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Robert M Grable Junior Mount Sinai High School

Public Grades 9-12

23^rd

SchoolDigger Rank ?

of 1,234 New York High Schools

Better than 98% of New York high schools

Summary

Robert M Grable Junior Mount Sinai High School is a public high school serving around 700 students in grades 9-12 in Mount Sinai, New York. The school is part of the Mount Sinai Union Free School District, which is ranked 148 out of 874 school districts in the state and has a 4-star rating.

Robert M Grable Junior Mount Sinai High School is an exceptional educational institution, consistently ranking among the top 2-18% of high schools in New York state over the past decade. The school's academic performance is exceptional, with students scoring significantly higher than state averages on Regents exams across a wide range of subjects. Its 4-year graduation rate is very high, ranging from 84.3% to 97.3% in recent years, and its dropout rate is correspondingly low, between 0.5% and 4.9%. When compared to nearby high schools like Sachem High School North, Sachem High School East, and Longwood High School, Robert M Grable Junior Mount Sinai High School consistently outperforms them on key metrics.

The school's exceptional performance extends across all student subgroups, with the school ranking in the top 5-11% of New York high schools for female students, male students, Asian students, Hispanic students, white students, special education students, and low socioeconomic status students. This suggests a strong commitment to equity and inclusion, and the school's high spending per student, low student-teacher ratio, and strong district support may be contributing factors to its success.

710

Students ?

10.9

Student/teacher ratio ?

$31,514

Per pupil spending ?

12.3%

Free/discounted lunch ?

110 N Country Rd
Mount Sinai, NY 11766-0398

(631) 870-2800

District: Mount Sinai Union Free School District

Feeder schools for Robert M Grable Junior Mount Sinai High School:

Elementary:	Mount Sinai Elementary School
Middle:	Mount Sinai Middle School

Racial breakdown:

White:

73.8%

Hispanic:

14.1%

Asian:

8.9%

See top rated New York high schools

Compare Robert M Grable Junior Mount Sinai High School to nearby high schools!

At a glance

▲ Ranking trend: Improving — 92nd percentile in 2014 → 98th in 2025

Strengths

✓Test scores above the New York average (95% vs 67% meeting standards)

✓Ranks in the top 2% of New York high schools

✓97% graduate in 4 years — above the New York average (83%)

Students meeting standards (2024-2025) ?

This school95%

District avg95%

New York avg67%

23^rd of 1,234

New York public high schools ?

Top 2%▲ up 15 pts since 2015

From top 17% (2015) to top 2% (2025)

See the entire ranking list of New York High Schools →

★★★★★

SchoolDigger rating ?

148^th of 874Mount Sinai Union Free School District among New York districts

Statewide rank percentile over time (100 = the top-ranked school in the state; click a legend item to add a student group)

Show full rank history (all student groups)

All Students

Year	Avg score	Statewide rank	New York percentile	Rating
2025	88.5	23 of 1234	98.1%	★★★★★
2024	84.7	40 of 1242	96.8%	★★★★★
2023	85.2	40 of 1228	96.7%	★★★★★
2022	81.7	81 of 1190	93.2%	★★★★★
2019	83.1	42 of 1207	96.5%	★★★★★
2018	82.7	43 of 1210	96.4%	★★★★★
2017	82.8	72 of 1221	94.1%	★★★★★
2016	73.4	168 of 1255	86.6%	★★★★☆
2015	70.4	212 of 1255	83.1%	★★★★☆
2014	77.4	96 of 1237	92.2%	★★★★★
2013	79.7	93 of 1217	92.4%	★★★★★
2012	78.5	103 of 1198	91.4%	★★★★★
2011	77.7	76 of 1165	93.5%	★★★★★
2010	77.9	56 of 1117	95.0%	★★★★★
2009	77.1	58 of 1086	94.7%	★★★★★
2008	77.6	38 of 1027	96.3%	★★★★★
2007	75.7	71 of 1002	92.9%	★★★★★
2006	76.2	54 of 986	94.5%	★★★★★
2005	75.7	62 of 935	93.4%	★★★★★

Asian

Year	Avg score	Statewide rank	New York percentile	Rating
2025	77.5	52 of 413	87.4%	★★★★☆
2024	80.0	24 of 426	94.4%	★★★★★
2023	79.1	41 of 424	90.3%	★★★★★
2022	77.4	48 of 386	87.6%	★★★★☆
2019	79.1	16 of 447	96.4%	★★★★★
2018	74.7	71 of 426	83.3%	★★★★☆

