[+] Show Closed Private Schools in Suffolk County, New York

Overview

Academics and Faculty:

# Teachers

1,434 Teachers

41,688 Teachers

Average Student-Teacher Ratio

11:1

10:1

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Showing 2016–2025. Full 11-year historical data available below ↓

Student-Teacher Ratio Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	11:1	10:1	11:1
2024	11:1	10:1	11:1
2023	12:1	11:1	11:1
2022	12:1	11:1	11:1
2021	12:1	11:1	11:1
2020	12:1	11:1	12:1
2019	12:1	11:1	12:1
2018	12:1	11:1	12:1
2017	12:1	11:1	12:1
2016	13:1	11:1	12:1
2015	14:1	12:1	12:1

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% Average Faculty w/Advanced Degree

90%

75%

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Showing 2016–2025. Full 11-year historical data available below ↓

Percentage of Faculty With Advanced Degrees Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	89%	76%	55%
2024	89%	75%	54%
2023	88%	75%	54%
2022	84%	76%	54%
2021	80%	74%	54%
2020	81%	74%	54%
2019	78%	73%	53%
2018	77%	73%	53%
2017	79%	72%	53%
2016	82%	73%	52%
2015	79%	72%	52%

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Average Class Size

14 students

15 students

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Showing 2016–2025. Full 11-year historical data available below ↓

Class Size Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	14	15	15
2024	14	15	15
2023	14	15	15
2022	14	15	15
2021	14	15	15
2020	14	15	15
2019	15	16	15
2018	15	16	15
2017	15	16	15
2016	14	16	15
2015	14	16	15

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Average Number of AP Courses

15 courses

12 courses

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Showing 2016–2025. Full 11-year historical data available below ↓

Trends in Average Number of AP Courses Offered
Year	Suffolk County Average	New York (NY) Average	National Average
2025	13	11	13
2024	13	10	12
2023	13	10	11
2022	11	10	11
2021	10	10	11
2020	9	10	11
2019	10	10	11
2018	10	9	11
2017	9	9	10
2016	8	9	10
2015	9	9	10

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Average SAT score

1263

(Out of 1600)

1261

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SAT Score Trends (2017-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	1261	1250	1233
2024	1261	1246	1230
2023	1236	1242	1228
2022	1236	1246	1229
2021	1236	1247	1229
2020	1287	1240	1226
2019	1189	1235	1226
2018	1187	1224	1226
2017	1345	1236	1233

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Average ACT score

(Out of 36)

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ACT Score Trends (2023-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	28	28	26
2024	28	28	26
2023	28	28	26

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Tuition and Acceptance Rate:

Average Yearly Tuition Cost

$19,516

$21,768

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Showing 2016–2025. Full 11-year historical data available below ↓

Tuition Cost Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	$20,283	$22,300	$15,012
2024	$20,484	$21,665	$14,622
2023	$20,127	$20,985	$14,057
2022	$19,211	$20,180	$13,504
2021	$19,360	$19,711	$13,232
2020	$18,564	$19,389	$12,915
2019	$17,362	$18,863	$12,656
2018	$19,554	$18,453	$12,363
2017	$19,029	$17,834	$12,049
2016	$17,831	$17,228	$11,633
2015	$17,286	$16,414	$11,174

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Average Summer Program Cost

$1,314

$2,323

Average % on Financial Aid

21%

34%

View Data

Showing 2016–2025. Full 11-year historical data available below ↓

Percent on Financial Aid Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	21%	34%	34%
2024	21%	33%	34%
2023	21%	34%	34%
2022	22%	34%	33%
2021	23%	33%	33%
2020	22%	33%	32%
2019	21%	32%	31%
2018	22%	32%	30%
2017	22%	31%	30%
2016	23%	31%	29%
2015	26%	30%	28%

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Average Financial Aid Grant

$7,021

$10,886

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Showing 2016–2025. Full 11-year historical data available below ↓

Financial Aid Grant Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	$4,140	$9,504	$7,073
2024	$4,157	$9,775	$6,930
2023	$4,350	$10,192	$6,469
2022	$4,557	$9,153	$6,289
2021	$1,801	$8,840	$6,055
2020	$4,216	$8,813	$5,921
2019	$5,006	$8,764	$5,795
2018	$5,838	$7,563	$5,456
2017	$5,433	$6,602	$5,319
2016	$5,433	$6,842	$5,105
2015	$6,806	$6,353	$5,030

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Average Acceptance Rate

80%

79%

View Data

Showing 2016–2025. Full 11-year historical data available below ↓

Acceptance Rate Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	73%	74%	81%
2024	83%	79%	85%
2023	82%	79%	85%
2022	82%	78%	85%
2021	83%	78%	85%
2020	81%	78%	85%
2019	81%	77%	85%
2018	81%	77%	85%
2017	82%	79%	85%
2016	86%	80%	85%
2015	87%	81%	85%

