Top Ranked Mill Valley Private Schools (2026-27)

Marin Horizon School

Gr: NS-8 | 318 students

Avg. class size: 16 students

Sports: 5 | Extracurriculars: 13

305 Montford Ave

Mill Valley, CA 94941

(415) 388-8408

(8)

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Mount Tamalpais School

Gr: K-8 | 268 students

Avg. class size: 14 students

Sports: 4 | Extracurriculars: 12

100 Harvard Ave

Mill Valley, CA 94941

(415) 383-9434

(3)

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North Bridge Academy

Gr: 2-8 | 95 students

Avg. class size: 12 students

Extracurriculars: 3

Specialized Curriculum

17 Buena Vista AveMill Valley, CA 94941

Mill Valley, CA 94941

(415) 462-5657

(2)

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Terra Marin School

Gr: K-8 | 117 students

Avg. class size: 11 students

70 Lomita Dr

Mill Valley, CA 94941

(415) 906-2220

(2)

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Guidepost Montessori at Mill Valley

Gr: NS-K | 37 students

Montessori School

270 Miller Ave

Mill Valley, CA 94941

(442) 267-6305

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Kumara School

Gr: K-1 | 55 students

Daycare / Preschool

540 Marin Ave

Mill Valley, CA 94941

(415) 388-5437

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Ross Academy Montessori School

Gr: PK-K | 77 students

Avg. class size: 12 students

Montessori School

7 Thomas Dr

Mill Valley, CA 94941

(415) 383-5777

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[+] Show Closed Private Schools in Mill Valley, California

Mill Valley, California Private Schools (Closed)

Ring Mountain School

Gr: K-8 | 99 students

70 Lomita Dr

Mill Valley, CA 94941

(415) 381-8183

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Mill Valley, CA Private School Trends (10-Year)

Private Schools

967

Students

+8.0% (+72 students) 10-yr

$34,290

Avg. Tuition

+80.5% (+$15,295) 10-yr

Avg. Class Size

-27.8% (-5 students) 10-yr

35%

Students of Color

-20.5% (-9.0 pp) 10-yr

6:1

Student-Teacher Ratio

-25.0% (-2.0) 10-yr

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Enrollment & Diversity

Category

This Town (Mill Valley)

This State (CA)

# Schools

7 Schools

3,910 Schools

View Data

Trends in Total Number of Private Schools
Year	Mill Valley, CA Total Schools
2025	7
2024	7
2023	6
2022	7
2021	8
2020	8
2019	8
2018	9
2017	9
2016	8
2015	7

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# Students

967 Students

659,293 Students

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Trends in the Average Number of Students Per Private School
Year	Mill Valley, CA Avg	California (CA)	National
2025	145	180	179
2024	141	175	172
2023	136	181	174
2022	112	189	185
2021	111	185	180
2020	122	179	171
2019	111	179	175
2018	125	173	172
2017	128	179	180
2016	132	173	178
2015	128	162	167

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% Students of Color

35%

52%

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Percentage of Students of Color Trends (2015-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	35%	51%	34%
2024	32%	51%	34%
2023	41%	50%	33%
2022	42%	48%	33%
2021	38%	48%	32%
2020	55%	48%	32%
2019	25%	48%	31%
2018	23%	47%	31%
2017	33%	50%	32%
2016	34%	49%	32%
2015	44%	49%	32%

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0.77

0.74

View Data

Diversity Score Trends
Year	Mill Valley, CA Avg	California (CA)	National
2025	0.77	0.74	0.65
2024	0.77	0.74	0.65
2023	0.76	0.74	0.65
2022	0.72	0.73	0.64
2021	0.71	0.73	0.64
2020	0.69	0.73	0.64
2019	0.67	0.73	0.63
2018	0.73	0.73	0.63
2017	0.72	0.72	0.61
2016	0.72	0.72	0.61
2015	0.74	0.72	0.61

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Show more data/charts: racial breakdown

# American Indian Students

50 Students

3,575 Students

% American Indian Students

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Percentage of Private School Students of American Indian Trends
Year	Mill Valley, CA Avg	California (CA)	National
2025	7%	1%	1%
2024	7%	1%	1%
2023	9%	1%	1%
2022	10%	1%	2%
2021	8%	1%	1%
2020	7%	1%	1%
2019	6%	2%	1%
2018	6%	1%	2%
2017	5%	1%	1%
2016	5%	1%	1%
2015	7%	2%	1%

