- Brunswick is a college preparatory day school serving boys in grades pre-kindergarten through twelve.
- The school enrolls 894 boys with 81 seniors in the Class of 2008.
- 25% of applicants for 2006-2007 were accepted, mostly for entry years in each division: pre-kindergarten and kindergarten in the Lower School, fifth and sixth grades in the Middle School, and ninth and tenth grades in the Upper School.
- 16% of the student body receives financial aid.
- 15.4% of the student body are minority students.
- There are 163 faculty, including 24 interns/assistant teachers; approximately 84% hold post graduate degrees.
- The student teacher ratio is 5 to 1.
- Brunswick has three campuses with a total of 118 acres.
- Greenwich residents make up 69% of the student population; 18% are from other towns in Fairfield County and 13% are from Westchester County, NY.
- The average class size is 15 students.
- Brunswick Upper School, in coordination with Greenwich Academy, offers 153 courses with advanced placement courses in 25 subjects.
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100% of graduates go to four-year colleges with 89% of the graduating class of 2006 attending colleges ranked as "Most or Highly Competitive" schools.
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There are 15 varsity sports in the Upper School and 18 sub-varsity sports; there are 38 co-curricular clubs and organizations. Community service is required of all students.
- Brunswick's endowment (as of fiscal year end 2007) was $92.1 million.