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Very Good

#236 of 1,790 private schools in CA

Top 13% of private schools

Marin Horizon School

Elementary School

305 MONTFORD AVE, Mill Valley, CA 94941

Private Estimated Score

Estimated academic score. This school does not have standardized test data. Based on CA statewide data. Learn more

Enrollment

185

Student-Teacher

6.6:1

Score

7.5

Grades

Pre-K – 8th

Updated 2021-22

How this school compares

In Mill Valley

#2 of 4

public schools

California elementary schools

#126 of 1,102

About Marin Horizon School

Marin Horizon School serves 185 students from prekindergarten through eighth grade in Mill Valley's affluent residential community. This regular public elementary school maintains an exceptionally low student-teacher ratio of 6.6:1 with 28 full-time equivalent teachers, allowing for individualized attention and small class environments. The school has earned strong recognition with a 9.0 out of 10 MySchoolScout rating and ranks #244 out of 1,790 California schools, placing it in the 86th percentile statewide.

This performance reflects the school's commitment to providing quality education in a supportive learning environment. Marin Horizon draws families from a highly educated community where 78% of residents hold bachelor's degrees or higher. The surrounding neighborhood in ZIP code 94941 has a median household income of $206,580 and median home values of $1.8 million, with only 5.5% of residents living below the poverty line.

This socioeconomic stability creates a resource-rich environment that supports student learning and family engagement. The school's small size fosters a close-knit community atmosphere where teachers can develop meaningful relationships with students and families. Located in Mill Valley's large suburban setting, Marin Horizon School operates within one of Marin County's most desirable communities, surrounded by the natural beauty and educational advantages of the North Bay area.

What Parents Should Know

With an enrollment of 185 students, Marin Horizon School is a smaller school where families often find a close-knit community atmosphere. Smaller settings can mean more individual attention from teachers and staff, though they may offer fewer extracurricular options than larger schools.

With a student-teacher ratio of 6.6:1, Marin Horizon School offers a notably low ratio compared to the national average. This typically means smaller class sizes and more opportunities for one-on-one interaction between students and teachers.

As a private school, Marin Horizon School operates independently from the local public school district. Families considering this school should inquire about tuition costs, financial aid availability, and the admissions process. Private schools are not required to follow the same curriculum standards as public schools, which can be either an advantage or a consideration depending on your priorities.

Financial Overview

Source: IRS Form 990 (2023 filing)

Per-Pupil Spending
Total expenses ÷ enrollment
$69,458
Per-Pupil Revenue
Total revenue ÷ enrollment
$73,939
Financial Health
Revenue-to-expense ratio (>1.0 = surplus)
1.06x — Stable
Tuition Dependency
Share of revenue from program services (tuition, fees)
77%
Total Assets
End-of-year total assets from IRS filing
$42.9M

Financial data from IRS Form 990 filings via ProPublica Nonprofit Explorer. Per-pupil figures based on current enrollment of 185 students. Not all private schools file Form 990.

Compare to Public Schools

Beta

How Marin Horizon School compares to 6 public schools serving similar grades in Mill Valley, CA

Student-Teacher Ratio
6.6:1
This School
vs
19.7:1
Public Avg
Avg School Size
185
This School
vs
380
Public Avg
Avg School Scout Rating
7.5
This School
vs
8.3
Public Avg

Student Demographics

White 60% vs 0%
Hispanic 8.1% vs 0%
Black 4.9% vs 0%
Asian 3.2% vs 0%
Marin Horizon School Mill Valley Public Avg

Nearby Elementary Schools

School Rating
Marin Horizon School (this school) 7.5
Park Elementary 9.0
Mill Valley Middle 8.6
Old Mill Elementary 7.8
Edna Maguire Elementary 6.4
Tamalpais Valley Elementary 9.3
Strawberry Point Elementary 8.9

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

Score Breakdown

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 CA.

Classroom Attention
? Student-teacher ratio calibrated against other private schools. Lower ratios mean more individual attention. (30% of overall score)
A 8.7 / 10
View breakdown
Student-Teacher Ratio 6.6:1
Instructional Commitment
? Total annual instructional hours based on school day length and days per year. (15% of overall score)
B 5.6 / 10
View breakdown
School Day Length 7 hours
Annual Instructional Hours 1,204
Diversity & Inclusion
? Racial and ethnic diversity of the student body using Simpson's diversity index. (20% of overall score)
B+ 6.6 / 10
View breakdown
Diversity Index 57%
Community Context

Data Unavailable

School Profile
? Enrollment size and grade span breadth — indicators of program depth and peer community. (15% of overall score)
A- 8.1 / 10
View breakdown
Enrollment 185
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 CA

Test Scores

Test score data not yet available for this school.