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Average Endowment Size

$10.57 million

$31.78 million

Students by Ethnicity:

0.69

0.59

View Data

Showing 2016–2025. Full 11-year historical data available below ↓

Diversity Score Trends
Year	Suffolk County Average	New York (NY) Average	National Average
2025	0.69	0.60	0.65
2024	0.69	0.60	0.65
2023	0.68	0.62	0.65
2022	0.67	0.62	0.64
2021	0.67	0.62	0.64
2020	0.67	0.62	0.64
2019	0.65	0.61	0.63
2018	0.65	0.61	0.63
2017	0.61	0.61	0.61
2016	0.61	0.62	0.61
2015	0.61	0.62	0.61

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# American Indian Students

15 Students

949 Students

% American Indian Students

<1%

# Asian Students

732 Students

18,397 Students

% Asian Students

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Showing 2016–2025. Full 11-year historical data available below ↓

Asian Student Percentage Trends
Year	Suffolk County Average	New York (NY) Average	National Average
2025	5%	4%	5%
2024	5%	4%	5%
2023	6%	4%	5%
2022	7%	5%	4%
2021	8%	5%	4%
2020	8%	4%	4%
2019	5%	5%	4%
2018	5%	5%	4%
2017	3%	4%	4%
2016	3%	4%	4%
2015	4%	4%	4%

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# Hispanic Students

2,028 Students

33,759 Students

% Hispanic Students

13%

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Showing 2016–2025. Full 11-year historical data available below ↓

Hispanic Student Percentage Trends
Year	Suffolk County Average	New York (NY) Average	National Average
2025	13%	8%	9%
2024	13%	8%	9%
2023	12%	9%	9%
2022	10%	9%	8%
2021	10%	9%	9%
2020	10%	9%	9%
2019	9%	10%	8%
2018	9%	10%	8%
2017	7%	9%	8%
2016	7%	9%	8%
2015	7%	9%	8%

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# Black Students

1,184 Students

33,696 Students

% Black Students

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Showing 2016–2025. Full 11-year historical data available below ↓

Black Student Percentage Trends
Year	Suffolk County Average	New York (NY) Average	National Average
2025	7%	8%	7%
2024	7%	8%	7%
2023	9%	9%	8%
2022	9%	9%	7%
2021	8%	9%	7%
2020	8%	9%	8%
2019	8%	9%	7%
2018	8%	9%	7%
2017	7%	11%	7%
2016	7%	11%	7%
2015	7%	11%	8%

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# White Students

7,348 Students

252,994 Students

% White Students

47%

60%

View Data

Showing 2016–2025. Full 11-year historical data available below ↓

White Student Percentage Trends
Year	Suffolk County Average	New York (NY) Average	National Average
2025	46%	59%	52%
2024	45%	59%	52%
2023	49%	57%	52%
2022	52%	57%	54%
2021	51%	57%	54%
2020	51%	58%	54%
2019	53%	58%	56%
2018	52%	58%	56%
2017	56%	58%	58%
2016	56%	58%	58%
2015	55%	58%	58%

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# Hawaiian Students

20 Students

538 Students

% Hawaiian Students

<1%

# Others Students

4,407 Students

81,171 Students

% of Others Students

28%

19%

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Showing 2016–2025. Full 11-year historical data available below ↓

Other Races Student Percentage Trends
Year	Suffolk County Average	New York (NY) Average	National Average
2025	29%	20%	26%
2024	30%	20%	26%
2023	24%	20%	25%
2022	22%	18%	25%
2021	23%	19%	25%
2020	23%	19%	24%
2019	25%	18%	24%
2018	26%	18%	23%
2017	27%	18%	22%
2016	27%	18%	22%
2015	27%	18%	21%

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All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars

11 extracurriculars

13 extracurriculars

Average Number of Sports

7 sports

Frequently Asked Questions

What are the top ranked private schools in Suffolk County, NY?

The private schools in Suffolk County, NY include The Knox School, The Stony Brook School, and St. Anthony's High School.

How many private schools are located in Suffolk County?

81 private schools are located in Suffolk County.

How much do private schools cost in Suffolk County?

The average tuition cost is $19,516, which is lower than the New York private school average tuition cost of $21,768.

How diverse are private schools in Suffolk County?

Suffolk County private schools are approximately 34% minority students, which is lower than the New York private school average of 39%.

What percentage of students in Suffolk County go to private school?

7% of all K-12 students in Suffolk County are educated in private schools (compared to the NY state average of 14%).

What percentage of private schools are religiously affiliated in Suffolk County?

40% of private schools in Suffolk County are religiously affiliated (most commonly Catholic and Christian).

Which private schools in Suffolk County are often viewed compared to one another?

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