Charles E. Merrill, Jr., the founder of Commonwealth
Charles E. Merrill, Jr., son of the founder of Merrill Lynch, and brother of the prominent American poet James Merrill, founded the school in 1957, locating it in Boston's Back Bay to "restore good secondary schooling to the city."[2] The school's name is derived directly from the official Commonwealth of Massachusetts and its namesake Commonwealth Avenue that stretches across downtown Boston, which the school resides on. Merrill encouraged Commonwealth students to be "decent, socially responsible, generous people," actively engaged in public affairs.[2] For some decades after his retirement, Merrill returned to the school once a year to give a speech on a topic of his choice, and his books are on display in the school library alongside those of Commonwealth alumni.
Merrill insisted that the school has only one rule: "No rollerskating in the halls,"—an exhortation that students should not "act like a damn fool, but think about your actions and how they affect others."[3] While the school keeps a student handbook, this has prevailed as the school's only official rule since its foundation and embodies the school's core value of student engagement and responsibility.
Merrill retired in 1981, and his memoir of the first 23 years of the school's history and his experience as headmaster, The Walled Garden, was published the following year.[2]
Commonwealth is commonly compared to a liberal arts college or university in its curriculum. It places a strong emphasis on academics, both in the STEM and humanities fields, as well as creative expression and arts. It does not emphasize athletics and sports as much, though doing a sport or other form of physical exercise is required for the fall and winter semesters.[5] Due to the small physical size of the school building, it is unable to host any recreational athletic facilities, instead using the "Cafegymnatorium" in the lower level, next to the kitchen, for all-school gatherings and meetings.[6]
All non-art classes at Commonwealth are either Honors-level or Advanced Placement-level (or an equivalent). Students are required to take the following courses at minimum:
Ninth-graders are required to take a ninth-grade seminar and a City of Boston class during their foundational first year, eventually receiving all final grades at the end of the year as Pass/Fail. Students typically are placed into appropriate levels for mathematics and language courses and follow linear tracks for art, history, and science courses.[7]
Commonwealth describes itself as having a diverse student body. 56% of the student body identifies as a person of color, and the school supports a strong LGBTQ+ population. Students come from all across Massachusetts, representing over 40 different cities and towns.[8] Because of the school's location in downtown Boston, it is very accessible by public transit, so for students who do not drive or live in the vicinity, many bike or take the T. With a short walking distance, Commonwealth is directly serviced by light rail through the Green Line at Copley station (between Arlington and Hynes) or by the Commuter Rail and Orange Line at Back Bay station. Commonwealth does not have a traditional official school campus. Instead, students treat nearby Back Bay as its campus and often visit many local attractions during free periods without classes, lunch, or after school. It is next to many restaurants and shops along Newbury Street and Boylston Street, and is a quick walk away from the Public Garden.[9][10]
The average class contains 12 students, with each grade typically containing upwards of 30 students.[8] Each student is paired with an advisor at the school and meets weekly, and the school offers additional social and emotional support through in-house professional counseling.[11] Students are the primary organizers of clubs and all-school events, and are expected to dedicate considerable time to community service and studying under the advisory of a professional mentor each year. In addition to various affinity groups, some student-run clubs include Chess, Go, Model UN, Debate Team, Dungeons & Dragons, Engineering, Environmental Club, Math Team, and Quiz Bowl. There are no requirements for a student to start their own club.[12]
Rankings
Niche has ranked Commonwealth as the second-best private high school in the state in 2024, as well as the fifth-best private high school in the entire country.[13] A significant portion of the senior class is recognized each year by the National Merit Scholarship Program. As of 2025, the average SAT composite score was 1450.[14]
School events
Assemblies
Commonwealth holds an assembly every Thursday.[15]
Sports and recreation
While the Cafegymnatorium has a singular basketball hoop and its annex has ping-pong tables, it is not large enough for students to exercise or play sports, and instead, the school uses local facilities in downtown Boston, such as the East Boston YMCA or Tennis & Racquet Club for student sports.
Twice a year—once in September and once in May—all students and faculty take a three-day long trip to "Hancock." Originally held at founder Charles Merrill's estate in its namesake Hancock, New Hampshire, Hancock is now held at a retreat location, currently in lakeside campgrounds located in New Hampshire or Rhode Island.[17]
Traditions
Each day includes "Recess," when all students and faculty gather in the school's multi-purpose "Cafegymnatorium" for a snack and to hear announcements.[18]
Another tradition is "passing the clay," where all students take part in passing boxes of clay from the first to the fifth floor. This event happens twice a year.[19]
Publications
There are several student-run publications at Commonwealth. They include:
Yearbook: Each year, the senior class (and a few juniors in training) produces its own yearbook.[20]
Helicon: The literary magazine club, with the school's funding, publishes a literary magazine, which accepts many types of literature and art, including poems, short stories, photographs, drawings, and paintings.[20]
The Commonwealth Chronicle: The school's newspaper, which includes a satirical publication called The Leek.[20]
The school produces CM, a twice-yearly magazine for alumni/ae and parents.[21]
In June 2016, the Boston Globe reported that Commonwealth School sued Commonwealth Academy, a high school in Springfield, Massachusetts, over the use of the name "Commonwealth". It had trademarked "Commonwealth School" in 2012.[23] The Springfield school is now known as Springfield Commonwealth Academy.[24]
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