Episcopal High School Photo

Top 20 Best Texas Private High Schools Belonging to Independent Schools Association of the South West (ISAS) (2025)

For the 2025 school year, there are 29 private high schools belonging to Independent Schools Association of the South West (ISAS) serving 19,460 students in Texas. You can also find more schools membership associations in Texas.
The top ranked private high schools belonging to Independent Schools Association of the South West (ISAS) in Texas include Saint Mary's Hall, St. Stephen's Episcopal School, and The John Cooper School.
The average tuition cost is $28,369, which is higher than the Texas private high school average tuition cost of $14,289.
45% of private high schools belonging to Independent Schools Association of the South West (ISAS) in Texas are religiously affiliated (most commonly Episcopal and Catholic).

Top Ranked Private High Schools Belonging to Independent Schools Association of the South West (ISAS) in Texas (2025)

School
Location
Grades
Students
Allen Academy
Allen Academy Photo
(3)
3201 Boonville Rd
Bryan, TX 77802
(979) 776-0731
Grades: PK-12
| 327 students
Austin Waldorf School
Austin Waldorf School Photo - Grade Two Classroom
Special Program Emphasis
8700 South View Road
Austin, TX 78737
(512) 288-5942
Grades: PK-12
| 421 students
Cistercian Preparatory School
Cistercian Preparatory School Photo
All-boys | Special Program Emphasis (Catholic)
3660 Cistercian Road
Irving, TX 75039
(469) 499-5400
Grades: 5-12
| 357 students
Duchesne Academy Of The Sacred Heart
Duchesne Academy Of The Sacred Heart Photo - Duchesne Academy of the Sacred Heart is Houston's only all-girls' Catholic school offering Pre-K3 through 12th-grade education.
All-girls (Catholic)
(5)
10202 Memorial Dr
Houston, TX 77024
(713) 468-8211
Grades: PK-12
| n/a students
The Emery/Weiner School
The Emery/Weiner School Photo - A number of students participate in arts programs at Emery/Weiner. Extracurricular opportunities in the arts include theater, dance, choir, band, and studio art offerings.
(Jewish)
9825 Stella Link Rd
Houston, TX 77025
(832) 204-5900
Grades: 6-12
| 604 students
Episcopal High School
Episcopal High School Photo
(Episcopal)
4650 Bissonnet St
Bellaire, TX 77401
(713) 512-3400
Grades: 9-12
| 797 students
The Episcopal School Of Dallas
The Episcopal School Of Dallas Photo - Lower School students enjoy parks, playgrounds, and nature trails around our 80+ acre campus in the heart of North Dallas.
(Episcopal)
4100 Merrell Rd
Dallas, TX 75229
(214) 358-4368
Grades: NS-12
| n/a students
Fort Worth Country Day
Fort Worth Country Day Photo - Fort Worth Country Day (FWCD) is a JK-12 private, independent, coeducational, nondenominational college-preparatory school located on approximately 100 acres in Fort Worth, Texas. The mission of Fort Worth Country Day School is to foster the intellectual, physical, emotional, and ethical development of capable students through an academically rigorous college preparatory program that integrates the arts and athletics.
(3)
4200 Country Day Lane
Fort Worth, TX 76109
(817) 302-3209
Grades: PK-12
| 1,097 students
Greenhill School
Greenhill School Photo
4141 Spring Valley Road
Addison, TX 75001
(972) 628-5400
Grades: PK-12
| 1,322 students
Headwaters School
Headwaters School Photo - Headwaters Students are Peacemakers, Advocates, Creators, and Thinkers ranging from 18 months to high school seniors.
