#25 Best Private Middle Schools in San Mateo County, CA
St. Gregory School
Diocesan school · Grades K–8
One of 5 Catholic schools in San Mateo
San Mateo, CA
B+Overall grade297 students19 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.
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.