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Best Texas Private Schools Belonging to Independent Schools Association of the South West (ISAS) (2025)

For the 2025 school year, there are 48 private schools belonging to Independent Schools Association of the South West (ISAS) serving 26,556 students in Texas. You can also find more schools membership associations in Texas.

The private schools belonging to Independent Schools Association of the South West (ISAS) in Texas include Saint Mary's Hall, The John Cooper School, and Keystone School.

The average tuition cost is $26,580, which is higher than the Texas private school average tuition cost of $14,000.

54% of private schools belonging to Independent Schools Association of the South West (ISAS) in Texas are religiously affiliated (most commonly Episcopal and Catholic).

St. Francis Episcopal School Photo - St. Francis Episcopal School Piney Point Village Campus

St. Mark's School Of Texas Photo - St. Mark's School of Texas campus

The Winston School San Antonio Photo - The Winston School San Antonio"Advocating for minds that learn differently."

Jack Segal Academy (formerly BYDS) Photo - Segal Students playing on the new Rhona & Bruce Caress Playground and Sports Center

Trinity Valley School Photo - TVS: Celebrating 60 years of timeless education

Presbyterian School Photo - Middle School students participate in the School's BYOiPad program. Each student has his/her own iPad to complete class work and assignments. Other digital resources for learning include laptops, Smart Boards, and Apple TV.

TMI Episcopal Photo - Walker Innovation Center

San Antonio Academy Of Texas Photo - Established in 1886, San Antonio Academy provides an exceptional education intentionally crafted for boys, Pre-Kindergarten through 8th grade.

St. Gabriel's Catholic School Photo - St. Gabriel's Catholic School students engage in robotics as early as Pre-K 4 and can participate in competitive robotics beginning in 7th grade.

Houston Christian High School Photo - The "Passport to Lead" program's vision is to inspire young people to lead by uniting faith, intellect and gifts to reach their greatest promise. We teach our students to take the lead to influence people to achieve a common goal and, through this process, honor God. In addition, leadership topics are integrated in the curriculum of every course taught at HC.

The Post Oak School Photo - Middle School (D.C. trip)

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