Excellent
#337 of 4,742 schools in NY
Top 7% in state
Robert M Grable JR Mount Sinai High School
High School · Mount Sinai Union Free School District · Mount Sinai, NY
A Mount Sinai Union Free School District high school where students score 17 points above what's typical for similar communities.
110 N COUNTRY RD, Mount Sinai, NY 11766
- Math 98% proficient (2021)
- Reading 67% proficient (2021)
- 95%+ 4-year graduation
Academics
Full Profile · 4/4 metricsView breakdown
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Students at Robert M Grable JR Mount Sinai High School score 82% proficient, which is above what's typical for similar communities (expected: 65%).
2021 EdFacts proficiency
Most recent published year. School vs. NY average.
Trend
↓ DecliningProficiency has fallen 16 points since 2018, to 82% in 2021, across a 13-year record (2009–2021).
Show all 13 years
Multi-year averages used by the rating model: math 96% (multi-year average, 2009-2021) · reading/ELA 92% (multi-year average, 2009-2021)
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Based on 26 test records from NY state assessments and EdFacts (NCES).
Equity & diversity
Shown separately, not included in the overall scoreFree/reduced lunch
11.6%
Students qualifying for federal meal assistance
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
See how we rateThe neighborhood
Where Robert M Grable JR Mount Sinai High School sits, and what the surrounding area looks like.
Nearby same-level schools are colored by their score. Pins are locations, not attendance boundaries. Open the New York map →
Getting around & local context
- Walk 20Car-Dependent
- Bike 28Somewhat Bikeable
- County Safety: Low3/100K
Powered by
FBI Uniform Crime Reporting · 2024 · county context, not school-level safety or attendance eligibility. Source details
Source period: 2024. A newer release may be available.
Area profileU.S. Census ACS 5-year estimates (ACS 2019–2023 5-year estimates)
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%
ACS 2019–2023 5-year estimates for the ZCTA associated with school ZIP 11766; this is area context, not an attendance boundary.
Programs & students
Programs & Offerings
Compare nearby
Nearby same-level schools
4 from a 5-mile search
| School | Score | Grades | Distance | Enrollment | Compare |
|---|---|---|---|---|---|
| Miller Place High SchoolEnrollment path unverified | 8.6 | 9–12 | 2.0 mi | 803 | Compare → |
| Comsewogue High SchoolEnrollment path unverified | 8.3 | 9–12 | 2.2 mi | 1,142 | Compare → |
| Earl L Vandermeulen High SchoolEnrollment path unverified | 9.0 | 9–12 | 2.2 mi | 328 | Compare → |
| Ward Melville Senior High SchoolEnrollment path unverified | 9.2 | 9–12 | 3.0 mi | 1,492 | Compare → |
Distance is proximity only; it is not attendance eligibility.
Enrollment path unverified: Potential public school; its attendance or application path has not been classified.
Mount Sinai Union Free School District
- Schools in district
- 3
- Rank in district
- #1 of 3
- District spending per student
- $29,270NCES F-33 · FY 2023 · This annual source is three years behind the current year.
- District child poverty rate
- 3.0%Census SAIPE · 2024
Robert M Grable JR Mount Sinai High School is listed in MOUNT SINAI UNION FREE SCHOOL DISTRICT; a district label does not verify attendance for an address.
About Robert M Grable JR Mount Sinai High School
Robert M Grable JR Mount Sinai High School is a public high school in Mount Sinai, NY, part of Mount Sinai Union Free School District, serving approximately 700 students in grades 9th-12th with a 11.9:1 student-teacher ratio. It holds a MySchoolScout rating of 8.5 out of 10 and ranks #337 of 4,742 schools in NY. State assessment records show 96% math proficiency (multi-year average, 2009-2021) and 92% reading/ELA proficiency (multi-year average, 2009-2021).
Frequently asked questions
Common questions about Robert M Grable JR Mount Sinai High School
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 #337 of 4,742 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 8.5 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 factsNCES Common Core of Data (CCD) (SY 2023–24)
- Grades
- 9th – 12th
- Enrollment
- 700
- Student-Teacher Ratio
- 11.9:1
- Teachers (FTE)
- 59
- Type
- regular
- Setting
- Large Suburb
- County
- Suffolk County
- Chronic Absenteeism (SY 2022-23)
- 19.6%
- Phone
- (631) 870-2800
- 4-Year Graduation
- 95%+
- Area population (ZIP 11766)
- 11,481
- Area average commute
- 34.3 min
- Area median age
- 47.7
Official sources & links
About this school's data
Every number on this page comes from a published source with a stated period. Where a source is partial, aging, or describes a surrounding area rather than the school, that limitation is named below.
- 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
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