St. Mark's School (2026 Profile)

5.00 (7 reviews)

Tel: (508) 786-6118

25 Marlboro Road
Southborough, MA 01772

www.stmarksschool.org

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St. Mark's School Photo #1 - St. Mark's School

St. Mark's School Photo #2 - St. Mark's School - Lions Roam Travel

St. Mark's School Photo #4 - Students coordinating on a science class project

St. Mark's School Photo #7 - St. Mark's campus

St. Mark's School educates young people for lives of leadership and service.

Founded in 1865 as an intentionally small residential community, the School challenges its students to develop their particular analytic and creative capabilities by both inspiring their academic and spiritual curiosity and kindling their passion for discovery.

We value collaboration over self-interest, and we encourage all members of our community to explore their place in the larger world beyond our campus.

Quick Facts (2026)

Grades: 9-12
Enrollment: 377 students
Yearly Tuition (Boarding Students): $72,930
Yearly Tuition (Day Students): $58,080
Acceptance rate: 29%
Average class size: 11 students
Application Deadline: Jan. 15
Source: Verified school update

Top Rankings

St. Mark's School ranks among the top 20 boarding schools (out of 307 schools) for:

School Overview

| 2025 School Data

St. Mark's School

Boarding School Avg.

School Focus

College Preparatory

Grades Offered

9-12

School Type

Co-ed

Religious Affiliation

Episcopal

Non-denominational

Year Founded

1865

1909

Campus Size

250 acres

125 acres

School Motto

Age Quod Agis

Student Body

Enrollment

377 students

300 students

% Students of Color

35%

25%

% International Students

24%

20%

% Students Boarding

74%

70%

Offers Post-Grad Year

Academic Profile

Saturday Classes

Yes

Frequency of Saturday Classes

Weekly

Classroom Dress Code

Casual
Classroom and chapel dress codes

Casual

Average Class Size

11 students

* National Avg. »18

Student-Teacher Ratio

5:1

7:1

# of AP / Advanced Courses Offered

ESL Courses Offered

Yes

% Faculty with Advanced Degree

66%

70%

Summer Program Offered

Yes

# of AP / Advanced Courses Offered

Courses

Advanced AB CalculusAdvanced Art History

Advanced BC CalculusAdvanced Biology

Advanced CeramicsAdvanced Chemistry

Advanced Environmental ScienceAdvanced European History

Advanced French Language and CultureAdvanced German Language and Culture

Advanced Latin ReadingsAdvanced Music Theory

Advanced Philosophy and LiteratureAdvanced Physics: Electricity and Magnetism

Advanced Physics: MechanicsAdvanced Physics: Modern Topics in Physics

Advanced PsychologyAdvanced Spanish Language and Cultures

Advanced StatisticsAdvanced Studio Art

Advanced Topics in Computer ScienceAdvanced Topics in French Literature

Advanced Topics in German LiteratureAdvanced Topics in Latin Literature

Advanced Topics in MathematicsAdvanced Topics in Music

Advanced Topics in Spanish LiteratureAdvanced United States Government and Politics

Advanced United States HistoryAdvanced World History

History Research Fellowship: An Advanced Topics Course in HistorySTEM Research Fellowship: An Advanced Topics Course in Science

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Tuition & Financial Aid

Endowment Size

$150 million

$25 million

Yearly Tuition
(Boarding Students)

$72,930

$59,900

Yearly Tuition
(Day Students)

$58,080

$33,500

% Students on Financial Aid

32%

40%

Avg. Financial Aid Grant

$55,805

$25,000

Admissions

Application Deadline

Jan. 15

Accepts Standardized Application (SAO and/or Gateway)

Yes

SSAT Required

Yes

Average Percentile SSAT

93%

Acceptance Rate

29%

58%

Director of Admissions

Anne E. Behnke

Associate Director of Admissions

Elise Morgan

Application URL

Online Application

Sports

# Interscholastic Sports Offered

Sports

Colors

Blue and Gold

School Mascot

Winged Lion

Extracurriculars

Total Extracurricular Organizations

Extracurriculars

Club or Organization:

Academic Peer TutorsAcolytes

Admission PrefectsAdmission Tour Guides

After-School TutoringAlpine Snowboarding

Alumni AmbassadorAmnesty International Club

Animal Rights ClubBand/Jazz Groups

Black Student UnionBMX Biking

BoysBrantwood Camp

Calligraphy ClubChinese Students Association

Christian Students - God SquadClassics Club

Climate Action GroupD.O.P.E. Sports Club

Debate ClubDiners Club

Electronics ClubField Sports

Freestyle SkiingFrench Club

GamingGerman Club

GirlsGreen Team

HonorHouse (Dorm) Prefects

IaidoInternational Club

Investment ClubIT Club

Jewelry DesignKayaking / Sea Kayaking

Literary MagazineMozaic

Medical ClubMiddle Eastern Alliance for Peace

MMAOpinator--student newspaper

Political and Current Events (PACE)Protection of Animals and Wildlife (PAW)

