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

Overview

Academics and Faculty:

# Teachers

1,434 Teachers

41,517 Teachers

Average Student-Teacher Ratio

11:1

10:1

View Data

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%

76%

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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

View Data

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

13 courses

11 courses

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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)

1253

View Data

SAT Score Trends (2015-2025)
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
2016	1552	1324	1306
2015	1528	1270	1258

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Average ACT score

(Out of 36)

View Data

ACT Score Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	28	28	26
2024	28	28	26
2023	28	28	26
2022	27	27	26
2021	27	27	26
2020	24	27	25
2019	25	27	25
2018	24	26	25
2017	25	26	25
2016	23	26	25
2015	24	25	25

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Tuition and Acceptance Rate:

Average Yearly Tuition Cost

$21,272

$22,435

View Data

Tuition Cost Trends (2015-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	$20,283	$22,300	$15,012
2024	$15,857	$21,636	$13,254
2023	$19,422	$21,117	$12,626
2022	$14,436	$19,707	$12,187
2021	$13,233	$19,162	$11,800
2020	$13,215	$18,832	$11,512
2019	$12,360	$18,073	$11,293
2018	$13,920	$17,784	$11,017
2017	$13,438	$16,583	$10,708
2016	$12,483	$14,881	$10,356
2015	$12,624	$14,120	$9,939

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Average Summer Program Cost

$1,314

$2,359

View Data

Summer Program Cost Trends (2019-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	$1,707	$2,213	$1,152
2024	$1,111	$2,240	$1,128
2023	$1,111	$2,493	$1,156
2022	$1,750	$2,022	$1,102
2021	$1,750	$2,090	$1,125
2020	$2,000	$2,178	$1,217
2019	$2,000	$1,781	$1,305

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Average % on Financial Aid

21%

33%

View Data

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

$6,799

$9,892

View Data

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

73%

76%

View Data

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

$26.34 million

$48.84 million

View Data

Endowment Trends (2020-2025)
Year	Suffolk County Average	New York (NY) Average	National Average
2025	$26 M	$48 M	$60 M
2024	$10 M	$29 M	$59 M
2023	$20 M	$28 M	$71 M
2022	$19 M	$24 M	$76 M
2021	$16 M	$24 M	$71 M
2020	$16 M	$22 M	$74 M

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Students by Ethnicity:

0.69

0.59

View Data

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

n/a

# Asian Students

732 Students

18,397 Students

% Asian Students

View Data

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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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

View Data

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

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

n/a

# Two or more races Students

n/a

% of Two or more races Students

n/a

# Others Students

4,407 Students

81,467 Students

% of Others Students

28%

19%

View Data

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

12 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 Ross School, The Knox School, and St. John The Baptist Diocesan 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 $21,272, which is lower than the New York private school average tuition cost of $22,435.

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 15%).

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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Quick Facts (2026)

Quick Facts (2026)

Top Ranked Suffolk County Private Schools (2026)

Suffolk County Private Schools (Closed)

Overview

Trends in Total Number of Private Schools

Trends in the Average Number of Students Per Private School

Percentage of Students of Color Trends (2015-2025)

Academics and Faculty:

Student-Teacher Ratio Trends (2015-2025)

Percentage of Faculty With Advanced Degrees Trends (2015-2025)

Class Size Trends (2015-2025)

Trends in Average Number of AP Courses Offered

SAT Score Trends (2015-2025)

ACT Score Trends (2015-2025)

Tuition and Acceptance Rate:

Tuition Cost Trends (2015-2025)

Summer Program Cost Trends (2019-2025)

Percent on Financial Aid Trends (2015-2025)

Financial Aid Grant Trends (2015-2025)

Acceptance Rate Trends (2015-2025)

Endowment Trends (2020-2025)

Students by Ethnicity:

Diversity Score Trends

Asian Student Percentage Trends

Hispanic Student Percentage Trends

Black Student Percentage Trends

White Student Percentage Trends

Other Races Student Percentage Trends

Extracurriculars and Sports:

Frequently Asked Questions

Recent Articles

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Trends in the Average Number of Students Per Private School
Year	Suffolk County Average	New York (NY) Average	National Average
2025	201	246	179
2024	200	238	172
2023	194	238	174
2022	212	250	185
2021	206	245	180
2020	201	242	171
2019	209	247	175
2018	207	245	172
2017	225	242	180
2016	226	241	178
2015	217	230	167

Best Suffolk County Private Schools (2026)

Top Ranked Suffolk County Private Schools (2026)

Suffolk County Private Schools (Closed)

Overview

Trends in Total Number of Private Schools

Trends in the Average Number of Students Per Private School

Percentage of Students of Color Trends (2015-2025)

Academics and Faculty:

Student-Teacher Ratio Trends (2015-2025)

Percentage of Faculty With Advanced Degrees Trends (2015-2025)

Class Size Trends (2015-2025)

Trends in Average Number of AP Courses Offered

SAT Score Trends (2015-2025)

ACT Score Trends (2015-2025)

Tuition and Acceptance Rate:

Tuition Cost Trends (2015-2025)

Summer Program Cost Trends (2019-2025)

Percent on Financial Aid Trends (2015-2025)

Financial Aid Grant Trends (2015-2025)

Acceptance Rate Trends (2015-2025)

Endowment Trends (2020-2025)

Students by Ethnicity:

Diversity Score Trends

Asian Student Percentage Trends

Hispanic Student Percentage Trends

Black Student Percentage Trends

White Student Percentage Trends

Other Races Student Percentage Trends

Extracurriculars and Sports:

Frequently Asked Questions

More Articles