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Very Good

#170 of 1,790 private schools in CA

Top 9% of private schools

St Marks School - Altadena

Elementary School

1050 E ALTADENA DR, Altadena, CA 91001

Private Estimated Score

Estimated academic score. This school does not have standardized test data. Based on 8 schools in Altadena. Learn more

Enrollment

210

Student-Teacher

9.7:1

Score

7.7

Grades

Kindergarten – 6th

Updated 2021-22

How this school compares

In Altadena

#2 of 6

public schools

California elementary schools

#88 of 1,102

Academic performance

7.0 / 10

Strong

About St Marks School - Altadena

St. Marks School - Altadena serves 210 students in kindergarten through sixth grade in this well-established Los Angeles County community. With 22 full-time equivalent teachers, the school maintains an impressive 9.7:1 student-teacher ratio, allowing for more individualized attention and smaller class sizes than many elementary schools.

The school has earned strong recognition for its academic performance, receiving a 9.0 out of 10 rating from MySchoolScout and ranking #607 out of 1,790 elementary schools statewide, placing it in the 66th percentile among California schools. This solid academic standing reflects the school's commitment to providing quality education for its elementary-aged students. St.

Marks School - Altadena draws families from a highly educated community where 52% of residents hold bachelor's degrees or higher. The surrounding neighborhood demonstrates strong economic stability with a median household income of $129,030 and a low poverty rate of 7.1%. Home values in the area reflect the desirability of the location, with a median home value of over $1 million.

The school is situated on East Altadena Drive in Altadena's large suburban setting, offering families the benefits of a close-knit community atmosphere while maintaining proximity to the greater Los Angeles metropolitan area.

What Parents Should Know

With a student-teacher ratio of 9.7:1, St Marks School - Altadena 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, St Marks School - Altadena 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.

Compare to Public Schools

Beta

How St Marks School - Altadena compares to 8 public schools serving similar grades in Altadena, CA

Student-Teacher Ratio
9.7:1
This School
vs
20.1:1
Public Avg
Avg School Size
210
This School
vs
380
Public Avg
Avg School Scout Rating
7.7
This School
vs
7.6
Public Avg

Student Demographics

White 47.6% vs 0%
Asian 23.8% vs 0%
Black 7.1% vs 0%
Hispanic 7.1% vs 0%
St Marks School - Altadena Altadena Public Avg

Nearby Elementary Schools

School Rating
St Marks School - Altadena (this school) 7.7
Altadena Elementary 8.1
Charles W. Eliot Middle 6.4
Aveson School of Leaders 8.6
Pasadena Rosebud Academy 9.1
OCS - South 7.2
Aveson Global Leadership Academy 5.7
Odyssey Charter 7.5
Mary W. Jackson STEAM Multilingual Magnet Elementary 7.8

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)
B+ 7.1 / 10
View breakdown
Student-Teacher Ratio 9.7:1
Instructional Commitment
? Total annual instructional hours based on school day length and days per year. (15% of overall score)
B+ 7.3 / 10
View breakdown
School Day Length 7 hours
Annual Instructional Hours 1,260
Diversity & Inclusion
? Racial and ethnic diversity of the student body using Simpson's diversity index. (20% of overall score)
A 8.7 / 10
View breakdown
Diversity Index 69%
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 210
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 47.6%
Asian 23.8%
Two or More 14.3%
Black 7.1%
Hispanic 7.1%

Source: NCES Private School Survey (PSS)

Location

1050 E ALTADENA DR, Altadena, CA 91001

Nearby Alternatives

Families considering St Marks School - Altadena may also want to explore other elementary schools in the area. Pasadena Rosebud Academy (rated 9.1/10, 1.1 miles away), which scores notably higher. Another option is Aveson School of Leaders (rated 8.6/10, 1.0 miles away), which scores slightly higher. Additionally, STRATFORD SCHOOL- ALTADENA ALLEN (rated 8.2/10, 1.2 miles away), which scores slightly higher. For more schools in Altadena, see our Altadena schools guide .

