#1 Largest Private Schools in Napa County, CA
Justin-Siena
Independent Catholic school · Grades 9–12
654 students
Napa, CA
A+Overall grade654 students14 students per teacher
2026 lists
Largest Private Schools in Napa County, CA
The private schools in Napa County, CA with the most students. Top 10 of 10 schools.
#2 Largest Private Schools in Napa County, CA
St. Apollinaris School
Diocesan school · Grades Pre-K–8
332 students
Napa, CA
BOverall grade332 students21 students per teacher
#3 Largest Private Schools in Napa County, CA
St. John's Lutheran School
Lutheran (Missouri Synod) school · Grades Pre-K–8
227 students
Napa, CA
BOverall grade227 students15 students per teacher
#4 Largest Private Schools in Napa County, CA
St. Helena Montessori School and Farm
Independent Catholic school · Grades Pre-K–12
198 students
Saint Helena, CA
A+Overall grade198 students7 students per teacher
#5 Largest Private Schools in Napa County, CA
Blue Oak School
Alternative school · Grades Pre-K–8
186 students
Napa, CA
AOverall grade186 students8 students per teacher
#6 Largest Private Schools in Napa County, CA
Veritas Christian Academy
Christian school (nondenominational) · Grades Pre-K–8
124 students
Napa, CA
A+Overall grade124 students10 students per teacher
#7 Largest Private Schools in Napa County, CA
Pacific Union College Elementary School
Seventh-day Adventist school · Grades K–8
71 students
Angwin, CA
AOverall grade71 students12 students per teacher
#8 Largest Private Schools in Napa County, CA
Calvary Baptist Christian Academy
Baptist school · Grades Pre-K–11
63 students
American Canyon, CA
AOverall grade63 students
#9 Largest Private Schools in Napa County, CA
Puc Preparatory School
Seventh-day Adventist school · Grades 9–12
57 students
Angwin, CA
A+Overall grade57 students10 students per teacher
#10 Largest Private Schools in Napa County, CA
Sunrise Montessori of Napa Valley
Montessori school · Grades Pre-K–5
42 students
Napa, CA
AOverall grade42 students3 students per teacher
From official public records, updated October 2026.