Commonwealth School
Independent school · Grades 9–12
Boston, MA
151 Commonwealth Ave, Boston, MA 02116
Overall grade: A+
ChooseAPrivateSchool.com grade, from official facts compared with similar schools.
- A+Class size
- ACollege-going
- B+Years serving families
- A+Diversity
What stands out
- Smaller classes than 85% of independent schools in Massachusetts
- 100% of graduates go to four-year colleges
Commonwealth School is an independent private school in Boston, Massachusetts, for students from 9th grade through 12th grade. It has about 154 students and around 4 students per teacher, smaller classes than 85% of independent high schools in Massachusetts. The school reports that about 100% of its graduates go on to four-year colleges. Students attend about 7.5 hours a day, 160 days a year.
At a glance
- Grades
- Grades 9–12
- Students
- 154
- Teachers
- 39.1 (full-time equivalent)
- Students per teacher
- 3.9
- Boys and girls
- Coed · 76 girls, 78 boys
- Religious affiliation
- None (nonsectarian)
- School day
- About 7.5 hours
- School year
- 160 days
- Graduates going to 4-year colleges
- About 100% (the school's estimate for the class before the survey)
- Library
- Yes
Reviews
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How it compares
- Smaller classes than 85% of independent high schools in Massachusetts (4 students per teacher).
- A smaller school: fewer students than 65% of independent high schools in Massachusetts.
- Compared with 26 independent high schools in Massachusetts.
Students by survey year
Total students reported in official records since 2011–12.
Students by grade
Student body
Member of
- National Association of Independent Schools
Questions to ask on a tour
- What is tuition, and what does it include (books, fees, uniforms, trips)?
- Do you offer financial aid, sibling discounts or payment plans?
- Do you accept ESA, voucher or tax-credit scholarship funds?
- How big are classes in my child's grade?
- What support is there for students who need extra help or more challenge?
- Is the school accredited, and by whom?
- What do a typical day and a typical week look like?
- How does the school communicate with families?
Questions about Commonwealth School
What grades does Commonwealth School serve?
Commonwealth School serves grades 9–12.
How many students attend Commonwealth School?
About 154 students, with 4 students per teacher, according to official records.
How much is tuition at Commonwealth School?
Call the school to ask about tuition, financial aid and payment plans.
Official record · Updated October 2026 · Official search · Something wrong? Tell us
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