#1 Largest Private Schools in Altadena, CA
Pasadena Waldorf School
Independent school · Grades Pre-K–12
212 students
Altadena, CA
A+Overall grade212 students5 students per teacher
2026 lists
Largest Private Schools in Altadena, CA
The private schools in Altadena, CA with the most students. Top 6 of 6 schools.
#2 Largest Private Schools in Altadena, CA
St. Elizabeth School
Parish school · Grades K–8
154 students
Altadena, CA
A+Overall grade154 students14 students per teacher
#3 Largest Private Schools in Altadena, CA
Sahag-Mesrob Armenian Christian School
Christian school (nondenominational) · Grades Pre-K–8
131 students
Altadena, CA
AOverall grade131 students10 students per teacher
#4 Largest Private Schools in Altadena, CA
Oak Knoll Montessori School
Montessori school · Grades Pre-K–8
51 students
Altadena, CA
AOverall grade51 students2 students per teacher
#5 Largest Private Schools in Altadena, CA
Fair Oaks School
Independent school · Grades K–5
30 students
Altadena, CA
AOverall grade30 students5 students per teacher
#6 Largest Private Schools in Altadena, CA
Firehouse Preschool
Independent school · Grades Pre-K–2
25 students
Altadena, CA
AOverall grade25 students5 students per teacher
From official public records, updated October 2026.