Right RwandaRiver Rafting

Sexual Minorities and Straight Supporters (SMASS)Students for Students

Teach ChoateTeach Music

Tiger Lilies

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Arts and Music Programs:

Actor's GuildChoir

Dance ClubEngineering Club

Freestyle SnowboardingHandball

Jazz Club

Recreational Athletic Programs:

Badminton ClubBook & Pen Group

Dry-land TrainingFishing Club

Music InstructionPep and Marching Band

Theater Dance & Music

College Matriculation

10 Most Popular College Choices (# Enrolled)

Boston College

George Washington University

Colby College

Tufts University

Trinity College

Boston University

Georgetown University

Bucknell University

Middlebury College

MIT

View Matriculation Data

School Notes

Founded in 1865, St. Mark's School educates young people for lives of leadership and service, challenging students to take charge of their education, inspiring their academic and spiritual curiosity, and kindling their passion for discovery.
We have crafted an intentionally small community with the specific goal of encouraging close relationships between faculty and students that gives our students courage to stretch, to dream big, and think beyond themselves.Innovation and tradition are part of our educational DNA.
The "school under one roof" design of our main building, an outstanding academic program that combines traditional classroom techniques with experiential learning, a culture that stresses social justice and global perspective, and an athletic program designed to challenge both college-bound athletes and those seeking fitness alone, all come together to create a robust environment unique to St. Mark`s. Graduates leave St. Mark`s ready to live lives of consequence in the 21st century.
Sample of notable school alumni/alumnae:
- Ben Bradlee - Former editor, The Washington Post
- Tarah Donoghue - Former Deputy Press Secretary to Laura Bush, First Lady of the United States from May 2006 to August 2007; worked for former Vice President Dick Cheney
- Thomas Kean - Former New Jersey governor; former chairman of the 9/11 Commission; former president of Drew University
- Julie Kennedy - Founder and leader of AMERICA SCORES; President of the Mycelium Group
- Suzanne P. King - US Olympic cross country skier, 1994 and 1998 Olympic games
- Robert Lowell - Former sixth Poet Laureate Consultant in Poetry to the Library of Congress; Pulitzer Prize recipient; National Book Award recipient; National Book Critics Circle Award recipient
- Ashley Merriman - Premier Chef at Branzino in Seattle, WA; former contestant on Top Chef Season 6
- Storey Musgrave - Astronaut
- Georgia Chaffee Nassikas - Artist
- Scott Young - Retired American professional ice hockey right winger; First round draft pick, 11th overall in 1986 by Hartford Whalers; played on the U.S. National Team; played on three Winter Olympic teams 1988, 1992, and 2002; won 2 Stanley Cups in 1991 and 1996

Source: Verified school update

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Frequently Asked Questions

How much does St. Mark's School cost?

St. Mark's School's tuition is approximately $72,930 for boarding students and $58,080 for day students.

What schools are St. Mark's School often compared to?

St. Mark's School is often viewed alongside schools like Deerfield Academy, Middlesex School, Phillips Academy Andover by visitors of our site.

What is the acceptance rate of St. Mark's School?

The acceptance rate of St. Mark's School is 29%, which is lower than the boarding school average of 58%.

Who are famous alumni from St. Mark's School?

St. Mark's School famous alumni include: Ben Bradlee, Tarah Donoghue, Thomas Kean, Julie Kennedy, Suzanne P. King, Robert Lowell, Ashley Merriman, Storey Musgrave, Georgia Chaffee Nassikas and Scott Young.

What sports does St. Mark's School offer?

St. Mark's School offers 14 interscholastic sports: Baseball, Basketball, Crew, Cross Country, Field Hockey, Football, Golf, Ice Hockey, Lacrosse, Soccer, Softball, Squash, Tennis and Wrestling.

What is St. Mark's School's ranking?

St. Mark's School ranks among the top 20 boarding schools for Highest endowment/student, Most extracurriculars offered, High # of AP/advanced courses offered and High SSAT scores.

When is the application deadline for St. Mark's School?

The application deadline for St. Mark's School is Jan. 15.

Alumni Reviews Review School

Review

Description

St. Mark's School Alumni #1
Class of 2011
5.002/27/2019
Phillips Andover (Post Graduate)

The school's layout makes for quite a unique and homey atmosphere. All classes are located in the main building, and the building itself is centered around Forbes, the student center. The main building also houses. . .

St. Mark's School Alumni #2
Class of 2004
5.004/9/2012
The George Washington University

Several things set St. Mark's apart from other schools, the main factor being the close proximity of students and faculty members. Nicknamed "the school under one roof," St. Mark's houses the entire academic day. . .

St. Mark's School Alumni #3
Class of 2010
5.003/19/2012
Bates College

St. Mark's is extremely community based, and I believe it has made both students and faculty proud to be a member of this school. Because a majority of the school functions within one or two. . .

Show more reviews (4 reviews)

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