#1 Private Schools with the Smallest Classes in Sonoma County, CA
The Spring Hill School
Independent school · Grades Pre-K–8
4.6 students per teacher
Petaluma, CA
A+Overall grade109 students5 students per teacher
2026 lists
Private Schools with the Smallest Classes in Sonoma County, CA
Private schools in Sonoma County, CA with the fewest students per teacher (not counting preschools and special education schools). Top 21 of 21 schools.
#2 Private Schools with the Smallest Classes in Sonoma County, CA
Quest Forward High School
Independent school · Grades 9–12
6.6 students per teacher
Santa Rosa, CA
B+Overall grade62 students7 students per teacher
#3 Private Schools with the Smallest Classes in Sonoma County, CA
Rio Lindo Adventist Academy
Seventh-day Adventist school · Grades 9–12
6.7 students per teacher
Healdsburg, CA
A+Overall grade113 students7 students per teacher
#4 Private Schools with the Smallest Classes in Sonoma County, CA
Sonoma Country Day School
Independent school · Grades Pre-K–8
6.8 students per teacher
Santa Rosa, CA
A+Overall grade280 students7 students per teacher
#5 Private Schools with the Smallest Classes in Sonoma County, CA
The Healdsburg School
Independent school · Grades K–8
7.7 students per teacher
Healdsburg, CA
B+Overall grade234 students8 students per teacher
#6 Private Schools with the Smallest Classes in Sonoma County, CA
The Presentation School
Independent Catholic school · Grades K–8
8.1 students per teacher
Sonoma, CA
A+Overall grade158 students8 students per teacher
#7 Private Schools with the Smallest Classes in Sonoma County, CA
Summerfield Waldorf School and Farm
Independent school · Grades Pre-K–12
8.5 students per teacher
Santa Rosa, CA
BOverall grade225 students9 students per teacher
#8 Private Schools with the Smallest Classes in Sonoma County, CA
St. Vincent De Paul High School
Parish school · Grades 9–12
9.4 students per teacher
Petaluma, CA
A+Overall grade169 students9 students per teacher
#9 Private Schools with the Smallest Classes in Sonoma County, CA
Pleasant Hill Christian School
Christian school (nondenominational) · Grades K–6
10.1 students per teacher
Sebastopol, CA
B+Overall grade71 students10 students per teacher
#10 Private Schools with the Smallest Classes in Sonoma County, CA
Cardinal Newman High School
Diocesan school · Grades 9–12
10.6 students per teacher
Santa Rosa, CA
A+Overall grade550 students11 students per teacher
#11 Private Schools with the Smallest Classes in Sonoma County, CA
Victory Christian Academy
Christian school (nondenominational) · Grades K–12
12.4 students per teacher
Santa Rosa, CA
B+Overall grade175 students12 students per teacher
#12 Private Schools with the Smallest Classes in Sonoma County, CA
St. Francis Solano School
Parish school · Grades K–8
13.2 students per teacher
Sonoma, CA
A+Overall grade192 students13 students per teacher
#13 Private Schools with the Smallest Classes in Sonoma County, CA
Grace Christian Academy
Christian school (nondenominational) · Grades K–12
14 students per teacher
Santa Rosa, CA
B-Overall grade189 students14 students per teacher
#14 Private Schools with the Smallest Classes in Sonoma County, CA
Redwood Adventist Academy
Seventh-day Adventist school · Grades K–8
14.2 students per teacher
Santa Rosa, CA
AOverall grade98 students14 students per teacher
#15 Private Schools with the Smallest Classes in Sonoma County, CA
Harvest Christian School
Christian school (nondenominational) · Grades Pre-K–8
15 students per teacher
Petaluma, CA
BOverall grade172 students15 students per teacher
#16 Private Schools with the Smallest Classes in Sonoma County, CA
St. Eugene's Cathedral School
Independent Catholic school · Grades K–8
17.4 students per teacher
Santa Rosa, CA
B+Overall grade87 students17 students per teacher
#17 Private Schools with the Smallest Classes in Sonoma County, CA
St. Vincent De Paul Elementary School
Parish school · Grades K–8
18.3 students per teacher
Petaluma, CA
B+Overall grade192 students18 students per teacher
#18 Private Schools with the Smallest Classes in Sonoma County, CA
St. John the Baptist Catholic School
Diocesan school · Grades K–8
21.7 students per teacher
Healdsburg, CA
BOverall grade293 students22 students per teacher
#19 Private Schools with the Smallest Classes in Sonoma County, CA
St. Rose Elementary School
Parish school · Grades Pre-K–8
21.8 students per teacher
Santa Rosa, CA
BOverall grade305 students22 students per teacher
#20 Private Schools with the Smallest Classes in Sonoma County, CA
College Oak Montessori School
Montessori school · Ungraded
31 students per teacher
Santa Rosa, CA
BOverall grade62 students31 students per teacher
#21 Private Schools with the Smallest Classes in Sonoma County, CA
Sonoma Academy
Independent school · Grades 9–12
42.5 students per teacher
Santa Rosa, CA
BOverall grade340 students
From official public records, updated October 2026.