#1 Best Private High Schools in Suffolk County, NY
Ross School
Independent school · Grades Pre-K–12
95% of graduates go to four-year colleges
East Hampton, NY
A+Overall grade286 students5 students per teacher
2026 lists
Best Private High Schools in Suffolk County, NY
Private high schools in Suffolk County, NY with the highest overall grades. Top 7 of 7 schools.
#2 Best Private High Schools in Suffolk County, NY
MDQ Academy
Islamic school · Grades Pre-K–12
100% of graduates go to four-year colleges
Brentwood, NY
AOverall grade276 students9 students per teacher
#3 Best Private High Schools in Suffolk County, NY
St. John the Baptist Diocesan High School
Diocesan school · Grades 9–12
100% of graduates go to four-year colleges
West Islip, NY
AOverall grade969 students15 students per teacher
#4 Best Private High Schools in Suffolk County, NY
St. Anthony's High School
Parish school · Grades 9–12
The only Catholic school in Huntington Station
Huntington Station, NY
B+Overall grade2,435 students19 students per teacher
#5 Best Private High Schools in Suffolk County, NY
The Knox School
Independent school · Grades 6–12
100% of graduates go to four-year colleges
Saint James, NY
B+Overall grade112 students24 students per teacher
#6 Best Private High Schools in Suffolk County, NY
The Stony Brook School
Christian school (nondenominational) · Grades 7–12
89% of graduates go to four-year colleges
Stony Brook, NY
B+Overall grade442 students10 students per teacher
#7 Best Private High Schools in Suffolk County, NY
Smithtown Christian School
Christian school (nondenominational) · Grades K–12
The only Christian school in Smithtown
Smithtown, NY
B-Overall grade385 students10 students per teacher
Grades compare each school's official facts, such as class size, how long it has served families and where graduates go, with similar schools. They're a starting point: visit, ask questions and trust what you see.