#1 Most Diverse Private Schools in San Mateo County, CA
Synapse School
Independent school · Grades K–8
Largest group: 33% of students
Menlo Park, CA
A+Overall grade327 students7 students per teacher
2026 lists
Most Diverse Private Schools in San Mateo County, CA
Private schools in San Mateo County, CA with the most varied mix of students. Top 44 of 44 schools.
#2 Most Diverse Private Schools in San Mateo County, CA
Woodside Priory School
Independent Catholic school · Grades 6–12
Largest group: 35% of students
Portola Valley, CA
A+Overall grade427 students10 students per teacher
#3 Most Diverse Private Schools in San Mateo County, CA
Notre Dame Elementary School
Independent Catholic school · Grades Pre-K–8
Largest group: 35% of students
Belmont, CA
A+Overall grade179 students13 students per teacher
#4 Most Diverse Private Schools in San Mateo County, CA
Hilldale School
Independent school · Grades K–8
Largest group: 36% of students
Daly City, CA
A+Overall grade162 students6 students per teacher
#5 Most Diverse Private Schools in San Mateo County, CA
Crystal Springs Uplands School
Independent school · Grades 6–12
Largest group: 38% of students
Hillsborough, CA
B+Overall grade569 students9 students per teacher
#6 Most Diverse Private Schools in San Mateo County, CA
St. Timothy School
Diocesan school · Grades K–8
Largest group: 39% of students
San Mateo, CA
A+Overall grade152 students15 students per teacher
#7 Most Diverse Private Schools in San Mateo County, CA
The Nueva School
Independent school · Grades Pre-K–12
Largest group: 40% of students
San Mateo, CA
A+Overall grade950 students7 students per teacher
#8 Most Diverse Private Schools in San Mateo County, CA
St. Catherine of Siena School
Parish school · Grades K–8
Largest group: 40% of students
Burlingame, CA
A+Overall grade303 students17 students per teacher
#9 Most Diverse Private Schools in San Mateo County, CA
Woodland School
Independent school · Grades Pre-K–8
Largest group: 40% of students
Portola Valley, CA
A+Overall grade272 students8 students per teacher
#10 Most Diverse Private Schools in San Mateo County, CA
All Souls Catholic Elementary School
Parish school · Grades Pre-K–8
Largest group: 40% of students
South San Francisco, CA
A+Overall grade218 students17 students per teacher
#11 Most Diverse Private Schools in San Mateo County, CA
Pacific Bay Christian School
Christian school (nondenominational) · Grades 6–12
Largest group: 41% of students
Pacifica, CA
A+Overall grade181 students10 students per teacher
#12 Most Diverse Private Schools in San Mateo County, CA
Sacred Heart Schools Atherton
Independent Catholic school · Grades Pre-K–12
Largest group: 43% of students
Atherton, CA
BOverall grade1,144 students
#13 Most Diverse Private Schools in San Mateo County, CA
St. Dunstan Catholic School
Parish school · Grades K–8
Largest group: 43% of students
Millbrae, CA
A+Overall grade246 students12 students per teacher
#14 Most Diverse Private Schools in San Mateo County, CA
Stanford Online High School
Independent school · Grades 7–12
Largest group: 45% of students
Redwood City, CA
B+Overall grade985 students15 students per teacher
#15 Most Diverse Private Schools in San Mateo County, CA
Menlo School
Independent school · Grades 6–12
Largest group: 45% of students
Atherton, CA
B-Overall grade818 students9 students per teacher
#16 Most Diverse Private Schools in San Mateo County, CA
St. Gregory School
Diocesan school · Grades K–8
Largest group: 47% of students
San Mateo, CA
B+Overall grade297 students19 students per teacher
#17 Most Diverse Private Schools in San Mateo County, CA
Belmont Oaks Academy
Independent school · Grades Pre-K–5
Largest group: 48% of students
Belmont, CA
A-Overall grade227 students9 students per teacher
#18 Most Diverse Private Schools in San Mateo County, CA
Our Lady Perpetual Help School
Diocesan school · Grades Pre-K–8
Largest group: 48% of students
Daly City, CA
A+Overall grade159 students16 students per teacher
#19 Most Diverse Private Schools in San Mateo County, CA
Episcopal Day School of St. Matthew
Episcopal school · Grades Pre-K–8
Largest group: 49% of students
San Mateo, CA
A+Overall grade290 students6 students per teacher
#20 Most Diverse Private Schools in San Mateo County, CA
The Carey School
Independent school · Grades Pre-K–5
Largest group: 50% of students
San Mateo, CA
A+Overall grade252 students7 students per teacher
#21 Most Diverse Private Schools in San Mateo County, CA
Good Shepherd Elementary School
Parish school · Grades K–8
Largest group: 51% of students
Pacifica, CA
AOverall grade198 students18 students per teacher
#22 Most Diverse Private Schools in San Mateo County, CA
St. Matthew Catholic School
Parish school · Grades K–8
Largest group: 52% of students
San Mateo, CA
BOverall grade625 students24 students per teacher
#23 Most Diverse Private Schools in San Mateo County, CA
Jserra Catholic High School
Diocesan school · Grades 9–12
Largest group: 55% of students
San Mateo, CA
BOverall gradeAll boys863 students17 students per teacher
#24 Most Diverse Private Schools in San Mateo County, CA
Junipero Serra High School
Diocesan school · Grades 9–12
Largest group: 55% of students
San Mateo, CA
BOverall gradeAll boys859 students18 students per teacher
From official public records, updated October 2026.