Female

Year	Avg score	Statewide rank	New York percentile	Rating
2025	87.5	32 of 1206	97.3%	★★★★★
2024	84.5	40 of 1219	96.7%	★★★★★
2023	85.4	37 of 1197	96.9%	★★★★★
2022	81.5	79 of 1155	93.2%	★★★★★
2019	83.1	34 of 1193	97.2%	★★★★★
2018	81.1	60 of 1176	94.9%	★★★★★

Hispanic

Year	Avg score	Statewide rank	New York percentile	Rating
2025	91.3	24 of 885	97.3%	★★★★★
2024	90.0	25 of 865	97.1%	★★★★★
2023	90.5	22 of 851	97.4%	★★★★★
2022	85.2	48 of 760	93.7%	★★★★★
2019	91.2	8 of 815	99.0%	★★★★★
2018	87.7	26 of 791	96.7%	★★★★★

Low Socio Economic Status

Year	Avg score	Statewide rank	New York percentile	Rating
2025	86.6	24 of 1179	98.0%	★★★★★
2024	80.7	65 of 1170	94.4%	★★★★★
2023	77.2	101 of 1155	91.3%	★★★★★
2022	78.3	83 of 1101	92.5%	★★★★★
2019	87.1	18 of 1179	98.5%	★★★★★
2018	78.9	66 of 1154	94.3%	★★★★★

Male

Year	Avg score	Statewide rank	New York percentile	Rating
2025	88.3	21 of 1201	98.3%	★★★★★
2024	84.6	36 of 1211	97.0%	★★★★★
2023	84.3	42 of 1191	96.5%	★★★★★
2022	80.6	87 of 1154	92.5%	★★★★★
2019	81.8	58 of 1190	95.1%	★★★★★
2018	82.7	42 of 1176	96.4%	★★★★★

Special Education

Year	Avg score	Statewide rank	New York percentile	Rating
2025	96.7	11 of 1149	99.0%	★★★★★
2024	90.7	42 of 1144	96.3%	★★★★★
2023	91.8	38 of 1130	96.6%	★★★★★
2022	89.0	48 of 1038	95.4%	★★★★★
2019	93.6	25 of 1132	97.8%	★★★★★
2018	89.5	54 of 1095	95.1%	★★★★★

White

Year	Avg score	Statewide rank	New York percentile	Rating
2025	82.6	26 of 788	96.7%	★★★★★
2024	78.5	45 of 781	94.2%	★★★★★
2023	77.6	61 of 776	92.1%	★★★★★
2022	73.3	102 of 738	86.2%	★★★★☆
2019	76.4	59 of 793	92.6%	★★★★★
2018	76.5	65 of 765	91.5%	★★★★★

How student groups rank statewide ? (each group's percentile vs the same group at other schools — higher is better; the +/- beside each compares the group with this school's overall percentile)

Special Education (2025)99th percentile~ school

Male (2025)98th percentile~ school

Low Socio Economic Status (2025)98th percentile~ school

Female (2025)97th percentile~ school

Hispanic (2025)97th percentile~ school

White (2025)97th percentile~ school

Asian (2025)87th percentile-11 vs school

By subject vs New York (2024-2025) ?

Common Core Algebra II99%+24 vs state

U.S. History and Government99%+24 vs state

Global History and Geography98%+22 vs state

Geometry97%+37 vs state

Algebra I97%+41 vs state

Common Core English Language Arts96%+21 vs state

Living Environment94%+37 vs state

Chemistry89%+25 vs state

Earth Science89%+24 vs state

Physics80%+11 vs state

Common Core Geometry40%+16 vs state

★

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Schools Near Robert M Grable Junior Mount Sinai High School

