#1 Largest Private Schools in Connecticut
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 Connecticut
The private schools in Connecticut with the most students. Top 50 of 204 schools.
#2 Largest Private Schools in Connecticut
Choate Rosemary Hall
Independent school · Grades 9–12
842 students
Wallingford, CT
AOverall grade842 students7 students per teacher
#3 Largest Private Schools in Connecticut
Greenwich Academy
Independent school · Grades Pre-K–12
802 students
Greenwich, CT
A+Overall gradeAll girls802 students7 students per teacher
#4 Largest Private Schools in Connecticut
Fairfield College Preparatory
Independent Catholic school · Grades 9–12
787 students
Fairfield, CT
BOverall gradeAll boys787 students17 students per teacher
#5 Largest Private Schools in Connecticut
St. Joseph High School
Diocesan school · Grades 9–12
741 students
Trumbull, CT
B+Overall grade741 students14 students per teacher
#6 Largest Private Schools in Connecticut
The Loomis Chaffee School
Independent school · Grades 9–12
735 students
Windsor, CT
BOverall grade735 students8 students per teacher
#7 Largest Private Schools in Connecticut
Hamden Hall Country Day School
Independent school · Grades Pre-K–12
621 students
Hamden, CT
B+Overall grade621 students10 students per teacher
#8 Largest Private Schools in Connecticut
The Hotchkiss School
Independent school · Grades 9–12
602 students
Lakeville, CT
A+Overall grade602 students6 students per teacher
#9 Largest Private Schools in Connecticut
Sacred Heart Greenwich
Diocesan school · Grades Pre-K–12
588 students
Greenwich, CT
B-Overall gradeAll girls588 students22 students per teacher
#10 Largest Private Schools in Connecticut
Yeshiva K'tana of Waterbury
Jewish day school · Grades Pre-K–8
583 students
Waterbury, CT
BOverall grade583 students6 students per teacher
#11 Largest Private Schools in Connecticut
Kent School
Episcopal school · Grades 9–12
516 students
Kent, CT
A+Overall grade516 students8 students per teacher
#12 Largest Private Schools in Connecticut
Kingswood Oxford School
Independent school · Grades 6–12
506 students
West Hartford, CT
BOverall grade506 students8 students per teacher
#13 Largest Private Schools in Connecticut
Notre Dame Catholic High School
Diocesan school · Grades 9–12
500 students
Fairfield, CT
A-Overall grade500 students17 students per teacher
#14 Largest Private Schools in Connecticut
Holy Cross High School
Independent Catholic school · Grades 9–12
495 students
Waterbury, CT
B+Overall grade495 students13 students per teacher
#15 Largest Private Schools in Connecticut
New Canaan Country School
Independent school · Grades Pre-K–9
493 students
New Canaan, CT
B-Overall grade493 students8 students per teacher
#16 Largest Private Schools in Connecticut
Notre Dame High School
Independent Catholic school · Grades 9–12
471 students
West Haven, CT
A+Overall gradeAll boys471 students12 students per teacher
#17 Largest Private Schools in Connecticut
East Catholic High School
Diocesan school · Grades 9–12
427 students
Manchester, CT
A+Overall grade427 students10 students per teacher
#18 Largest Private Schools in Connecticut
The Foote School
Independent school · Grades K–9
426 students
New Haven, CT
A+Overall grade426 students4 students per teacher
#19 Largest Private Schools in Connecticut
Westminster School
Independent school · Grades 9–12
414 students
Simsbury, CT
BOverall grade414 students7 students per teacher
#20 Largest Private Schools in Connecticut
Suffield Academy
Independent school · Grades 9–12
413 students
Suffield, CT
A+Overall grade413 students6 students per teacher
#21 Largest Private Schools in Connecticut
Christian Heritage School
Christian school (nondenominational) · Grades K–12
407 students
Trumbull, CT
AOverall grade407 students12 students per teacher
#22 Largest Private Schools in Connecticut
Canterbury School
Independent Catholic school · Grades 8–12
406 students
New Milford, CT
A+Overall grade406 students6 students per teacher
#23 Largest Private Schools in Connecticut
Northwest Catholic High School
Diocesan school · Grades 9–12
401 students
West Hartford, CT
A+Overall grade401 students11 students per teacher
#24 Largest Private Schools in Connecticut
St. Bernard School
Diocesan school · Grades 6–12
388 students
Uncasville, CT
B+Overall grade388 students13 students per teacher
From official public records, updated October 2026.