The brief
A Mount Sinai Union Free School District high school where students score 10 points above what's typical for similar communities.
It ranks 1,262 of 4,744 schools in New York and 2 of 3 in Mount Sinai Union Free School District.
Robert M Grable JR Mount Sinai High School is listed in Mount Sinai Union Free School District, and a district label does not verify attendance for an address: confirm the zoned campus with the district before you commit to a street.
- 2021*82%
- 2020*82%
- 201998%
- 201898%
- 201798%
- 201698%
* A COVID-affected year: test participation was uneven nationwide, so the model weights it at half.
About this school's data1 correction under review · rating: low confidence · 7 sources, 2019–2024
Every number on this page comes from a published source with a stated period. Where a source is partial, aging, an estimate, or describes a surrounding area rather than the school, that limitation is named here.
Attendance data is under correction. This existing Resources & Environment score and overall rating may still reflect an unverified attendance input.
Full Profile · 4/4 metrics
Multi-year averages used by the rating model: math 96% (multi-year average, 2009-2021) · reading/ELA 92% (multi-year average, 2009-2021).
- School directory (enrollment, grades, staff, contact)
- NCES Common Core of Data (CCD) · SY 2023–24 · Medium confidence
- Source period: SY 2023–24. A newer release may be available.
- MySchoolScout rating and rank
- MySchoolScout ranking model · Low confidence
- Vintage not available. Do not use this measure alone.
- Derived as a weighted blend of the component scores shown in Academics from state assessment, EdFacts growth, and NCES resource records.
- Math proficiency
- State department of education · 2021 EdFacts · Low confidence
- Older source: 2021 EdFacts. Use as historical context.
- Available for part of the eligible units; results may not represent the full area.
- Derived from source records rather than read directly from one field.
- Reading/ELA proficiency
- State department of education · 2021 EdFacts · Low confidence
- Older source: 2021 EdFacts. Use as historical context.
- Available for part of the eligible units; results may not represent the full area.
- Derived from source records rather than read directly from one field.
- Student progress (growth)
- NCES EdFacts · Mixed source periods · Low confidence
- Vintage not available. Do not use this measure alone.
- Available for part of the eligible units; results may not represent the full area.
- Derived as the fitted year-over-year slope of proficiency from multi-year assessment records.
- Neighborhood (income, housing, education)
- U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates · Low confidence
- Older source: ACS 2019–2023 5-year estimates. Use as historical context.
- Reported for the ZCTA for ZIP 11766; this does not measure the attendance area.
- Programs (AP/IB, athletics, gifted)
- CRDC via Urban Institute · SY 2021–22 · Medium confidence
- Available for part of the eligible units; results may not represent the full area.
- Source period: SY 2021–22. A newer release may be available.
Evidence periods: Rating mixed/unknown input periods; assessments multi-year average, 2009-2021; directory SY 2023–24
The neighborhood
Where it sits, and what the area looks like.Open the New York school map to see school quality against home prices across the metro.
The area
- Median income
- $157,564
- Median home value
- $632,900
- Median rent
- $3,183/mo
- College educated
- 51.3%
- Homeownership
- 96.9%
- Poverty rate
- 1.9%
U.S. Census ACS 5-year estimates · ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 11766; this is area context, not an attendance boundary.
Getting around
- Walk Score
- 20
- Car-Dependent
- Bike Score
- 28
- Somewhat Bikeable
Walk, transit and bike scores by
Programs and who goes here
What the campus offers, and who it enrolls.Programs
- AP and IB
- 4 AP courses
- 37.1% participation · state average 2.4 AP courses · CRDC via Urban Institute · SY 2021–22
- Athletics
- 23 sports
- 11 boys' · 12 girls' · 36 teams (incl. JV) · CRDC via Urban Institute · SY 2021–22
- Advanced STEM courses
- 5 of 5
- Algebra II, Advanced Math, Calculus, Chemistry, Physics · CRDC via Urban Institute · SY 2021–22
Who goes here
- Free or reduced lunch
- 11.6%
- Students qualifying for federal meal assistance. Shown separately, never in the score.
NCES Common Core of Data (CCD).
Compare nearby
Grade-compatible schools using the same rating model.- 8.3Compare →
- 8.2Compare →
- 7.7Compare →
- Robert M Grable JR Mount Sinai High School7.4
- 7.4Compare →
- 7.2Compare →
- 6.8Compare →
Distance is proximity only; it is not attendance eligibility.
Enrollment path unverified: Potential public school; its attendance or application path has not been classified.
The record
What is on file, and where each number came from.Questions families ask
What grades does Robert M Grable JR Mount Sinai High School serve?
Robert M Grable JR Mount Sinai High School serves students in grades 9th through 12th.
How many students attend Robert M Grable JR Mount Sinai High School?
Robert M Grable JR Mount Sinai High School has an enrollment of approximately 700 students.
What is the student-teacher ratio at Robert M Grable JR Mount Sinai High School?
The student-teacher ratio at Robert M Grable JR Mount Sinai High School is 11.9:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Robert M Grable JR Mount Sinai High School rank in NY?
Robert M Grable JR Mount Sinai High School ranks #1,262 of 4,744 schools in NY.
What is Robert M Grable JR Mount Sinai High School's MySchoolScout rating?
Robert M Grable JR Mount Sinai High School has a current MySchoolScout rating of 7.4 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at Robert M Grable JR Mount Sinai High School?
Based on loaded state assessment records, Robert M Grable JR Mount Sinai High School has 96% math proficiency (multi-year average, 2009-2021) and 92% reading/ELA proficiency (multi-year average, 2009-2021).
Is Robert M Grable JR Mount Sinai High School a charter school?
No, Robert M Grable JR Mount Sinai High School is not a charter school. It is a traditional public school operated by the local school district.
Is Robert M Grable JR Mount Sinai High School a Title I school?
No, Robert M Grable JR Mount Sinai High School is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Robert M Grable JR Mount Sinai High School?
11.6% of students at Robert M Grable JR Mount Sinai High School qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
School facts
- Grades
- 9th – 12th
- Enrollment
- 700
- Student-teacher ratio
- 11.9:1
- Teachers (FTE)
- 59
- Type
- Regular
- Title I
- No
- Setting
- Large Suburb
- County
- Suffolk County
- Phone
- (631) 870-2800
- 4-year graduation
- 96.0%
- Class of 2023
- Rank in district
- #2 of 3
- Schools in district
- 3
- District spending per student
- $29,270
- NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 3.0%
- Census SAIPE · 2024
- Area population (ZIP 11766)
- 11,481
- Area average commute
- 34.3 min
- Area median age
- 47.7
NCES Common Core of Data (CCD) (SY 2023–24).
Sources and official links
Keep exploring
Related reading
- Best States for Public Schools in 2026: A Complete Rankingdata insights
- Charter Schools vs Public Schools: What the Data Actually Shows (2026)school choice
- The New School Choice Map: Is Your State Participating in the Federal Tuition Tax Credit?data insights
- Student-Teacher Ratio by State: Complete 2026 Rankingsdata insights
Data from NCES Common Core of Data, New York State Education Dept., and U.S. Census ACS for the 2023–24 school year. Rankings computed by MySchoolScout. See all data sources.