#1 Largest Private Schools in California
Isea International
Independent school · Grades K–12
7,818 students
Newport Beach, CA
B-Overall grade7,818 students
2026 lists
Largest Private Schools in California
The private schools in California with the most students. Top 50 of 1,834 schools.
#2 Largest Private Schools in California
Fairmont Private School
Independent school · Grades Pre-K–12
2,391 students
Anaheim, CA
B+Overall grade2,391 students11 students per teacher
#3 Largest Private Schools in California
Harker
Independent school · Grades K–12
1,983 students
San Jose, CA
BOverall grade1,983 students10 students per teacher
#4 Largest Private Schools in California
Chaminade College Preparatory-High School
Independent Catholic school · Grades 6–12
1,859 students
West Hills, CA
BOverall grade1,859 students26 students per teacher
#5 Largest Private Schools in California
St. Francis High School
Diocesan school · Grades 9–12
1,777 students
Mountain View, CA
A+Overall grade1,777 students6 students per teacher
#6 Largest Private Schools in California
Archbishop Mitty High School
Diocesan school · Grades 9–12
1,770 students
San Jose, CA
A+Overall grade1,770 students14 students per teacher
#7 Largest Private Schools in California
Cathedral Catholic High School
Diocesan school · Grades 9–12
1,669 students
San Diego, CA
BOverall grade1,669 students17 students per teacher
#8 Largest Private Schools in California
Bellarmine College Preparatory
Independent Catholic school · Grades 9–12
1,664 students
San Jose, CA
B+Overall gradeAll boys1,664 students18 students per teacher
#9 Largest Private Schools in California
Oaks Christian School
Christian school (nondenominational) · Grades 4–12
1,663 students
Westlake Village, CA
A+Overall grade1,663 students11 students per teacher
#10 Largest Private Schools in California
Mater Dei Catholic High School
Diocesan school · Grades K–12
1,659 students
Chula Vista, CA
B-Overall grade1,659 students16 students per teacher
#11 Largest Private Schools in California
Harvard-Westlake
Episcopal school · Grades 7–12
1,617 students
Los Angeles, CA
A+Overall grade1,617 students8 students per teacher
#12 Largest Private Schools in California
St. Ignatius College Preparatory
Independent Catholic school · Grades 6–12
1,585 students
San Francisco, CA
A+Overall grade1,585 students12 students per teacher
#13 Largest Private Schools in California
Ontario Christian School
Christian school (nondenominational) · Grades Pre-K–12
1,438 students
Ontario, CA
B+Overall grade1,438 students17 students per teacher
#14 Largest Private Schools in California
Jserra Catholic High School
Independent Catholic school · Grades 9–12
1,317 students
San Juan Capistrano, CA
A+Overall grade1,317 students6 students per teacher
#15 Largest Private Schools in California
Bridge Academy
Alternative school · Grades Pre-K–12
1,302 students
Los Angeles, CA
BOverall grade1,302 students11 students per teacher
#16 Largest Private Schools in California
Francis W Parker School
Independent school · Grades Pre-K–12
1,280 students
San Diego, CA
BOverall grade1,280 students11 students per teacher
#17 Largest Private Schools in California
Francis Parker School
Independent school · Grades Pre-K–12
1,276 students
San Diego, CA
BOverall grade1,276 students11 students per teacher
#18 Largest Private Schools in California
Bishop Odowd High School
Diocesan school · Grades 9–12
1,263 students
Oakland, CA
AOverall grade1,263 students16 students per teacher
#19 Largest Private Schools in California
Arrowhead Christian Academy
Christian school (nondenominational) · Grades Pre-K–12
1,257 students
Redlands, CA
BOverall grade1,257 students15 students per teacher
#20 Largest Private Schools in California
Notre Dame High School
Independent Catholic school · Grades 9–12
1,255 students
Sherman Oaks, CA
A+Overall grade1,255 students13 students per teacher
#21 Largest Private Schools in California
Redlands Christian School
Christian school (nondenominational) · Grades Pre-K–12
1,250 students
Redlands, CA
B-Overall grade1,250 students14 students per teacher
#22 Largest Private Schools in California
Valley Christian Schools
Christian school (nondenominational) · Grades Pre-K–12
1,239 students
Cerritos, CA
AOverall grade1,239 students15 students per teacher
#23 Largest Private Schools in California
C4l Academy
Independent school · Grades 9–12
1,237 students
Irvine, CA
B-Overall grade1,237 students
#24 Largest Private Schools in California
Brentwood School
Independent school · Grades K–12
1,227 students
Los Angeles, CA
B+Overall grade1,227 students11 students per teacher
From official public records, updated October 2026.