Student Demographics NCES PSS (SY 2021-22)

White 60.0%
Two or More 22.2%
Hispanic 8.1%
Black 4.9%
Asian 3.2%
Native American 1.6%

Source: NCES Private School Survey (PSS)

Location

305 MONTFORD AVE, Mill Valley, CA 94941

Nearby Alternatives

Families considering Marin Horizon School may also want to explore other elementary schools in the area. Tamalpais Valley Elementary (rated 9.3/10, 1.8 miles away), which scores notably higher. Another option is Park Elementary (rated 9.0/10, 0.6 miles away), which scores notably higher. Additionally, Dr. Martin Luther King Jr. Academy (rated 8.9/10, 2.3 miles away, in nearby Sausalito), which scores notably higher. For more schools in Mill Valley, see our Mill Valley schools guide .

Nearby Schools

20 within 2.7 mi
School Distance Rating
Marin Horizon School Mill Valley 0.0 mi
Park Elementary Mill Valley 0.6 mi 9.0
North Bridge Academy Mill Valley 0.7 mi
NORTH BRIDGE ACADEMY Mill Valley 0.7 mi 6.0
MOUNT TAMALPAIS SCHOOL Mill Valley 0.8 mi 6.9
Mount Tamalpais School Mill Valley 0.8 mi
Old Mill Elementary Mill Valley 0.8 mi 7.8
Terra Marin School Mill Valley 1.0 mi
Mill Valley Middle Mill Valley 0.8 mi 8.6
Tamalpais High Mill Valley 0.9 mi 8.8
THE HELIX SCHOOL Mill Valley 1.1 mi
Edna Maguire Elementary Mill Valley 1.3 mi 6.4
TERRA MARIN SCHOOL Mill Valley 1.4 mi 7.9
Tamalpais Valley Elementary Mill Valley 1.8 mi 9.3
MARIN PRIMARY & MIDDLE SCHOOL Larkspur 2.3 mi 7.2
OAc San Francisco Larkspur 2.4 mi
Chronos Academy Lakspur 2.4 mi
Neil Cummins Elementary Corte Madera 2.5 mi 5.9
Dr. Martin Luther King Jr. Academy Sausalito 2.3 mi 8.9
ST PATRICK SCHOOL Larkspur 2.7 mi 7.2

Neighborhood Census ACS (2019-2023)

Census data for ZIP 94941 (ACS 2019-2023 5-Year Estimates) · Data sources

Median Income

$210,217

Median Home Value

$1,990,100

Median Rent

$2,949/mo

Population

32,349

College Educated

76.9%

Homeownership

66.6%

Avg Commute

27.5 min

Poverty Rate

5.4%

Median Age

45.6

Community Profile

The community surrounding Marin Horizon School has a median household income of $210,217. It is a well-educated community where 77% of adults hold a bachelor's degree or higher. The median home value in the area is $1,990,100, with a median rent of $2,949/month. The local poverty rate of 5.4% is relatively low. The average commute for residents is 28 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.

Similar Schools

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

School Rating
BEECHWOOD SCHOOL Menlo Park, CA 7.5
Baypoint Preparatory Academy - San Diego San Marcos, CA 7.5
Elk Hills Elementary Tupman, CA 7.5
Hoover Elementary Burlingame, CA 7.5
LA SCUOLA INTERNATIONAL SCHOOL San Francisco, CA 7.5
LOS ENCINOS SCHOOL Encino, CA 7.5

Frequently Asked Questions

Common questions about Marin Horizon School

What grades does Marin Horizon School serve?

Marin Horizon School serves students in grades Pre-K through 8th.

How many students attend Marin Horizon School?

Marin Horizon School has an enrollment of approximately 185 students.

What is the student-teacher ratio at Marin Horizon School?

The student-teacher ratio at Marin Horizon School is 6.6:1. A lower ratio generally means more individual attention per student. The national average is approximately 11:1 for private schools.

How does Marin Horizon School rank in CA?

Marin Horizon School is ranked #236 out of 1,790 private schools in CA.

What is Marin Horizon School's MySchoolScout rating?

Marin Horizon School has a composite rating of 7.5 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.

Is Marin Horizon School a private school?

Yes, Marin Horizon School is a private coeducational school with a Nonsectarian affiliation. Private schools are not required to participate in state standardized testing, so academic performance data may be limited compared to public schools.

Is Marin Horizon School a religious school?

No, Marin Horizon School is a nonsectarian (non-religious) private school.

11 schools nearby View map →

Neighborhood Context

Walk Score
66 Somewhat Walkable
Bike Score
42 Somewhat Bikeable
City Safety
Elevated (1,120/100K)

Powered by Walk Score

FBI UCR 2024. City-level (Mill Valley). Data >1 year old.

Quick Facts NCES PSS (SY 2021-22)

Grades
Pre-K – 8th
Enrollment
185
Gender Split
54% M / 46% F
Student-Teacher Ratio
6.6:1
Teachers (FTE)
28
Type
private
Coed Status
coed
Affiliation
Nonsectarian
School Day
7 hours
Days Per Year
172 days
Setting
Large Suburb
County
MARIN
Data Year
2022–2023

How We Rate Schools

Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.

Read our full methodology

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