Very Good

#136 of 992 private schools in NY

Top 14% of private schools

Our Lady of Mercy Academy

High School

815 CONVENT RD, Syosset, NY 11791

Last updated: July 2026

Private

Enrollment

275

Student-Teacher

6.9:1

Score

7.5

Grades

9th – 12th

Enrollment

275

Student-Teacher

6.9:1

Score

7.5

Grades

9th – 12th

Data vintage
2021-22

Data vintage2021-22

How this school compares

New York private schools

#136 of 992

In Syosset

#1 of 2

public schools

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About Our Lady of Mercy Academy

Our Lady of Mercy Academy is a private high school in Syosset, NY. Our Lady of Mercy Academy serves approximately 275 students, and covers grades 9th-12th, and has a 6.9:1 student-teacher ratio. Our Lady of Mercy Academy has a current MySchoolScout rating of 7.5 out of 10 and ranks #136 of 992 private schools in NY.

How it compares0.5 pts above NY schools

7.5

This school 7.5 · Very Good
NY avg 7.0

What Parents Should Know

At 6.9:1 students to teachers, Our Lady of Mercy Academy sits well below the national average. Smaller classes like that usually mean more one-on-one time between students and teachers.

Our Lady of Mercy Academy is private, so it runs independently of the local district and sets its own curriculum. That freedom cuts both ways depending on what you want for your child. If you're considering it, start with the practical questions: tuition, financial aid, and how admissions work.

Compare to Public Schools

Beta

How Our Lady of Mercy Academy compares to the 10 public schools in Syosset, NY

Student-Teacher Ratio

6.9:1

This School

9.6:1

Public Avg

Avg School Size

275

This School

688

Public Avg

Avg School Scout Rating

7.5

This School

8.3

Public Avg

Student Demographics

White 75.3% vs 0%

Hispanic 12% vs 0%

Asian 5.5% vs 0%

Black 3.3% vs 0%

Our Lady of Mercy Academy Syosset Public Avg

All Schools in Syosset

School	Distance	Enrollment	STR	Rating
Our Lady of Mercy Academy (this school)	—	275	6.9:1	7.5
PS 256	0.3 mi	538	4.6:1	4.1
SYOSSET SENIOR HIGH SCHOOL	0.4 mi	2,370	10.4:1	9.2
SOUTH WOODS MIDDLE SCHOOL	0.6 mi	785	9.7:1	8.7
VILLAGE ELEMENTARY SCHOOL	0.7 mi	408	10.2:1	8.7
BERRY HILL ELEMENTARY SCHOOL	0.9 mi	454	11.9:1	9.0
H B THOMPSON MIDDLE SCHOOL	1.4 mi	955	9.6:1	8.7
WILLITS ELEMENTARY SCHOOL	1.5 mi	301	8.9:1	8.2
SOUTH GROVE ELEMENTARY SCHOOL	2.0 mi	405	9.9:1	8.6
WEST SIDE SCHOOL	2.2 mi	191	9.6:1	9.3
ROBBINS LANE ELEMENTARY SCHOOL	2.6 mi	469	11.4:1	8.8

Demographics sourced from NCES Private School Survey (PSS) and Common Core of Data (CCD). Comparisons are based on enrollment-weighted averages.

Score Breakdown

Preliminary

What This Rating Measures

This rating reflects classroom size, instructional time, student diversity, community resources, and school characteristics. Private schools are ranked against other private schools in NY.

Classroom Attention

A- 7.7 / 10

View breakdown

Student-Teacher Ratio 6.9:1

Instructional Commitment

A- 7.5 / 10

View breakdown

School Day Length 7 hours

Annual Instructional Hours 1,260

Diversity & Inclusion

B+ 6.8 / 10

View breakdown

Diversity Index 41%

Community Context

Data Unavailable

School Profile

A- 8.1 / 10

View breakdown

Enrollment 275

View data sources

Score basis: Private school model

Data coverage: 80% of scoring components had data

Components scored: 4 of 5

Ranking pool: Private schools in NY

Test Scores

Test score data not yet available for this school.

Student Demographics NCES PSS (SY 2021-22)

White 75.3%

Hispanic 12.0%

Asian 5.5%

Black 3.3%

Two or More 2.9%

Native American 0.7%

Pacific Islander 0.4%

Source: NCES Private School Survey (PSS)

Location

815 CONVENT RD, Syosset, NY 11791

Nearby Alternatives

Families considering Our Lady of Mercy Academy may also want to explore other high schools in the area. SYOSSET SENIOR HIGH SCHOOL (rated 9.2/10, 0.4 miles away), which scores notably higher. Another option is FUSION ACADEMY WOODBURY NY (rated 6.8/10, 1.0 miles away, in nearby Woodbury), with a comparable rating. Additionally, CRESTWOOD COUNTRY DAY SCHOOL (rated 3.6/10, 2.7 miles away, in nearby Melville), a more accessible option. For more schools in Syosset, see our Syosset schools guide .