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Immunizations Finance All

School													Students/Teachers											Ranking (2025)				Ranking (2024)				Regents Chemistry (2025)	Regents Common Core Algebra II (2025)	Regents Common Core English Language Arts (2025)	Regents Common Core Geometry (2025)	Regents Earth Science (2025)	Regents Global History and Geography (2025)	Regents Living Environment (2025)	Regents Physics (2025)	Regents U.S. History and Government (2025)	Regents Algebra I (2025)	Regents Life Science Biology (2025)	Regents Geometry (2025)	Regents Earth and Space Sciences (2025)	% Completely Immunized (2020)	% Polio (2020)	% Measles (2020)	% Mumps (2020)	% Rubella (2020)	% Diphtheria (2020)	% Hepatitis B (2020)	% Varicella (2020)	Per Pupil Expenditures (2025)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/Discounted Lunch Recipients	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	SchoolDigger Rating (2025)	Average Standard Score (2024)	Statewide Rank (2024)	State Percentile (2024)	Rank Change from Previous Year	Regents Chemistry End of Course	Regents Common Core Algebra II End of Course	Regents Common Core English Language Arts End of Course	Regents Common Core Geometry End of Course	Regents Earth Science End of Course	Regents Global History and Geography End of Course	Regents Living Environment End of Course	Regents Physics End of Course	Regents U.S. History and Government End of Course	Regents Algebra I End of Course	Regents Life Science Biology End of Course	Regents Geometry End of Course	Regents Earth and Space Sciences End of Course	% Completely Immunized All Grades	% Polio All Grades	% Measles All Grades	% Mumps All Grades	% Rubella All Grades	% Diphtheria All Grades	% Hepatitis B All Grades	% Varicella All Grades	Per Pupil Expenditures Total	Sub-total from Federal Funds	Sub-total from State/Local Funds
Robert M Grable Junior Mount Sinai High School	Public	9-12	110 N Country Rd	Mount Sinai	11766	Suffolk County	Mount Sinai Union Free School District	No	No	No	Yes	(631) 870-2800	710	65	10.9	12.3%	524 (73.8%)	9 (1.3%)	100 (14.1%)	63 (8.9%)	0 (0.0%)	1 (0.1%)	13 (1.8%)	88.5	23^rd of 1234 public high schools	98.1%		84.7	40^th of 1242 public high schools	96.8%	17	89.3	99.2	96.5	40.0	88.7	98.1	94.0	80.0	98.8	97.1		97.2		99.2	99.4	99.7	99.7	99.7	100.0	100.0	99.9	$31,514	$606	$30,908
Miller Place High School	Public	9-12	15 Memorial Dr	Miller Place	11764	Suffolk County	Miller Place Union Free School District	No	No	No	Yes	(631) 474-2723	764	67	11.4	20.0%	617 (80.8%)	20 (2.6%)	92 (12.0%)	22 (2.9%)	0 (0.0%)	0 (0.0%)	12 (1.6%)	79	165^th of 1234 public high schools	86.6%		77.8	174^th of 1242 public high schools	86.0%	9	80.8	94.4	91.5	25.0	53.2	91.4	88.5	64.4	93.6	76.0		92.4		99.3	99.6	99.6	99.6	99.6	99.8	99.8	99.5	$34,211	$170	$34,041
Comsewogue High School	Public	9-12	565 Bicycle Path	Port Jefferson Station	11776	Suffolk County	Brookhaven-Comsewogue Union Free School District	No	No	No	Yes	(631) 474-8182	1,160	92	12.5	27.9%	602 (51.9%)	66 (5.7%)	424 (36.6%)	42 (3.6%)	2 (0.2%)	0 (0.0%)	24 (2.1%)	69.3	350^th of 1234 public high schools	71.6%		62.8	476^th of 1242 public high schools	61.7%	126	56.1	90.9	91.4	18.4	82.1	86.1	77.0	45.5	89.2	64.0		62.3		98.2	98.8	99.8	99.8	100.0	98.7	99.0	99.8	$31,179	$324	$30,855
Earl L Vandermeulen High School	Public	9-12	350 Old Post Rd	Port Jefferson	11777	Suffolk County	Port Jefferson Union Free School District	No	No	No	No	(631) 791-4421	313	35	8.9	15.0%	237 (75.7%)	8 (2.6%)	36 (11.5%)	25 (8.0%)	0 (0.0%)	0 (0.0%)	7 (2.2%)	80	150^th of 1234 public high schools	87.8%		79.9	126^th of 1242 public high schools	89.9%	24	85.3	83.3	94.1	50.0	95.1	91.6	94.8	53.3	89.7	78.3		76.9		99.4	99.4	99.4	99.4	99.4	99.4	99.4	99.4	$116,055	$274	$115,781