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# Asian Students

41 Students

71,780 Students

% Asian Students

11%

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Asian Student Percentage Trends
Year	Mill Valley, CA Avg	California (CA)	National
2025	5%	11%	5%
2024	6%	11%	5%
2023	3%	11%	5%
2022	7%	10%	4%
2021	7%	10%	4%
2020	7%	10%	4%
2019	7%	10%	4%
2018	6%	10%	4%
2017	5%	10%	4%
2016	5%	10%	4%
2015	5%	10%	4%

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# Hispanic Students

216 Students

104,409 Students

% Hispanic Students

28%

16%

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Hispanic Student Percentage Trends
Year	Mill Valley, CA Avg	California (CA)	National
2025	28%	16%	9%
2024	30%	16%	9%
2023	32%	16%	9%
2022	39%	16%	8%
2021	33%	16%	9%
2020	29%	16%	9%
2019	27%	16%	8%
2018	22%	17%	8%
2017	21%	17%	8%
2016	21%	17%	8%
2015	25%	17%	8%

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# Black Students

35 Students

30,223 Students

% Black Students

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Black Student Percentage Trends
Year	Mill Valley, CA Avg	California (CA)	National
2025	5%	5%	7%
2024	5%	5%	7%
2023	4%	5%	8%
2022	5%	4%	7%
2021	5%	5%	7%
2020	4%	5%	8%
2019	4%	4%	7%
2018	3%	4%	7%
2017	3%	5%	7%
2016	3%	5%	7%
2015	3%	5%	8%

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# White Students

227 Students

235,771 Students

% White Students

30%

37%

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White Student Percentage Trends
Year	Mill Valley, CA Avg	California (CA)	National
2025	30%	37%	52%
2024	31%	37%	52%
2023	28%	38%	52%
2022	35%	40%	54%
2021	42%	40%	54%
2020	47%	40%	54%
2019	50%	41%	56%
2018	42%	41%	56%
2017	43%	43%	58%
2016	43%	43%	58%
2015	40%	43%	58%

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# Hawaiian Students

1 Student

5,499 Students

% Hawaiian Students

n/a

# Two or more races Students

n/a

% of Two or more races Students

n/a

# Others Students

188 Students

188,336 Students

% of Others Students

25%

29%

View Data

Other Races Student Percentage Trends
Year	Mill Valley, CA Avg	California (CA)	National
2025	25%	29%	26%
2024	21%	29%	26%
2023	24%	28%	25%
2022	4%	28%	25%
2021	5%	27%	25%
2020	6%	27%	24%
2019	6%	26%	24%
2018	21%	26%	23%
2017	23%	24%	22%
2016	23%	24%	22%
2015	20%	23%	21%

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All Ethnic Groups

Academics

# Teachers

140 Teachers

55,641 Teachers

Average Student-Teacher Ratio

6:1

12:1

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Student-Teacher Ratio Trends (2015-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	6:1	12:1	11:1
2024	6:1	12:1	11:1
2023	7:1	12:1	11:1
2022	6:1	12:1	11:1
2021	6:1	13:1	11:1
2020	7:1	13:1	12:1
2019	7:1	12:1	12:1
2018	7:1	12:1	12:1
2017	7:1	13:1	12:1
2016	7:1	13:1	12:1
2015	8:1	13:1	12:1

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% Average Faculty w/Advanced Degree

53%

59%

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Percentage of Faculty With Advanced Degrees Trends (2015-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	53%	59%	55%
2024	53%	58%	54%
2023	51%	58%	54%
2022	65%	59%	54%
2021	52%	59%	54%
2020	80%	58%	54%
2019	80%	58%	53%
2018	49%	58%	53%
2017	49%	58%	53%
2016	33%	57%	52%
2015	33%	57%	52%

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Average Class Size

13 students

17 students

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Class Size Trends (2015-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	13	17	15
2024	14	17	15
2023	14	17	15
2022	16	17	15
2021	17	17	15
2020	17	17	15
2019	17	17	15
2018	17	17	15
2017	17	17	15
2016	21	17	15
2015	18	17	15