Nearby Schools

20 within 1.4 mi
School Distance Rating
Sahag-Mesrob Armenian Christian School Altadena 0.0 mi
SAHAG-MESROB ARMENIAN CHRISTIAN SCHOOL Altadena 0.0 mi 7.3
Saint Mark's School Altadena 0.0 mi
Charles W. Eliot Middle Altadena 0.5 mi 6.4
Altadena Elementary Altadena 0.4 mi 8.1
St Elizabeth Parish School Altadena 0.8 mi
ST ELIZABETH SCHOOL Altadena 0.9 mi 6.9
PASADENA WALDORF SCHOOL Altadena 0.9 mi 7.3
OAK KNOLL MONTESSORI SCHOOL Altadena 1.1 mi 6.3
Pasadena Rosebud Academy Altadena 1.1 mi 9.1
Aveson School of Leaders Altadena 1.0 mi 8.6
FAIR OAKS SCHOOL Altadena 1.1 mi
EF Academy Pasadena Pasadena 1.3 mi
STRATFORD SCHOOL- ALTADENA ALLEN Altadena 1.2 mi 8.2
Longfellow (Henry W.) Elementary Pasadena 1.4 mi 7.7
OCS - South Altadena 1.2 mi 7.2
PASADENA CHRISTIAN SCHOOL Pasadena 1.4 mi 7.6
Tabernacle Of David Christian Academy Pasadena 1.6 mi
Harriet Tubman Pasadena 1.4 mi
HARRIET TUBMAN PRESCHOOL & ELEMENTARY Pasadena 1.4 mi

Neighborhood Census ACS (2019-2023)

Census data for ZIP 91001 (ACS 2019-2023 5-Year Estimates) · Data sources

Median Income

$133,840

Median Home Value

$1,085,000

Median Rent

$2,298/mo

Population

36,402

College Educated

52.1%

Homeownership

80.5%

Avg Commute

27.9 min

Poverty Rate

7.2%

Median Age

46.1

Community Profile

The community surrounding St Marks School - Altadena has a median household income of $133,840. It is a well-educated community where 52% of adults hold a bachelor's degree or higher. The median home value in the area is $1,085,000, with a median rent of $2,298/month. The local poverty rate of 7.2% 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
Alta Mesa Elementary Redding, CA 7.7
Arellanes (Don Juan Bautista) Elementary Santa Maria, CA 7.7
Arlington Heights Elementary Los Angeles, CA 7.7
Arturo Sanchez Elementary Norwalk, CA 7.7
BARNHART SCHOOL Arcadia, CA 7.7
Burton Street Elementary Panorama City, CA 7.7

Frequently Asked Questions

Common questions about St Marks School - Altadena

What grades does St Marks School - Altadena serve?

St Marks School - Altadena serves students in grades Kindergarten through 6th.

How many students attend St Marks School - Altadena?

St Marks School - Altadena has an enrollment of approximately 210 students.

What is the student-teacher ratio at St Marks School - Altadena?

The student-teacher ratio at St Marks School - Altadena is 9.7:1. A lower ratio generally means more individual attention per student. The national average is approximately 11:1 for private schools.

How does St Marks School - Altadena rank in CA?

St Marks School - Altadena is ranked #170 out of 1,790 private schools in CA.

What is St Marks School - Altadena's MySchoolScout rating?

St Marks School - Altadena has a composite rating of 7.7 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 St Marks School - Altadena a private school?

Yes, St Marks School - Altadena is a private coeducational school with a Episcopal affiliation. Private schools are not required to participate in state standardized testing, so academic performance data may be limited compared to public schools.

Is St Marks School - Altadena a religious school?

St Marks School - Altadena has a Episcopal religious affiliation.

11 schools nearby View map →

Neighborhood Context

Walk Score
76 Very Walkable
Bike Score
39 Somewhat Bikeable

Powered by Walk Score

FBI UCR. County-level only.

Quick Facts NCES PSS (SY 2021-22)

Grades
Kindergarten – 6th
Enrollment
210
Gender Split
50% M / 50% F
Student-Teacher Ratio
9.7:1
Teachers (FTE)
22
Type
private
Coed Status
coed
Affiliation
Episcopal
School Day
7 hours
Days Per Year
180 days
Setting
Large Suburb
County
LOS ANGELES
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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