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
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
Enrollment
185
Student-Teacher
6.6:1
Score
7.5
Grades
Pre-K – 8th
Updated
2021-22
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
BetaHow Marin Horizon School compares to 6 public schools serving similar grades in Mill Valley, CA
Student Demographics
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.
Data Unavailable
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)
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.
Explore More Schools
Neighborhood Context
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
- Phone
- (415) 388-8408
- Data Year
- 2022–2023
Resources & Links
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.
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