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Tuition & Aid

Average Yearly Tuition Cost

$34,290

$18,350

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Tuition Cost Trends (2015-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	$33,596	$18,076	$15,012
2024	$38,200	$17,195	$13,254
2023	$36,895	$16,660	$12,626
2022	$40,780	$15,979	$12,187
2021	$39,505	$15,298	$11,800
2020	$36,290	$14,748	$11,512
2019	$36,290	$14,369	$11,293
2018	$31,783	$13,813	$11,017
2017	$31,333	$13,422	$10,708
2016	$20,470	$12,852	$10,356
2015	$18,995	$11,932	$9,939

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Average Summer Program Cost

$1,500

$1,062

View Data

Summer Program Cost Trends (2021-2022)
Year	Mill Valley, CA Avg	California (CA)	National
2022	$5,777	$934	$1,102
2021	$5,777	$815	$1,125

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Average % on Financial Aid

43%

29%

View Data

Percent on Financial Aid Trends (2015-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	43%	29%	34%
2024	43%	29%	34%
2023	34%	29%	34%
2022	53%	28%	33%
2021	45%	28%	33%
2020	25%	28%	32%
2019	25%	27%	31%
2018	18%	27%	30%
2017	18%	27%	30%
2016	23%	26%	29%
2015	22%	25%	28%

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Average Financial Aid Grant

$25,000

$9,066

View Data

Financial Aid Grant Trends (2015-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	$25,000	$8,932	$7,073
2024	$25,000	$8,712	$6,930
2023	$25,000	$8,186	$6,469
2022	$25,000	$8,205	$6,289
2021	$9,500	$7,081	$6,055
2018	$12,990	$5,977	$5,456
2017	$12,990	$5,752	$5,319
2016	$12,990	$5,279	$5,105
2015	$12,990	$5,100	$5,030

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Average Endowment Size

$3.4 million

$31.26 million

View Data

Endowment Trends (2017-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	$3 M	$31 M	$39 M
2024	$5 M	$17 M	$39 M
2023	$5 M	$16 M	$39 M
2022	$3 M	$18 M	$40 M
2021	$3 M	$17 M	$40 M
2020	$3 M	$16 M	$40 M
2019	$3 M	$15 M	$40 M
2018	$3 M	$12 M	$43 M
2017	$3 M	$16 M	$45 M

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Admissions & Athletics

Average Acceptance Rate

48%

80%

View Data

Acceptance Rate Trends (2021-2025)
Year	Mill Valley, CA Avg	California (CA)	National
2025	30%	80%	81%
2024	40%	84%	85%
2023	60%	84%	85%
2022	40%	84%	85%
2021	40%	84%	85%

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Average Number of Extracurriculars

9 extracurriculars

Average Number of Sports

5 sports

7 sports

Frequently Asked Questions

What are the top ranked private schools in Mill Valley, CA?

The private schools in Mill Valley, CA include Terra Marin School, Mount Tamalpais School, and Marin Horizon School.

How many private schools are located in Mill Valley?

7 private schools are located in Mill Valley.

How diverse are private schools in Mill Valley?

Mill Valley private schools are approximately 35% minority students, which is lower than the California private school average of 52%.

What percentage of students in Mill Valley go to private school?

20% of all K-12 students in Mill Valley are educated in private schools (compared to the CA state average of 10%).

Which private schools in Mill Valley are often viewed compared to one another?

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Quick Facts (2026-27)

Quick Facts (2026-27)

Top Ranked Mill Valley Private Schools (2026-27)

Mill Valley, California Private Schools (Closed)

Mill Valley, CA Private School Trends (10-Year)

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)

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

Student-Teacher Ratio Trends (2015-2025)

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

Class Size Trends (2015-2025)

Tuition Cost Trends (2015-2025)

Summer Program Cost Trends (2021-2022)

Percent on Financial Aid Trends (2015-2025)

Financial Aid Grant Trends (2015-2025)

Endowment Trends (2017-2025)

Acceptance Rate Trends (2021-2025)

Frequently Asked Questions

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