#1 Largest Private Schools in Contra Costa County, CA
De La Salle High School
Independent Catholic school · Grades 9–12
1,042 students
Concord, CA
A+Overall gradeAll boys1,042 students13 students per teacher
2026 lists
Largest Private Schools in Contra Costa County, CA
The private schools in Contra Costa County, CA with the most students. Top 50 of 66 schools.
#2 Largest Private Schools in Contra Costa County, CA
Carondelet High School
Independent Catholic school · Grades 9–12
834 students
Concord, CA
A+Overall gradeAll girls834 students8 students per teacher
#3 Largest Private Schools in Contra Costa County, CA
Bentley School
Independent school · Grades K–12
634 students
Lafayette, CA
AOverall grade634 students8 students per teacher
#4 Largest Private Schools in Contra Costa County, CA
St. Isidore School
Diocesan school · Grades Pre-K–8
616 students
Danville, CA
AOverall grade616 students15 students per teacher
#5 Largest Private Schools in Contra Costa County, CA
Cornerstone Christian School
Assembly of God school · Grades Pre-K–12
559 students
Antioch, CA
B-Overall grade559 students18 students per teacher
#6 Largest Private Schools in Contra Costa County, CA
The Athenian School
Independent school · Grades 6–12
537 students
Danville, CA
A+Overall grade537 students8 students per teacher
#7 Largest Private Schools in Contra Costa County, CA
Prospect Sierra School
Independent school · Grades K–8
476 students
El Cerrito, CA
A+Overall grade476 students5 students per teacher
#8 Largest Private Schools in Contra Costa County, CA
Salesian College Preparatory
Diocesan school · Grades 9–12
413 students
Richmond, CA
B+Overall grade413 students15 students per teacher
#9 Largest Private Schools in Contra Costa County, CA
San Ramon Valley Christian Academy
Presbyterian school · Grades Pre-K–8
392 students
Danville, CA
B+Overall grade392 students12 students per teacher
#10 Largest Private Schools in Contra Costa County, CA
Berean Christian High School
Christian school (nondenominational) · Grades 9–12
380 students
Walnut Creek, CA
BOverall grade380 students14 students per teacher
#11 Largest Private Schools in Contra Costa County, CA
Seven Hills School
Independent school · Grades Pre-K–8
378 students
Walnut Creek, CA
B+Overall grade378 students10 students per teacher
#12 Largest Private Schools in Contra Costa County, CA
Kings Valley Christian School
Christian school (nondenominational) · Grades Pre-K–8
361 students
Concord, CA
AOverall grade361 students15 students per teacher
#13 Largest Private Schools in Contra Costa County, CA
St. Patrick School
Diocesan school · Grades Pre-K–8
357 students
Rodeo, CA
A+Overall grade357 students12 students per teacher
#14 Largest Private Schools in Contra Costa County, CA
Contra Costa Christian Schools
Christian school (nondenominational) · Grades Pre-K–12
335 students
Walnut Creek, CA
AOverall grade335 students12 students per teacher
#15 Largest Private Schools in Contra Costa County, CA
The Dorris-Eaton School
Independent school · Grades Pre-K–8
332 students
San Ramon, CA
BOverall grade332 students7 students per teacher
#16 Largest Private Schools in Contra Costa County, CA
Christ the King Catholic School
Diocesan school · Grades K–8
322 students
Pleasant Hill, CA
A+Overall grade322 students17 students per teacher
#17 Largest Private Schools in Contra Costa County, CA
St. Joseph Elementary School
Diocesan school · Grades Pre-K–8
322 students
Pinole, CA
B+Overall grade322 students26 students per teacher
#18 Largest Private Schools in Contra Costa County, CA
Holy Rosary Elementary School
Diocesan school · Grades Pre-K–8
313 students
Antioch, CA
A-Overall grade313 students19 students per teacher
#19 Largest Private Schools in Contra Costa County, CA
St. Francis of Assisi
Diocesan school · Grades K–8
300 students
Concord, CA
A+Overall grade300 students17 students per teacher
#20 Largest Private Schools in Contra Costa County, CA
St. Mary Elementary School
Diocesan school · Grades Pre-K–8
300 students
Walnut Creek, CA
B+Overall grade300 students20 students per teacher
#21 Largest Private Schools in Contra Costa County, CA
Queen of All Saints School
Diocesan school · Grades Pre-K–8
287 students
Concord, CA
B+Overall grade287 students21 students per teacher
#22 Largest Private Schools in Contra Costa County, CA
St. Agnes Elementary School
Parish school · Grades K–8
261 students
Concord, CA
A+Overall grade261 students10 students per teacher
#23 Largest Private Schools in Contra Costa County, CA
Bay Christian School
Assembly of God school · Grades Pre-K–8
255 students
Concord, CA
BOverall grade255 students19 students per teacher
#24 Largest Private Schools in Contra Costa County, CA
St. Perpetua School
Diocesan school · Grades Pre-K–8
248 students
Lafayette, CA
AOverall grade248 students14 students per teacher
From official public records, updated October 2026.