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St. Mark's School tuition & admissions

Southborough, MAGrades 9–12Boarding, coedReligious affiliationstmarksschool.org

Tuition 2026-27

$66,700

Boarding $82,300

Application deadline

January 15

2027

Students

377

4 students per teacher

Admission test

ISEE or SSAT

Tuition 2026-27
GradesDayBoarding
9-12$66,700$82,300

Financial aid: $6,788,207 to 110 students (about $61,711 each) in 2024, per the school's IRS Form 990.

How to apply
Entry grades—
Admission testISEE or SSAT
InterviewRequired
Apply throughGateway to Prep Schools or Standard Application Online (SAO)
Application fee—
DeadlineJanuary 15, 2027
Decisions released—
College results, class of 2027
Seniors82
Go to a 4-year college91%
SAT (middle 50%)—
ACT (middle 50%)—
AP coursesNone (own advanced courses)
AP exams scored 3+—
National Merit semifinalists—
School facts
Students377
Teachers (full-time equivalent)91
Students per teacher4.1
School days per year188
Endowment$169,891,566 (FY2025)
Annual revenue$37,003,497 (2024)
Head of school pay$261,605
Where graduates went to college (2024-2026)

3 or more

Babson College, Bates College, Bentley University, Boston College, Boston University, Bowdoin College, Brandeis University, Brown University, Carnegie Mellon University, Colby College, Colgate University, College of the Holy Cross, Columbia University, Connecticut College, Cornell University, Denison University, Duke University, Fairfield University, George Washington University, Georgetown University, Georgia Tech, Hobart and William Smith Colleges, Johns Hopkins University, Middlebury College, New York University, Northeastern University, Northwestern University, Providence College, Rice University, Syracuse University, Trinity College, Tufts University, University of California (Berkeley), University of Chicago, University of Michigan, University of Pennsylvania, University of St Andrews, University of Wisconsin, Villanova University, Wake Forest University, William & Mary, Yale University

From the school's college counseling profile.

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    St. Mark's School FAQ
    How much is St. Mark's School tuition?
    For 2026-27, tuition at St. Mark's School is $66,700 (day) or $82,300 (boarding) for grades 9-12, per the school's website.
    Does St. Mark's School require the ISEE or SSAT?
    St. Mark's School requires the ISEE or SSAT for applicants.
    When is the St. Mark's School application deadline?
    The main application deadline is January 15, 2027. Families apply through Gateway to Prep Schools or Standard Application Online (SAO).
    Does St. Mark's School offer financial aid?
    Yes. St. Mark's School reported $6,788,207 in financial aid to 110 students on its 2024 IRS Form 990.
    How many students attend St. Mark's School?
    St. Mark's School enrolls 377 students in grades 9–12, with about 4 students per teacher (NCES Private School Survey, 2023-24).

    More private schools in MA

    Sources: tuition and admissions from stmarksschool.org (checked Oct 2026); enrollment from the NCES Private School Survey 2023-24; finances from the 2024 IRS Form 990. “—” means we couldn't find it.

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