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A−

Robert M Grable Jr. Mount Sinai High School

PublicHighGrades 9–12

110 N Country Rd, Mount Sinai, NY 11766 · (631) 870-2800 · Part of Mount Sinai Union Free School District

Brookhaven’s School Grade B better than 62% of New York school districts

Directions
Students
710
Students per teacher
11:1
Free or reduced lunch
12%
Setting
Suburb
Grades
9–12
The gist

What stands out about Robert M Grable Jr. Mount Sinai High School

  • Its own letter, A−: reading and math results near the top of New York’s public schools
  • Math proficiency 41 pts above the state
  • Small classes: 11 students per teacher

Test scores

2020–21
Math proficiency98%
State average 56.1%
Reading / language arts67%
State average 62.6%

Its own letter, A−, places these results among New York’s 4,095 public schools with results. Source: EDFacts via Urban Institute Education Data Portal (SY2020-21).

Location

Directions ↗

110 N Country Rd, Mount Sinai

Students

Enrollment by grade
Grade 9194
Grade 10157
Grade 11161
Grade 12193
Ungraded5
Enrollment over time
760’20
763’21
720’22
700’23
710’24

Down 6.6% since 2020–21.

Who goes here
White 74%Hispanic 14%Asian 9%Two or more races 2%Black 1%Native Hawaiian/Pacific Islander <1%

As reported to NCES, share of students with a reported race or ethnicity.

Parents talk

Questions and answers about Robert M Grable Jr. Mount Sinai High School from Brookhaven families.

Other schools in Mount Sinai Union Free School District

The district →
Mount Sinai Elementary School
Elementary · Grades K–4 · Mount Sinai
B+
657 students12:1
Mount Sinai Middle School
Middle · Grades 5–8 · Mount Sinai
B−
617 students11:1

School facts: U.S. Department of Education (NCES), 2024–2025 school year. Test scores: EDFacts via Urban Institute Education Data Portal (SY2020-21). A school’s letter is our own summary of its reading and math results against New York’s other public schools; Brookhaven’s School Grade is built from its districts’ results. Map: © OpenStreetMap contributors.