#1 Best Private Schools in Nassau County, NY
Our Lady of Mercy Academy
Independent Catholic school · Grades 9–12
The only all-girls school in Syosset
Syosset, NY
A+Overall gradeAll girls195 students7 students per teacher
2026 lists
Best Private Schools in Nassau County, NY
Private schools in Nassau County, NY with the highest overall grades. Top 50 of 54 schools.
#2 Best Private Schools in Nassau County, NY
Lawrence Woodmere Academy
Independent school · Grades Pre-K–12
The only independent school in Woodmere
Woodmere, NY
A+Overall grade114 students3 students per teacher
#3 Best Private Schools in Nassau County, NY
The Waldorf School of Garden City
Independent school · Grades Pre-K–12
100% of graduates go to four-year colleges
Garden City, NY
A+Overall grade238 students6 students per teacher
#4 Best Private Schools in Nassau County, NY
St. Brigid/Our Lady of Hope Regional School
Diocesan school · Grades Pre-K–8
The only Catholic school in Westbury
Westbury, NY
A+Overall grade182 students10 students per teacher
#5 Best Private Schools in Nassau County, NY
St. Edward Confessor School
Parish school · Grades Pre-K–8
Smaller classes than 80% of Catholic schools in New York
Syosset, NY
A+Overall grade150 students8 students per teacher
#6 Best Private Schools in Nassau County, NY
Brookville Center for Childrens Services Edu #10
Special education school · Pre-K only
Smaller classes than 86% of preschools in New York
Glen Head, NY
A+Overall grade174 students5 students per teacher
#7 Best Private Schools in Nassau County, NY
Grace Christian Academy
Baptist school · Grades K–12
One of the most diverse private schools in New York
Merrick, NY
A+Overall grade143 students7 students per teacher
#8 Best Private Schools in Nassau County, NY
East Woods School
Independent school · Grades Pre-K–8
The only independent school in Oyster Bay
Oyster Bay, NY
A+Overall grade133 students3 students per teacher
#9 Best Private Schools in Nassau County, NY
St. Mary's High School
Parish school · Grades 9–12
The largest Catholic school in Manhasset
Manhasset, NY
A+Overall grade329 students13 students per teacher
#10 Best Private Schools in Nassau County, NY
Sacred Heart Academy
Diocesan school · Grades 9–12
100% of graduates go to four-year colleges
Hempstead, NY
A+Overall gradeAll girls677 students14 students per teacher
#11 Best Private Schools in Nassau County, NY
Progressive School of Long Island
Alternative school · Grades K–8
Smaller classes than 73% of independent schools in New York
Merrick, NY
A+Overall grade63 students4 students per teacher
#12 Best Private Schools in Nassau County, NY
Notre Dame School
Diocesan school · Grades Pre-K–8
Serving families in New Hyde Park since at least 2011
New Hyde Park, NY
A+Overall grade267 students12 students per teacher
#13 Best Private Schools in Nassau County, NY
St. Aidan Upper School
Parish school · Grades 3–8
Smaller classes than 92% of Catholic schools in New York
Williston Park, NY
A+Overall grade166 students6 students per teacher
#14 Best Private Schools in Nassau County, NY
Our Lady of Victory School
Parish school · Grades Pre-K–8
Serving families in Floral Park since at least 2011
Floral Park, NY
A+Overall grade279 students13 students per teacher
#15 Best Private Schools in Nassau County, NY
Rambam Mesivta Maimonides HS
Jewish day school · Grades 9–12
100% of graduates go to four-year colleges
Lawrence, NY
A+Overall gradeAll boys180 students7 students per teacher
#16 Best Private Schools in Nassau County, NY
Hebrew Academy of Five Towns & Rockaway
Jewish day school · Grades Pre-K–12
The largest Jewish school in Lawrence
Lawrence, NY
A+Overall grade1,119 students6 students per teacher
#17 Best Private Schools in Nassau County, NY
The Greenvale School
Independent school · Grades Pre-K–8
Small classes: about 6 students per teacher
Old Brookville, NY
A+Overall grade355 students6 students per teacher
#18 Best Private Schools in Nassau County, NY
St. Rose of Lima Elementary School
Parish school · Grades Pre-K–8
Smaller classes than 64% of Catholic schools in New York
Massapequa, NY
A+Overall grade250 students10 students per teacher
#19 Best Private Schools in Nassau County, NY
Fusion Academy Woodbury NY
Independent school · Grades 6–12
Smaller classes than 96% of independent schools in New York
Woodbury, NY
AOverall grade65 students2 students per teacher
#20 Best Private Schools in Nassau County, NY
St. Martin De Porres Marianist School
Independent Catholic school · Grades Pre-K–8
One of 2 Catholic schools in Uniondale
Uniondale, NY
AOverall grade298 students12 students per teacher
#21 Best Private Schools in Nassau County, NY
Portledge School
Independent school · Grades Pre-K–12
100% of graduates go to four-year colleges
Locust Valley, NY
AOverall grade518 students8 students per teacher
#22 Best Private Schools in Nassau County, NY
Magen Israel-Gan Israel Center
Jewish day school · Grades Pre-K–7
Smaller classes than 60% of Jewish day schools in New York
Great Neck, NY
AOverall grade74 students8 students per teacher
#23 Best Private Schools in Nassau County, NY
St. Anne's School
Parish school · Grades Pre-K–8
Serving families in Garden City since at least 2011
Garden City, NY
A-Overall grade323 students14 students per teacher
#24 Best Private Schools in Nassau County, NY
North Shore Hebrew Academy
Jewish day school · Grades Pre-K–12
The largest Jewish school in Great Neck
Great Neck, NY
A-Overall grade1,116 students6 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.