[+] Show Closed Private Schools in Marin County, California

Marin County Private Schools (Closed)

Caulbridge School

Gr: PK-8 | 192 students

Avg. class size: 14 students

Specialized Curriculum

1 St Vincent Drive

San Rafael, CA 94903

(415) 481-1243

(9)

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The Marin School

Gr: 9-12 | 76 students

Avg. class size: 8 students

150 N. San Pedro Road

San Rafael, CA 94903

(415) 339-9336

(3)

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Real School

Gr: 7-8 | 4 students

Alternative School

102 Eye St

San Rafael, CA 94901

(415) 383-7573

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Ring Mountain School

Gr: K-8 | 99 students

70 Lomita Dr

Mill Valley, CA 94941

(415) 381-8183

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Sparrow Creek School

Gr: PK-K | 23 students

Montessori School

304 Caledonia St

Sausalito, CA 94965

(415) 324-7000

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Overview

Academics and Faculty:

# Teachers

1,073 Teachers

55,641 Teachers

Average Student-Teacher Ratio

8:1

12:1

View Data

Student-Teacher Ratio Trends (2015-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	8:1	12:1	11:1
2024	8:1	12:1	11:1
2023	9:1	12:1	11:1
2022	8:1	12:1	11:1
2021	8:1	13:1	11:1
2020	9:1	13:1	12:1
2019	9:1	12:1	12:1
2018	9:1	12:1	12:1
2017	8:1	13:1	12:1
2016	8:1	13:1	12:1
2015	9:1	13:1	12:1

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% Average Faculty w/Advanced Degree

51%

59%

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Percentage of Faculty With Advanced Degrees Trends (2015-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	51%	59%	55%
2024	49%	58%	54%
2023	51%	58%	54%
2022	55%	59%	54%
2021	51%	59%	54%
2020	55%	58%	54%
2019	55%	58%	53%
2018	51%	58%	53%
2017	51%	58%	53%
2016	49%	57%	52%
2015	60%	57%	52%

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Average Class Size

16 students

17 students

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Class Size Trends (2015-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	16	17	15
2024	15	17	15
2023	15	17	15
2022	16	17	15
2021	16	17	15
2020	17	17	15
2019	17	17	15
2018	17	17	15
2017	17	17	15
2016	17	17	15
2015	16	17	15

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Average Number of AP Courses

31 courses

15 courses

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Trends in Average Number of AP Courses Offered
Year	Marin County Average	California (CA) Average	National Average
2025	31	15	13
2024	18	14	12
2023	20	13	11
2022	18	13	11
2021	23	13	11
2020	23	13	11
2019	23	13	11
2018	23	13	11
2017	15	12	10
2016	8	12	10
2015	15	11	10

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Tuition and Acceptance Rate:

Average Yearly Tuition Cost

$28,461

$18,350

View Data

Tuition Cost Trends (2015-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	$28,139	$18,076	$15,012
2024	$29,731	$17,195	$13,254
2023	$27,780	$16,660	$12,626
2022	$26,753	$15,979	$12,187
2021	$25,498	$15,298	$11,800
2020	$23,927	$14,748	$11,512
2019	$23,927	$14,369	$11,293
2018	$22,509	$13,813	$11,017
2017	$21,850	$13,422	$10,708
2016	$18,842	$12,852	$10,356
2015	$17,519	$11,932	$9,939

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Average Summer Program Cost

$3,200

$1,062

View Data

Summer Program Cost Trends (2019-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	$4,050	$1,044	$1,152
2024	$4,050	$999	$1,128
2023	$4,050	$1,039	$1,156
2022	$2,981	$934	$1,102
2021	$2,921	$815	$1,125
2020	$65	$882	$1,217
2019	$65	$928	$1,305

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Average % on Financial Aid

28%

29%

View Data

Percent on Financial Aid Trends (2015-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	28%	29%	34%
2024	29%	29%	34%
2023	30%	29%	34%
2022	30%	28%	33%
2021	29%	28%	33%
2020	26%	28%	32%
2019	26%	27%	31%
2018	25%	27%	30%
2017	24%	27%	30%
2016	25%	26%	29%
2015	24%	25%	28%

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Average Financial Aid Grant

$13,988

$9,066

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Financial Aid Grant Trends (2015-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	$13,988	$8,932	$7,073
2024	$17,366	$8,712	$6,930
2023	$14,616	$8,186	$6,469
2022	$12,868	$8,205	$6,289
2021	$10,930	$7,081	$6,055
2020	$11,134	$6,794	$5,921
2019	$11,134	$6,413	$5,795
2018	$10,829	$5,977	$5,456
2017	$10,829	$5,752	$5,319
2016	$9,079	$5,279	$5,105
2015	$8,947	$5,100	$5,030

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Average Acceptance Rate

79%

80%

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Acceptance Rate Trends (2015-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	76%	80%	81%
2024	75%	84%	85%
2023	81%	84%	85%
2022	74%	84%	85%
2021	74%	84%	85%
2020	81%	84%	85%
2019	79%	84%	85%
2018	81%	84%	85%
2017	80%	85%	85%
2016	79%	84%	85%
2015	77%	84%	85%

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Average Endowment Size

$27.1 million

$31.26 million

View Data

Endowment Trends (2017-2025)
Year	Marin County Average	California (CA) Average	National Average
2025	$27 M	$31 M	$39 M
2024	$5 M	$17 M	$39 M
2023	$5 M	$16 M	$39 M
2022	$4 M	$18 M	$40 M
2021	$4 M	$17 M	$40 M
2020	$4 M	$16 M	$40 M
2019	$4 M	$15 M	$40 M
2018	$3 M	$12 M	$43 M
2017	$3 M	$16 M	$45 M

