#1 Largest Private Schools in Buffalo, NY
St. Josephs Collegiate Institute
Independent Catholic school · Grades 9–12
647 students
Buffalo, NY
B+Overall gradeAll boys647 students14 students per teacher
2026 lists
Largest Private Schools in Buffalo, NY
The private schools in Buffalo, NY with the most students. Top 11 of 11 schools.
#2 Largest Private Schools in Buffalo, NY
Nichols School
Independent school · Grades 5–12
582 students
Buffalo, NY
BOverall grade582 students8 students per teacher
#3 Largest Private Schools in Buffalo, NY
Stanley G Falk School
Special education school · Grades K–12
554 students
Buffalo, NY
BOverall grade554 students5 students per teacher
#4 Largest Private Schools in Buffalo, NY
Notre Dame Academy
Diocesan school · Grades Pre-K–8
376 students
Buffalo, NY
BOverall grade376 students14 students per teacher
#5 Largest Private Schools in Buffalo, NY
St. Mark School
Diocesan school · Grades Pre-K–8
362 students
Buffalo, NY
AOverall grade362 students11 students per teacher
#6 Largest Private Schools in Buffalo, NY
Bishop Timon-St. Jude High School
Independent Catholic school · Grades 9–12
279 students
Buffalo, NY
AOverall gradeAll boys279 students11 students per teacher
#7 Largest Private Schools in Buffalo, NY
Darul Uloom Al Madania
Islamic school · Grades Pre-K–11
277 students
Buffalo, NY
B+Overall grade277 students11 students per teacher
#8 Largest Private Schools in Buffalo, NY
Mount St. Mary Academy
Independent Catholic school · Grades 9–12
216 students
Buffalo, NY
A+Overall gradeAll girls216 students8 students per teacher
#9 Largest Private Schools in Buffalo, NY
Mount Mercy Academy
Independent Catholic school · Grades 9–12
180 students
Buffalo, NY
A+Overall gradeAll girls180 students8 students per teacher
#10 Largest Private Schools in Buffalo, NY
Catholic Academy West Buffalo
Diocesan school · Grades Pre-K–8
170 students
Buffalo, NY
A+Overall grade170 students11 students per teacher
#11 Largest Private Schools in Buffalo, NY
Buffalo Seminary
Independent school · Grades 9–12
149 students
Buffalo, NY
A+Overall gradeAll girls149 students6 students per teacher
From official public records, updated October 2026.