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At A Glance

St. Mark's School

St. Mark's School is a coeducational private Episcopal boarding traditional school for students in grades 9 through 12.

Institution Type: Private Setting: Suburban


St. Mark's School's Full Profile



St. Mark's School says

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 cooperation over self-interest, and we encourage each person to explore his or her place in the larger world beyond our campus. St. Mark’s is a college-preparatory boarding and day school, grades nine through 12, located upon 250 acres in Southborough, Mass., just 25 miles from the cultural opportunities of Boston. The School’s outstanding faculty — 75 in number — lead 347 students through a challenging curriculum and a full program of co-curricular activities, fostering a close community. St. Mark’s engages and motivates talented students of diverse backgrounds, emphasizing excellence, character, and service to the larger community. Class size averages 10, with a student-faculty ratio of five to one. Most departments offer Advanced Placement courses, as well as independent study opportunities that have ranged in topic from building a submarine to studying ancient Latin through primary sources.





Grades Cost Term
High School $49,130 Annual

Private schools, including parochial and boarding, are funded through tuition and fees. The cost varies from school to school, but most families pay tuition to attend them. Many private schools offer financial aid or discounts, so it's worthwhile to ask about these options.


  (508) 786-6000

Entrance Requirements

  • SSAT and the average admitted student scores in the 84th percentile.



Test Scores

1940 Average score for the SAT Composite

Students and Faculty

Students and Faculty

Enrollment Data

Total Enrollment 349
Enrollment By Grade
Grade Number of Students
9 78
10 101
11 94
12 76

St. Mark's School's relatively even enrollment profile may offer insights into student retention rates, local population changes, real estate costs, and the accessibility of alternative educational options. to find out more about the specific factors influencing St. Mark's School's enrollment numbers.

Student Teacher Ratio 7 : 1
Average Class Size 12
Gender 51% Male / 49% Female
Dress Code Casual
Percent Boarding 80%
Student Diversity
Percentage of Student Body
White 82%
Native Hawaiian or Other Pacific Islander 2%
Multi-racial 4%
Hispanic/Latino 3%
Black or African American 5%
Asian 5%
American Indian or Alaska Native 0%


  • Amnesty International
  • Choir
  • Christian Fellowship Club
  • Classics Club
  • Dance Team
  • Environmental Club/ Environmental Awareness Association
  • French Club
  • Gay Straight Alliance
  • German Club
  • Jazz Band
  • Jewish Culture Club/ Jewish Student Association
  • Muslim Student Association
  • Peer Mentoring and Support
  • Peer Tutoring
  • Robotics
  • Spanish Club

Associations & Memberships

Other school associations

National Association of Independent Schools (NAIS)

National Association of Episcopal Schools (NAES)

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