#25 Largest Private Schools in San Mateo County, CA
Charles Armstrong School
Special education school · Grades 2–8
239 students
Belmont, CA
AOverall grade239 students6 students per teacher
2026 lists
Largest Private Schools in San Mateo County, CA
The private schools in San Mateo County, CA with the most students. Top 50 of 58 schools.
From official public records, updated October 2026.