Ward Melville Senior High School	Public	9-12	380 Old Town Rd	East Setauket	11733	Suffolk County	Three Village Central School District	No	No	No	No	(631) 730-4900	1,442	138	10.4	15.7%	998 (69.2%)	36 (2.5%)	141 (9.8%)	228 (15.8%)	1 (0.1%)	0 (0.0%)	38 (2.6%)	85.2	54^th of 1234 public high schools	95.6%		83.7	56^th of 1242 public high schools	95.5%	2	92.7	97.2	94.0	86.4	38.9	95.8	83.4	88.7	98.5	56.2				97.1	99.5	99.3	99.3	99.3	99.6	99.5	97.8	$41,865	$474	$41,392
Rocky Point High School	Public	9-12	82 Rocky Pt-Yaphank Rd	Rocky Point	11778	Suffolk County	Rocky Point Union Free School District	No	No	No	No	(631) 849-7505	894	73	12.3	31.1%	639 (71.5%)	21 (2.3%)	188 (21.0%)	15 (1.7%)	0 (0.0%)	1 (0.1%)	30 (3.4%)	72.1	289^th of 1234 public high schools	76.6%		73.2	283^rd of 1242 public high schools	77.2%	6	81.4	83.3	90.1	27.8	86.0	90.5	68.2	76.5	95.7	71.0		54.8		98.7	99.4	99.7	99.7	99.7	99.5	99.7	99.7	$37,581	$962	$36,619
Newfield High School	Public	9-12	145 Marshall Dr	Selden	11784	Suffolk County	Middle Country Central School District	No	No	No	No	(631) 285-8300	1,553	104	14.9	45.1%	693 (44.6%)	144 (9.3%)	512 (33.0%)	154 (9.9%)	1 (0.1%)	0 (0.0%)	49 (3.2%)	57.8	545^th of 1234 public high schools	55.8%		61.7	494^th of 1242 public high schools	60.2%	51	45.5	79.5	86.7	29.2	20.7	85.6	44.9	77.8	86.0	36.3		61.5	51.0	99.1	99.2	99.9	99.9	99.9	99.7	99.5	99.9	$26,581	$637	$25,944
Centereach High School	Public	8-12	14 43rd St	Centereach	11720	Suffolk County	Middle Country Central School District	No	No	No	No	(631) 285-8100	1,467	107	13.6	43.3%	745 (50.8%)	89 (6.1%)	475 (32.4%)	117 (8.0%)	0 (0.0%)	2 (0.1%)	39 (2.7%)	60.4	504^th of 1234 public high schools	59.2%		67.1	404^th of 1242 public high schools	67.5%	100	74.5	93.0	85.5	20.7	14.0	83.2	51.5	90.0	88.2	45.2		61.6	41.4	99.1	99.1	99.7	99.7	99.7	99.2	99.3	99.5	$29,171	$657	$28,514
Sachem High School East	Public	9-12	177 Granny Rd	Farmingville	11738	Suffolk County	Sachem Central School District	No	No	No	Yes	(631) 716-8200	1,984	154	12.8	34.1%	1,246 (62.8%)	92 (4.6%)	474 (23.9%)	111 (5.6%)	6 (0.3%)	3 (0.2%)	51 (2.6%)	69.9	332^nd of 1234 public high schools	73.1%		67.8	384^th of 1242 public high schools	69.1%	52	75.3	87.5	88.5	40.0	61.1	84.2	87.9	76.9	83.7	60.8		69.7		99.3	99.6	99.6	99.6	99.6	99.7	99.6	99.7	$29,550	$627	$28,923
Longwood High School	Public	9-12	100 Longwood Rd	Middle Island	11953	Suffolk County	Longwood Central School District	No	No	No	Yes	(631) 345-9200	2,993	220	13.5	35.7%	1,212 (40.5%)	593 (19.8%)	913 (30.5%)	94 (3.1%)	7 (0.2%)	9 (0.3%)	164 (5.5%)	62.3	473^rd of 1234 public high schools	61.7%		58	553^rd of 1242 public high schools	55.5%	80	81.8	90.4	89.0	41.9	15.9	82.2	32.0	66.1	82.2	53.0	80.3	66.1	44.2	99.4	99.6	99.9	99.9	99.9	99.7	99.7	99.9	$33,416	$1,288	$32,128

Frequently Asked Questions about Robert M Grable Junior Mount Sinai High School

How many students attend Robert M Grable Junior Mount Sinai High School?

In the 2024-25 school year, 710 students attended Robert M Grable Junior Mount Sinai High School.

Is Robert M Grable Junior Mount Sinai High School a good school?

Yes! Robert M Grable Junior Mount Sinai High School is one of the best high schools in the state. It ranks 23^rd of 1234 New York high schools.

What district is Robert M Grable Junior Mount Sinai High School in?

Mount Sinai Union Free School District

What schools feed into Robert M Grable Junior Mount Sinai High School?

Robert M Grable Junior Mount Sinai High School is fed by the following schools:

Elementary : Mount Sinai Elementary School
Middle : Mount Sinai Middle School

What is the racial makeup of Robert M Grable Junior Mount Sinai High School?

Students at Robert M Grable Junior Mount Sinai High School are 74% White, 14% Hispanic, 9% Asian, 2% Two or more races, 1% African American.

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SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau, the WNYC and the New York State Department of Health and the NY State Education Department.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.