Nearby Schools

20 within 2.7 mi

School	Distance	Enrollment	Rating
PS 256 Syosset	0.3 mi	538	4.1
SYOSSET SENIOR HIGH SCHOOL Syosset	0.4 mi	2,370	9.2
SOUTH WOODS MIDDLE SCHOOL Syosset	0.6 mi	785	8.7
THE CENTER FOR DEVELOPMENTAL DISABILITIES Woodbury	0.6 mi	102	7.2
VILLAGE ELEMENTARY SCHOOL Syosset	0.7 mi	408	8.7
BERRY HILL ELEMENTARY SCHOOL Syosset	0.9 mi	454	9.0
FUSION ACADEMY WOODBURY NY Woodbury	1.0 mi	74	6.8
ST EDWARD CONFESSOR SCHOOL Syosset	0.9 mi	162	6.7
WALT WHITMAN ELEMENTARY SCHOOL Woodbury	1.0 mi	398	8.8
H B THOMPSON MIDDLE SCHOOL Syosset	1.4 mi	955	8.7
WILLITS ELEMENTARY SCHOOL Syosset	1.5 mi	301	8.2
JUDY JACOBS PARKWAY ELEMENTARY SCHOOL Plainview	2.0 mi	437	9.1
BAYLIS ELEMENTARY SCHOOL Plainview	2.1 mi	422	8.6
SOUTH GROVE ELEMENTARY SCHOOL Syosset	2.0 mi	405	8.6
WEST SIDE SCHOOL Syosset	2.2 mi	191	9.3
EAST WOODS SCHOOL Oyster Bay	2.4 mi	135	7.6
STRATFORD ROAD SCHOOL Plainview	2.8 mi	596	9.2
HEBREW ACADEMY OF NASSAU-PLAINVIEW CAMPUS Plainview	2.8 mi	99	7.3
PLAINVIEW-OLD BETHPAGE MIDDLE SCHOOL Plainview	2.9 mi	918	8.6
CRESTWOOD COUNTRY DAY SCHOOL Melville	2.7 mi	163	3.6

Neighborhood Census ACS (2019-2023)

Census data for ZIP 11791 (ACS 2019-2023 5-Year Estimates) · Data sources

Median Income

$204,357

Median Home Value

$918,900

Median Rent

$3,091/mo

Population

25,194

College Educated

70.6%

Homeownership

92.8%

Avg Commute

39.5 min

Poverty Rate

3.5%

Median Age

Similar Schools

Schools in the same state with comparable level, size, and ratings

School	Enrollment	Rating
ACADEMY FOR HEALTH CAREERS Brooklyn, NY	198	7.5
ACADEMY OF THE HOLY NAMES Albany, NY	196	7.5
BELMONT PREPARATORY HIGH SCHOOL Bronx, NY	365	7.5
CARDINAL O'HARA HIGH SCHOOL Tonawanda, NY	167	7.5
FORESTVILLE CENTRAL HIGH SCHOOL Forestville, NY	192	7.5
HIGH SCHOOL FOR PUBLIC SERVICE-HEROES OF TOMORROW Brooklyn, NY	379	7.5

Frequently Asked Questions

Common questions about Our Lady of Mercy Academy

What grades does Our Lady of Mercy Academy serve?

Our Lady of Mercy Academy serves students in grades 9th through 12th.

How many students attend Our Lady of Mercy Academy?

Our Lady of Mercy Academy has an enrollment of approximately 275 students.

What is the student-teacher ratio at Our Lady of Mercy Academy?

The student-teacher ratio at Our Lady of Mercy Academy is 6.9:1. A lower ratio generally means more individual attention per student. The national average is approximately 11:1 for private schools.

How does Our Lady of Mercy Academy rank in NY?

Our Lady of Mercy Academy ranks #136 of 992 private schools in NY.

What is Our Lady of Mercy Academy's MySchoolScout rating?

Our Lady of Mercy Academy has a current MySchoolScout rating of 7.5 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.

Is Our Lady of Mercy Academy a private school?

Yes, Our Lady of Mercy Academy is a private all-girls school with a Roman Catholic affiliation. Private schools are not required to participate in state standardized testing, so academic performance data may be limited compared to public schools.

Is Our Lady of Mercy Academy a religious school?

Our Lady of Mercy Academy has a Roman Catholic religious affiliation.

Explore More Schools

All schools in Syosset, NY Schools in NY 20 nearby schools Explore New York school quality map

11 schools nearby View map →

Neighborhood Context

Walk Score: 19 Car-Dependent
Bike Score: 20 Somewhat Bikeable

Quick Facts NCES PSS (SY 2021-22)

Grades: 9th – 12th
Enrollment: 275
Gender Split: 0% M / 100% F
Student-Teacher Ratio: 6.9:1
Teachers (FTE): 40
Type: private
Coed Status: all-girls
Affiliation: Roman Catholic
School Day: 7 hours
Days Per Year: 180 days
Setting: Large Suburb
County: Nassau County
Phone: (516) 921-1047

Resources & Links

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Data sources

NCES PSSSY 2021-22 Census ACS2019-2023 MySchoolScout Rankings2024 Full details →

Our Lady of Mercy Academy

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