#1 Largest Private Schools in San Luis Obispo County, CA
Coastal Christian School
Christian school (nondenominational) · Grades K–12
409 students
Pismo Beach, CA
B-Overall grade409 students15 students per teacher
2026 lists
Largest Private Schools in San Luis Obispo County, CA
The private schools in San Luis Obispo County, CA with the most students. Top 13 of 13 schools.
#2 Largest Private Schools in San Luis Obispo County, CA
San Luis Obispo Classical Academy
Independent school · Grades Pre-K–12
337 students
San Luis Obispo, CA
BOverall grade337 students16 students per teacher
#3 Largest Private Schools in San Luis Obispo County, CA
Mission College Prep Catholic High School
Diocesan school · Grades 9–12
330 students
San Luis Obispo, CA
A+Overall grade330 students11 students per teacher
#4 Largest Private Schools in San Luis Obispo County, CA
Old Mission School
Parish school · Grades K–8
294 students
San Luis Obispo, CA
A+Overall grade294 students14 students per teacher
#5 Largest Private Schools in San Luis Obispo County, CA
St. Patricks Catholic School
Parish school · Grades Pre-K–8
247 students
Arroyo Grande, CA
B+Overall grade247 students20 students per teacher
#6 Largest Private Schools in San Luis Obispo County, CA
St. Rose Catholic School
Diocesan school · Grades Pre-K–8
220 students
Paso Robles, CA
BOverall grade220 students18 students per teacher
#7 Largest Private Schools in San Luis Obispo County, CA
Trinity Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
170 students
Paso Robles, CA
B-Overall grade170 students16 students per teacher
#8 Largest Private Schools in San Luis Obispo County, CA
Wishing Well School
Independent school · Grades Pre-K–8
128 students
Los Osos, CA
BOverall grade128 students9 students per teacher
#9 Largest Private Schools in San Luis Obispo County, CA
North County Christian School
Christian school (nondenominational) · Grades Pre-K–8
106 students
Atascadero, CA
AOverall grade106 students10 students per teacher
#10 Largest Private Schools in San Luis Obispo County, CA
Childrens House Montessori School
Montessori school · Grades Pre-K–6
70 students
Atascadero, CA
B+Overall grade70 students10 students per teacher
#11 Largest Private Schools in San Luis Obispo County, CA
Montessori Childrens School
Montessori school · Grades Pre-K–6
58 students
San Luis Obispo, CA
B+Overall grade58 students12 students per teacher
#12 Largest Private Schools in San Luis Obispo County, CA
Valley View Adventist Junior Academy
Seventh-day Adventist school · Grades K–8
55 students
Arroyo Grande, CA
A+Overall grade55 students10 students per teacher
#13 Largest Private Schools in San Luis Obispo County, CA
Santa Lucia School
Alternative school · Grades K–8
48 students
Templeton, CA
AOverall grade48 students6 students per teacher
From official public records, updated October 2026.