Fast Facts
| Number of Member Schools | 96 |
| Number of RAC Schools (Recognition of Accreditation Candidacy) | 1 |
| Number of Teachers | 6,181 |
| Number of Students | 58,781 |
| Total Financial Aid Awarded (current school year) | $130 million |
| Day Schools | 93 |
| Boarding Schools | 4 |
| Coed Schools | 86 |
| Single-Sex Schools | 11 |
| Secondary Schools | 59 |
| Elementary Schools | 38 |
| Schools with Preschools | 70 |
| Schools with Secondary Only (grade 5 and up) | 13 |
| Schools located in Major Metropolitan Areas (Albuquerque, Austin, Dallas, El Paso, Fort Worth, Houston, New Orleans, San Antonio, Oklahoma City, Phoenix) | 93% |
| Schools located in smaller communities | 7% |
| Arizona Schools | 3 |
| Kansas Schools | 1 |
| Louisiana Schools | 17 |
| New Mexico Schools | 7 |
| Oklahoma Schools | 5 |
| Texas Schools | 64 |
| Median Experience, ISAS Head of School (in Years) | 7.4 |
| Female Heads of School | 44% |
| Male Heads of School | 56% |
| Heads of Color | 10.4% |