#1 Largest Private Schools in Western Connecticut County, CT
The Greenwich Country Day School
Independent school · Grades Pre-K–12
1,315 students
Greenwich, CT
BOverall grade1,315 students8 students per teacher
2026 lists
Largest Private Schools in Western Connecticut County, CT
The private schools in Western Connecticut County, CT with the most students. Top 37 of 37 schools.
#2 Largest Private Schools in Western Connecticut County, CT
Greenwich Academy
Independent school · Grades Pre-K–12
802 students
Greenwich, CT
A+Overall gradeAll girls802 students7 students per teacher
#3 Largest Private Schools in Western Connecticut County, CT
Sacred Heart Greenwich
Diocesan school · Grades Pre-K–12
588 students
Greenwich, CT
B-Overall gradeAll girls588 students22 students per teacher
#4 Largest Private Schools in Western Connecticut County, CT
New Canaan Country School
Independent school · Grades Pre-K–9
493 students
New Canaan, CT
B-Overall grade493 students8 students per teacher
#5 Largest Private Schools in Western Connecticut County, CT
Canterbury School
Independent Catholic school · Grades 8–12
406 students
New Milford, CT
A+Overall grade406 students6 students per teacher
#6 Largest Private Schools in Western Connecticut County, CT
Immaculate High School
Diocesan school · Grades 9–12
375 students
Danbury, CT
A+Overall grade375 students12 students per teacher
#7 Largest Private Schools in Western Connecticut County, CT
Wooster School
Episcopal school · Grades 5–12
310 students
Danbury, CT
A+Overall grade310 students7 students per teacher
#8 Largest Private Schools in Western Connecticut County, CT
Greenwich Catholic School
Diocesan school · Grades Pre-K–8
294 students
Greenwich, CT
A+Overall grade294 students10 students per teacher
#9 Largest Private Schools in Western Connecticut County, CT
Catholic Academy of Stamford
Independent Catholic school · Grades Pre-K–8
255 students
Stamford, CT
BOverall grade255 students14 students per teacher
#10 Largest Private Schools in Western Connecticut County, CT
Eagle Hill School
Special education school · Grades 1–9
254 students
Greenwich, CT
AOverall grade254 students5 students per teacher
#11 Largest Private Schools in Western Connecticut County, CT
Whitby School
Montessori school · Grades Pre-K–8
253 students
Greenwich, CT
A+Overall grade253 students3 students per teacher
#12 Largest Private Schools in Western Connecticut County, CT
St. Peter School
Diocesan school · Grades Pre-K–8
245 students
Danbury, CT
BOverall grade245 students14 students per teacher
#13 Largest Private Schools in Western Connecticut County, CT
St. Gregory the Great School
Parish school · Grades Pre-K–8
244 students
Danbury, CT
BOverall grade244 students18 students per teacher
#14 Largest Private Schools in Western Connecticut County, CT
St. Rose of Lima School
Diocesan school · Grades Pre-K–8
227 students
Newtown, CT
B-Overall grade227 students19 students per teacher
#15 Largest Private Schools in Western Connecticut County, CT
Mater Salvatoris College Preparatory School
Independent Catholic school · Grades Pre-K–8
200 students
Stamford, CT
A+Overall grade200 students6 students per teacher
#16 Largest Private Schools in Western Connecticut County, CT
St. Mary School
Diocesan school · Grades Pre-K–8
194 students
Ridgefield, CT
A+Overall grade194 students8 students per teacher
#17 Largest Private Schools in Western Connecticut County, CT
Waterside School
Independent school · Grades Pre-K–5
162 students
Stamford, CT
A+Overall grade162 students4 students per teacher
#18 Largest Private Schools in Western Connecticut County, CT
St. Mary Elementary School
Diocesan school · Grades Pre-K–8
150 students
Bethel, CT
AOverall grade150 students13 students per teacher
#19 Largest Private Schools in Western Connecticut County, CT
Winston Preparatory School
Special education school · Grades 5–12
143 students
Norwalk, CT
A+Overall grade143 students3 students per teacher
#20 Largest Private Schools in Western Connecticut County, CT
Cardinal Kung Academy
Diocesan school · Grades 7–12
117 students
Stamford, CT
A+Overall grade117 students8 students per teacher
#21 Largest Private Schools in Western Connecticut County, CT
Pierrepont School
Independent school · Grades K–12
114 students
Westport, CT
A+Overall grade114 students3 students per teacher
#22 Largest Private Schools in Western Connecticut County, CT
The Greenwich Japanese School
Independent school · Grades 1–9
112 students
Riverside, CT
B+Overall grade112 students6 students per teacher
#23 Largest Private Schools in Western Connecticut County, CT
The Children's School
Montessori school · Grades K–2
100 students
Stamford, CT
BOverall grade100 students8 students per teacher
#24 Largest Private Schools in Western Connecticut County, CT
Anchor Academy DBA Regina Pacis Academy
Independent Catholic school · Grades Pre-K–8
96 students
Norwalk, CT
A+Overall grade96 students9 students per teacher
From official public records, updated October 2026.