The top five boarding schools in the United States according to Business Insider's 2015 rankings are Phillips Exeter Academy in Exeter, New Hampshire; Phillips Academy Andover, in Andover, Massachusetts; Groton School in Groton, Massachusetts; St. Paul's School in Concord, New Hampshire; and Deerfield Academy, in Deerfield, Massachusetts. All are also among Forbes' top-20 prep school rankings of 2010.
Business Insider's rankings consider the school's selectivity in accepting students, SAT scores and endowment size. Forbes' criteria include student/faculty ratio, percent of faculty holding advanced degrees, endowment size and percentage of graduates entering top-10 colleges in the five years preceding the ranking.
Phillips Exeter Academy offers hundreds of courses, study abroad and internship opportunities to the 19 percent of students that it accepts. Each class typically has about 12 students. SAT scores average 2107, and about 29 percent of graduates went on to attend an Ivy League college, Stanford or the Massachusetts Institute of Technology.
Rival Phillips Academy Andover's average SAT score is 2076. The school accepts only 13 percent of applicants, and about a third of its graduates go on to an Ivy, MIT or Stanford.
Groton is an Episcopal school of 370 students and an average class size of 12. Over 90 percent of students score a 3 or better on Advanced Placement exams, and the average SAT score is 2014.
St. Paul's School is also Episcopal. Students may select from more than 50 advanced and AP courses. The campus includes centers for art, the performing arts, astronomy, one for math and science, and one for athletics and fitness. It also has a pool, a boathouse, hockey rinks, climbing walls, and tennis courts.
Students at the Deerfield Academy can take college-level courses in any subject. The average SAT score is 2000.