#1 Most Diverse Private Schools in Costa Mesa, CA
St. John the Baptist Catholic School
Diocesan school · Grades K–8
Largest group: 39% of students
Costa Mesa, CA
A+Overall grade505 students17 students per teacher
2026 lists
Most Diverse Private Schools in Costa Mesa, CA
Private schools in Costa Mesa, CA with the most varied mix of students. Top 6 of 6 schools.
#2 Most Diverse Private Schools in Costa Mesa, CA
The Waldorf School of Orange County
Independent school · Grades Pre-K–12
Largest group: 54% of students
Costa Mesa, CA
BOverall grade283 students11 students per teacher
#3 Most Diverse Private Schools in Costa Mesa, CA
Renascence School International
Independent school · Grades K–11
Largest group: 56% of students
Costa Mesa, CA
AOverall grade96 students6 students per teacher
#4 Most Diverse Private Schools in Costa Mesa, CA
Pacific Academy
Independent school · Grades Pre-K–6
Largest group: 68% of students
Costa Mesa, CA
A-Overall grade78 students6 students per teacher
#5 Most Diverse Private Schools in Costa Mesa, CA
Mariners Christian School
Christian school (nondenominational) · Grades K–8
Largest group: 72% of students
Costa Mesa, CA
B+Overall grade720 students14 students per teacher
#6 Most Diverse Private Schools in Costa Mesa, CA
St. Joachim Elementary School
Parish school · Grades K–8
Largest group: 77% of students
Costa Mesa, CA
AOverall grade244 students15 students per teacher
From official public records, updated October 2026.