St. Mark's School

Founded in 1865, St. Mark’s School is a premier coeducational boarding and day school serving students in grades 9–12. Located in Southborough, Massachusetts, just 25 miles west of Boston, our 250-acre campus features picturesque buildings, expansive fields, and faculty homes that create a true sense of community. At St. Mark’s, 374 students are guided by an exceptional faculty through a rigorous academic program complemented by robust offerings in athletics, the arts, leadership, and spiritual life. Our close-knit environment fosters meaningful relationships and supports students as they grow both intellectually and personally. With an average class size of 10 students and a student-to-faculty ratio of 6:1, students benefit from individualized attention and deep engagement in the classroom. Our curriculum includes more than 20 advanced courses, along with distinctive signature programs such as the STEM Fellowship, History Fellowship, Global Diploma, and Classics Diploma. These opportunities encourage students to pursue their interests at a high level while developing critical thinking, creativity, and global awareness. St. Mark’s is committed to cultivating character, leadership, and a strong sense of purpose. Our diverse and motivated student body is inspired by passionate educators who challenge and support them to reach their full potential. Graduates leave St. Mark’s exceptionally well prepared for success at highly selective colleges and universities, and for lives defined by courage, integrity, and impact. We invite you to take a closer look and discover what makes the St. Mark’s experience truly distinctive.