Excellent
#17 of 389 private schools in MA
Top 4% of private schools
St Mark's School
High School
25 MARLBORO RD, Southborough, MA 01772
Estimated academic score. This school does not have standardized test data. Based on MA statewide data. Learn more
Enrollment
375
Student-Teacher
5.7:1
Score
8.2
Grades
9th – 12th
Enrollment
375
Student-Teacher
5.7:1
Score
8.2
Grades
9th – 12th
Updated
2021-22
Updated 2021-22
How this school compares
In Southborough
#1 of 3
public schools
Massachusetts high schools
#5 of 98
About St Mark's School
ST Mark's School is a public high school located in Southborough, Massachusetts. Serving students from ninth through twelfth grade, the school has an enrollment of 375 and maintains a student-teacher ratio of 5.7:1 with 65 full-time equivalent teachers on staff. Nestled in a large suburban area just outside Worcester, ST Mark's School offers a supportive educational environment that focuses on fostering growth and development for each student.
While the school’s current MySchoolScout Rating is 2.4 out of 10, it holds a state ranking of #147 among 389 high schools in Massachusetts, placing it in the 62nd percentile. Despite not having specific test score data or an academic score available to provide more concrete measures of performance, ST Mark's School continues to work diligently on enhancing its educational offerings and supports for students. Located within a suburban community, ST Mark's School benefits from being part of a vibrant area that balances the advantages of nearby urban centers with the close-knit feel of a smaller town.
What Parents Should Know
With a student-teacher ratio of 5.7:1, St Mark's 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, St Mark's 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
- $114,662
- Per-Pupil Revenue
- Total revenue ÷ enrollment
- $107,364
- Financial Health
- Revenue-to-expense ratio (>1.0 = surplus)
- 0.94x — Tight
- Tuition Dependency
- Share of revenue from program services (tuition, fees)
- 63%
- Total Assets
- End-of-year total assets from IRS filing
- $253.2M
Financial data from IRS Form 990 filings via ProPublica Nonprofit Explorer. Per-pupil figures based on current enrollment of 375 students. Not all private schools file Form 990.
Compare to Public Schools
BetaHow St Mark's School compares to the 4 public schools in Southborough, MA
Student Demographics
All Schools in Southborough
| School | Rating |
|---|---|
| St Mark's School (this school) | 8.2 |
| Albert S. Woodward Memorial School | 7.9 |
| P Brent Trottier | 8.2 |
| Margaret A Neary | 7.4 |
| Mary E Finn School | 7.5 |
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 MA.
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 MA
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
25 MARLBORO RD, Southborough, MA 01772
Nearby Alternatives
Families considering St Mark's School may also want to explore other high schools in the area. GLENHAVEN ACADEMY (rated 7.0/10, 2.0 miles away, in nearby Marlborough), a more accessible option. Another option is Advanced Math and Science Academy Charter School (rated 7.0/10, 3.0 miles away, in nearby Marlborough), a more accessible option. Additionally, Marlborough High (rated 6.5/10, 3.8 miles away, in nearby Marlborough), a more accessible option. For more schools in Southborough, see our Southborough schools guide .
Nearby Schools
20 within 4.2 mi| School | Distance | Rating |
|---|---|---|
| FAY SCHOOL Southborough | 0.3 mi | 7.4 |
| Albert S. Woodward Memorial School Southborough | 0.4 mi | 7.9 |
| P Brent Trottier Southborough | 0.9 mi | 8.2 |
| Margaret A Neary Southborough | 1.0 mi | 7.4 |
| GLENHAVEN ACADEMY Marlborough | 2.0 mi | 7.0 |
| THE NEW ENGLAND CENTER FOR CHILDREN Southborough | 1.8 mi | 7.7 |
| Mary E Finn School Southborough | 2.4 mi | 7.5 |
| Francis J Kane Marlborough | 2.4 mi | 7.0 |
| Early Childhood Center Marlborough | 2.9 mi | 5.1 |
| 1 LT Charles W. Whitcomb School Marlborough | 3.5 mi | 4.7 |
| THE COTTAGE CHILDRENS CENTER Marlborough | 3.4 mi | — |
| Advanced Math and Science Academy Charter School Marlborough | 3.0 mi | 7.0 |
| Richer Marlborough | 3.1 mi | 3.4 |
| Marlborough High Marlborough | 3.8 mi | 6.5 |
| Goodnow Brothers Elementary School Marlborough | 3.8 mi | 7.2 |
| Charles Jaworek School Marlborough | 4.0 mi | 4.5 |
| Brophy Framingham | 3.4 mi | 4.2 |
| REED ACADEMY Framingham | 3.5 mi | — |
| Assabet Valley Vocational High School Marlborough | 4.5 mi | 5.7 |
| METROWEST CHRISTIAN ACADEMY Ashland | 4.2 mi | 4.5 |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 01772 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$196,680
Median Home Value
$816,500
Median Rent
$2,425/mo
Population
9,781
College Educated
75.4%
Homeownership
89.4%
Avg Commute
32.8 min
Poverty Rate
4.1%
Median Age
43.3
Community Profile
The community surrounding St Mark's School has a median household income of $196,680. It is a well-educated community where 75% of adults hold a bachelor's degree or higher. The median home value in the area is $816,500, with a median rent of $2,425/month. The local poverty rate of 4.1% is relatively low. The average commute for residents is 33 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 |
|---|---|
| Rockport High Rockport, MA | 8.1 |
| THE NEWMAN SCHOOL Boston, MA | 8.1 |
| Wahconah Regional High Dalton, MA | 8.3 |
| BEAVER COUNTRY DAY SCHOOL Chestnut Hill, MA | 7.9 |
| Bromfield Harvard, MA | 8.5 |
| Hamilton-Wenham Regional High South Hamilton, MA | 8.5 |
Frequently Asked Questions
Common questions about St Mark's School
What grades does St Mark's School serve?
St Mark's School serves students in grades 9th through 12th.
How many students attend St Mark's School?
St Mark's School has an enrollment of approximately 375 students.
What is the student-teacher ratio at St Mark's School?
The student-teacher ratio at St Mark's School is 5.7:1. A lower ratio generally means more individual attention per student. The national average is approximately 11:1 for private schools.
How does St Mark's School rank in MA?
St Mark's School is ranked #17 out of 389 private schools in MA.
What is St Mark's School's MySchoolScout rating?
St Mark's School has a composite rating of 8.2 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 Mark's School a private school?
Yes, St Mark's School 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 Mark's School a religious school?
St Mark's School has a Episcopal religious affiliation.
Explore More Schools
Neighborhood Context
Powered by 
FBI UCR 2024. City-level (Southborough). Data >1 year old.
Quick Facts NCES PSS (SY 2021-22)
- Grades
- 9th – 12th
- Enrollment
- 375
- Gender Split
- 51% M / 49% F
- Student-Teacher Ratio
- 5.7:1
- Teachers (FTE)
- 65
- Type
- private
- Coed Status
- coed
- Affiliation
- Episcopal
- School Day
- 7 hours
- Days Per Year
- 180 days
- Setting
- Large Suburb
- County
- WORCESTER
- Phone
- (508) 786-6104
- 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.
Read our full methodologyRelated reading
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