#1 Best Private Middle Schools in Costa Mesa, CA
St. John the Baptist Catholic School
Diocesan school · Grades K–8
Serving families in Costa Mesa since at least 2011
Costa Mesa, CA
A+Overall grade505 students17 students per teacher
2026 lists
Best Private Middle Schools in Costa Mesa, CA
Private schools in Costa Mesa, CA with middle-school grades and the highest overall grades. Top 5 of 5 schools.
#2 Best Private Middle Schools in Costa Mesa, CA
Renascence School International
Independent school · Grades K–11
Growing: enrollment up 68% since 2015–16
Costa Mesa, CA
AOverall grade96 students6 students per teacher
#3 Best Private Middle Schools in Costa Mesa, CA
St. Joachim Elementary School
Parish school · Grades K–8
Smaller classes than 61% of Catholic schools in California
Costa Mesa, CA
AOverall grade244 students15 students per teacher
#4 Best Private Middle Schools in Costa Mesa, CA
Mariners Christian School
Christian school (nondenominational) · Grades K–8
The only Christian school in Costa Mesa
Costa Mesa, CA
B+Overall grade720 students14 students per teacher
#5 Best Private Middle Schools in Costa Mesa, CA
The Waldorf School of Orange County
Independent school · Grades Pre-K–12
The largest independent school in Costa Mesa
Costa Mesa, CA
BOverall grade283 students11 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.