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Students by Ethnicity:

0.60

0.74

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Diversity Score Trends
Year	Marin County Average	California (CA) Average	National Average
2025	0.60	0.74	0.65
2024	0.60	0.74	0.65
2023	0.58	0.74	0.65
2022	0.55	0.73	0.64
2021	0.54	0.73	0.64
2020	0.55	0.73	0.64
2019	0.54	0.73	0.63
2018	0.55	0.73	0.63
2017	0.56	0.72	0.61
2016	0.55	0.72	0.61
2015	0.54	0.72	0.61

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# American Indian Students

133 Students

3,575 Students

% American Indian Students

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Percentage of Private School Students of American Indian Trends
Year	Marin County Average	California (CA) Average	National Average
2025	3%	1%	1%
2024	2%	1%	1%
2023	2%	1%	1%
2022	2%	1%	2%
2021	3%	1%	1%
2020	3%	1%	1%
2019	2%	2%	1%
2018	2%	1%	2%
2017	2%	1%	1%
2016	2%	1%	1%
2015	2%	2%	1%

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# Asian Students

327 Students

71,780 Students

% Asian Students

11%

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Asian Student Percentage Trends
Year	Marin County Average	California (CA) Average	National Average
2025	4%	11%	5%
2024	4%	11%	5%
2023	4%	11%	5%
2022	3%	10%	4%
2021	3%	10%	4%
2020	3%	10%	4%
2019	4%	10%	4%
2018	4%	10%	4%
2017	4%	10%	4%
2016	4%	10%	4%
2015	3%	10%	4%

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# Hispanic Students

684 Students

104,409 Students

% Hispanic Students

16%

View Data

Hispanic Student Percentage Trends
Year	Marin County Average	California (CA) Average	National Average
2025	8%	16%	9%
2024	8%	16%	9%
2023	8%	16%	9%
2022	7%	16%	8%
2021	7%	16%	9%
2020	7%	16%	9%
2019	8%	16%	8%
2018	8%	17%	8%
2017	8%	17%	8%
2016	8%	17%	8%
2015	8%	17%	8%

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# Black Students

291 Students

30,223 Students

% Black Students

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Black Student Percentage Trends
Year	Marin County Average	California (CA) Average	National Average
2025	3%	5%	7%
2024	3%	5%	7%
2023	2%	5%	8%
2022	2%	4%	7%
2021	2%	5%	7%
2020	2%	5%	8%
2019	2%	4%	7%
2018	2%	4%	7%
2017	2%	5%	7%
2016	2%	5%	7%
2015	2%	5%	8%

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# White Students

4,857 Students

235,771 Students

% White Students

58%

37%

View Data

White Student Percentage Trends
Year	Marin County Average	California (CA) Average	National Average
2025	58%	37%	52%
2024	58%	37%	52%
2023	60%	38%	52%
2022	63%	40%	54%
2021	65%	40%	54%
2020	63%	40%	54%
2019	65%	41%	56%
2018	63%	41%	56%
2017	63%	43%	58%
2016	64%	43%	58%
2015	64%	43%	58%

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# Hawaiian Students

20 Students

5,499 Students

% Hawaiian Students

n/a

# Two or more races Students

n/a

% of Two or more races Students

n/a

# Others Students

2,039 Students

188,336 Students

% of Others Students

24%

29%

View Data

Other Races Student Percentage Trends
Year	Marin County Average	California (CA) Average	National Average
2025	24%	29%	26%
2024	25%	29%	26%
2023	24%	28%	25%
2022	23%	28%	25%
2021	20%	27%	25%
2020	22%	27%	24%
2019	19%	26%	24%
2018	21%	26%	23%
2017	21%	24%	22%
2016	20%	24%	22%
2015	21%	23%	21%

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All Ethnic Groups

Extracurriculars and Sports:

Average Number of Extracurriculars

10 extracurriculars

9 extracurriculars

Average Number of Sports

5 sports

7 sports

Frequently Asked Questions

What are the top ranked private schools in Marin County, CA?

The private schools in Marin County, CA include Marin Catholic High School, Terra Marin School, and The Branson School.

How many private schools are located in Marin County?

49 private schools are located in Marin County.

How much do private schools cost in Marin County?

The average tuition cost is $28,461, which is higher than the California private school average tuition cost of $18,350.

How diverse are private schools in Marin County?

Marin County private schools are approximately 26% minority students, which is lower than the California private school average of 52%.

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

22% of all K-12 students in Marin County are educated in private schools (compared to the CA state average of 10%).

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

27% of private schools in Marin County are religiously affiliated (most commonly Catholic and Christian).

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

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Year	Marin County Average	California (CA) Average	National Average
2025	184	180	179
2024	179	175	172
2023	180	181	174
2022	181	189	185
2021	178	185	180
2020	178	179	171
2019	181	179	175
2018	173	173	172
2017	177	179	180
2016	173	173	178
2015	176	162	167

Quick Facts (2026-27)

Quick Facts (2026-27)

Top Ranked Marin County Private Schools (2026-27)

Marin 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

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 (2017-2025)

Students by Ethnicity:

Diversity Score Trends

Percentage of Private School Students of American Indian 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

Filter Schools

Quick Links

Most Popular Articles

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Best Marin County Private Schools (2026-27)

Top Ranked Marin County Private Schools (2026-27)

Marin 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

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 (2017-2025)

Students by Ethnicity:

Diversity Score Trends

Percentage of Private School Students of American Indian 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