ROBERT M GRABLE JR MOUNT SINAI HIGH SCHOOL
Public
High Grades 9–12
Part of MOUNT SINAI UNION FREE SCHOOL DISTRICT
110 N COUNTRY RD, MOUNT SINAI, NY 11766 · (631) 870-2800
Community ratings
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Academic performance
Math proficiency97.5%
State average 56.1%
Reading / language arts67%
State average 62.6%
EDFacts via Urban Institute Education Data Portal (SY2020-21)
At a glance
710Students enrolled
11:1Student–teacher ratio
12%Free / reduced lunch
SuburbSetting
Regular SchoolSchool type
Enrollment by grade
Grade 9194
Grade 10157
Grade 11161
Grade 12193
Ungraded5
Students
White · 74%524
Hispanic · 14%100
Asian · 9%63
Two or more races · 2%13
Black · 1%9
Native Hawaiian/Pacific Islander · 0%1
Counts as reported to NCES; percentages are of students with a reported race/ethnicity.
Enrollment · last 5 years
760’20
763’21
720’22
700’23
710’24
Location
110 N COUNTRY RD MOUNT SINAI
Neighbor reviews
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School facts from the U.S. Department of Education (NCES), 2024-2025 school year. Academic scores from the EDFacts via Urban Institute Education Data Portal (SY2020-21). Community ratings and reviews reflect neighbor opinions, not an official measure of school quality.