Montessori School
(2)
807 Rio Grande
Austin, TX 78701
(512) 480-8142
Grades: PK-12
| 525 students
The Hockaday School
The Hockaday School Photo
All-girls
11600 Welch Road
Dallas, TX 75229
(214) 360-6526
Grades: PK-12
| 1,110 students
Houston Christian High School
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.
(Christian)
(1)
2700 W Sam Houston Parkway N
Houston, TX 77043
(713) 580-6000
Grades: 9-12
| 540 students
The John Cooper School
The John Cooper School Photo - The Rock Math & Science Center
(11)
One John Cooper Drive
Spring, TX 77381
(281) 367-0900
Grades: PK-12
| 1,312 students
Keystone School
Keystone School Photo - Keystone School Upper School Students
(6)
119 E Craig Place
San Antonio, TX 78212
(210) 735-4022
Grades: NS-12
| 491 students
Lakehill Preparatory School
Lakehill Preparatory School Photo
(3)
2720 Hillside Drive
Dallas, TX 75214
(214) 826-2931
Grades: K-12
| 390 students
The Oakridge School
The Oakridge School Photo - In the past five years, 100% of Oakridge's graduates have been accepted to four-year colleges.
(10)
5900 West Pioneer Parkway
Arlington, TX 76013
(817) 451-4994
Grades: PK-12
| 682 students
Parish Episcopal School
Parish Episcopal School Photo - The new Gymnasium at Parish Sigma campus.
(Episcopal)
(4)
4101 Sigma Road
Dallas, TX 75244
(972) 239-8011
Grades: PK-12
| 1,124 students
The Post Oak School
The Post Oak School Photo - Middle School (D.C. trip)
Montessori School
(2)
4600 Bissonnet St
Bellaire, TX 77401
(713) 661-6688
Grades: NS-12
| 484 students
St. Francis Episcopal School
St. Francis Episcopal School Photo - St. Francis Episcopal School Piney Point Village Campus
(Episcopal)
335 Piney Point Road
Houston, TX 77024
(713) 458-6159
Grades: PK-12
| 875 students
St. Mark's School Of Texas
St. Mark's School Of Texas Photo - St. Mark's School of Texas campus
All-boys (Episcopal)
(1)
10600 Preston Road
Dallas, TX 75230
(214) 346-8700
Grades: 1-12
| 903 students
Saint Mary's Hall
Saint Mary's Hall Photo - Saint Mary's Hall
9401 Starcrest Dr
San Antonio, TX 78217
(210) 483-9100
Grades: PK-12
| 884 students
St. Stephen's Episcopal School
St. Stephen's Episcopal School Photo - The St. Stephen's Chapel at sunset
(Episcopal)
6500 St. Stephen's Drive
Austin, TX 78746
(512) 327-1213
Grades: 6-12
| 707 students
Shelton School
Montessori School
17301 Preston Road
Dallas, TX 75252
(972) 774-1772
Grades: PK-12
| 1,055 students
TMI Episcopal
TMI Episcopal Photo - Walker Innovation Center
(Episcopal)
20955 West Tejas Trail
San Antonio, TX 78257
(210) 698-7171
Grades: 6-12
| 601 students
Trinity School
Trinity School Photo
(Episcopal)
3500 W Wadley Ave
Midland, TX 79707
(432) 697-3281
Grades: PK-12
| 665 students
7500 Dutch Branch Rd
Fort Worth, TX 76132
(817) 321-0100
Grades: PK-12
| 1,020 students
Ursuline Academy Of Dallas
All-girls | Special Program Emphasis (Catholic)
(3)
4900 Walnut Hill Ln
Dallas, TX 75229
(469) 232-1800
Grades: 9-12
| 860 students
The Winston School
The Winston School Photo
Special Education School
(1)
5707 Royal Lane
Dallas, TX 75229
(214) 691-6950
Grades: K-12
| 152 students
The Winston School San Antonio
The Winston School San Antonio Photo - The Winston School San Antonio"Advocating for minds that learn differently."
Special Program Emphasis
(2)
8565 Ewing Halsell Dr
San Antonio, TX 78229
(210) 615-6544
Grades: 1-12
| 155 students

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