#1 Best Private Middle Schools in San Mateo County, CA
Episcopal Day School of St. Matthew
Episcopal school · Grades Pre-K–8
The only Christian school in San Mateo
San Mateo, CA
A+Overall grade290 students6 students per teacher
2026 lists
Best Private Middle Schools in San Mateo County, CA
Private schools in San Mateo County, CA with middle-school grades and the highest overall grades. Top 32 of 32 schools.
#2 Best Private Middle Schools in San Mateo County, CA
Nativity Elementary School
Diocesan school · Grades Pre-K–8
Smaller classes than 84% of Catholic schools in California
Menlo Park, CA
A+Overall grade231 students12 students per teacher
#3 Best Private Middle Schools in San Mateo County, CA
Notre Dame Elementary School
Independent Catholic school · Grades Pre-K–8
Smaller classes than 75% of Catholic schools in California
Belmont, CA
A+Overall grade179 students13 students per teacher
#4 Best Private Middle Schools in San Mateo County, CA
St. Dunstan Catholic School
Parish school · Grades K–8
Smaller classes than 80% of Catholic schools in California
Millbrae, CA
A+Overall grade246 students12 students per teacher
#5 Best Private Middle Schools in San Mateo County, CA
St. Timothy School
Diocesan school · Grades K–8
The smallest classes of any Catholic school in San Mateo
San Mateo, CA
A+Overall grade152 students15 students per teacher
#6 Best Private Middle Schools in San Mateo County, CA
Holy Angels School
Parish school · Grades Pre-K–8
Smaller classes than 87% of Catholic schools in California
Colma, CA
A+Overall grade117 students11 students per teacher
#7 Best Private Middle Schools in San Mateo County, CA
Woodside Priory School
Independent Catholic school · Grades 6–12
100% of graduates go to four-year colleges
Portola Valley, CA
A+Overall grade427 students10 students per teacher
#8 Best Private Middle Schools in San Mateo County, CA
Our Lady Perpetual Help School
Diocesan school · Grades Pre-K–8
Serving families in Daly City since at least 2011
Daly City, CA
A+Overall grade159 students16 students per teacher
#9 Best Private Middle Schools in San Mateo County, CA
Hilldale School
Independent school · Grades K–8
Smaller classes than 66% of independent schools in California
Daly City, CA
A+Overall grade162 students6 students per teacher
#10 Best Private Middle Schools in San Mateo County, CA
Synapse School
Independent school · Grades K–8
Growing: enrollment up 506% since 2011–12
Menlo Park, CA
A+Overall grade327 students7 students per teacher
#11 Best Private Middle Schools in San Mateo County, CA
All Souls Catholic Elementary School
Parish school · Grades Pre-K–8
The only Catholic school in South San Francisco
South San Francisco, CA
A+Overall grade218 students17 students per teacher
#12 Best Private Middle Schools in San Mateo County, CA
Woodland School
Independent school · Grades Pre-K–8
Growing: enrollment up 37% since 2011–12
Portola Valley, CA
A+Overall grade272 students8 students per teacher
#13 Best Private Middle Schools in San Mateo County, CA
The Nueva School
Independent school · Grades Pre-K–12
The largest independent school in San Mateo
San Mateo, CA
A+Overall grade950 students7 students per teacher
#14 Best Private Middle Schools in San Mateo County, CA
Pacific Bay Christian School
Christian school (nondenominational) · Grades 6–12
The only Christian school in Pacifica
Pacifica, CA
A+Overall grade181 students10 students per teacher
#15 Best Private Middle Schools in San Mateo County, CA
St. Catherine of Siena School
Parish school · Grades K–8
Serving families in Burlingame since at least 2011
Burlingame, CA
A+Overall grade303 students17 students per teacher
#16 Best Private Middle Schools in San Mateo County, CA
St. Charles School
Diocesan school · Grades K–8
Smaller classes than 63% of Catholic schools in California
San Carlos, CA
A+Overall grade263 students15 students per teacher
#17 Best Private Middle Schools in San Mateo County, CA
Immaculate Heart of Mary School
Parish school · Grades Pre-K–8
Smaller classes than 98% of Catholic schools in California
Belmont, CA
A+Overall grade100 students8 students per teacher
#18 Best Private Middle Schools in San Mateo County, CA
St. Raymond Elementary School
Diocesan school · Grades K–8
Smaller classes than 87% of Catholic schools in California
Menlo Park, CA
AOverall grade241 students11 students per teacher
#19 Best Private Middle Schools in San Mateo County, CA
Good Shepherd Elementary School
Parish school · Grades K–8
The only Catholic school in Pacifica
Pacifica, CA
AOverall grade198 students18 students per teacher
#20 Best Private Middle Schools in San Mateo County, CA
Sea Crest School
Independent school · Grades Pre-K–8
Serving families in Half Moon Bay since at least 2011
Half Moon Bay, CA
A-Overall grade280 students10 students per teacher
#21 Best Private Middle Schools in San Mateo County, CA
Ronald C Wornick Jewish Day School
Jewish day school · Grades K–8
Smaller classes than 71% of Jewish day schools in California
Foster City, CA
A-Overall grade199 students5 students per teacher
#22 Best Private Middle Schools in San Mateo County, CA
Stanford Online High School
Independent school · Grades 7–12
100% of graduates go to four-year colleges
Redwood City, CA
B+Overall grade985 students15 students per teacher
#23 Best Private Middle Schools in San Mateo County, CA
Redeemer Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
The only Christian school in Redwood City
Redwood City, CA
B+Overall grade173 students14 students per teacher
#24 Best Private Middle Schools in San Mateo County, CA
Crystal Springs Uplands School
Independent school · Grades 6–12
The only independent school in Hillsborough
Hillsborough, CA
B+Overall grade569 students9 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.