlington, MA
AOverall grade65 students9 students per teacher
#5 Largest Private Schools in Arlington, MA
Cns/Pathways Academy
Special education school · Grades 5–12
29 students
Arlington, MA
AOverall grade29 students4 students per teacher
From official public records, updated October 2026.