As of September 1, 2021 SAIS has 386 member schools from 14 US states, the Caribbean, and Latin America, making SAIS the largest regional independent school association in the country. SAIS represents over 223,000 students.
Of member schools, 52% are secular and 48% are non-secular.
For the non-secular schools, religious affiliations are as follows:
Total enrollment in SAIS member schools is over 223,000 students. The smallest school has 35 students; the largest has 2,635 students. Median enrollment is 471. Average enrollment is 578.
The oldest school was founded in 1728; the newest school was founded in 2016. Median school age is 48 years.
While 94% of SAIS member schools are coeducational, 3% are boys-only and 3% are girls-only.
SAIS member schools are also active in other independent school organizations: