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The John Cooper School Photo - The Rock Math & Science Center
The John Cooper School

Best Texas Private High Schools Belonging to Independent Schools Association of the South West (ISAS) (2025-26)

For the 2025-26 school year, there are 30 private high schools belonging to Independent Schools Association of the South West (ISAS) serving 21,457 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 $29,536, which is higher than the Texas private high school average tuition cost of $14,472.
47% 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 (2025-26)

School
Location
Quick Facts
Allen Academy
Allen Academy Photo
(3)
3201 Boonville Rd
Bryan, TX 77802
(979) 776-0731
Gr: PK-12 | 327 students Avg. class size: 12 students Sports: 11 | Extracurrculars: 13 Tuition & acceptance rate listed
Austin Waldorf School
Austin Waldorf School Photo - Grade Two Classroom
Special Program Emphasis
8700 South View Road
Austin, TX 78737
(512) 288-5942
Gr: PK-12 | 421 students Avg. class size: 28 students Sports: 8 | Extracurrculars: 3 Tuition listed
Cistercian Preparatory School
Cistercian Preparatory School Photo
All-boys | Special Program Emphasis (Catholic)
3660 Cistercian Road
Irving, TX 75039
(469) 499-5400
Gr: 5-12 | 357 students Avg. class size: 22 students Sports: 9 | Extracurrculars: 7 Tuition listed
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
Gr: PK-12 | 813 students Sports: 13 | Extracurrculars: 8 Tuition & acceptance rate listed
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)
(1)
9825 Stella Link Rd
Houston, TX 77025
(832) 204-5900
Gr: 6-12 | 604 students Avg. class size: 15 students Sports: 15 | Extracurrculars: 13 Tuition listed
Episcopal High School
Episcopal High School Photo
(Episcopal)
4650 Bissonnet St
Bellaire, TX 77401
(713) 512-3400
Gr: 9-12 | 846 students Avg. class size: 14 students Sports: 16 | Extracurrculars: 29 Tuition listed
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
Gr: NS-12 Avg. class size: 16 students Sports: 21 | Extracurrculars: 52 Tuition listed
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
Gr: K-12 | 1,097 student Avg. class size: 16 students Sports: 16 | Extracurrculars: 26 Tuition listed
Greenhill School
Greenhill School Photo
4141 Spring Valley Road
Addison, TX 75001
(972) 628-5400
Gr: PK-12 | 1,322 student Avg. class size: 18 students Sports: 15 Tuition & acceptance rate listed
Headwaters School
Headwaters School Photo - Headwaters Students are Peacemakers, Advocates, Creators, and Thinkers ranging from 18 months to high school seniors.
Montessori School
(3)
807 Rio Grande
Austin, TX 78701
(512) 480-8142
Gr: PK-12 | 525 students Avg. class size: 20 students Sports: 4 | Extracurrculars: 10 Tuition listed
The Hockaday School
The Hockaday School Photo
All-girls
11600 Welch Road
Dallas, TX 75229
(214) 360-6526
Gr: PK-12 | 1,110 student Avg. class size: 16 students Sports: 17 Tuition & acceptance rate listed
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
Gr: 9-12 | 540 students Avg. class size: 17 students Sports: 17 | Extracurrculars: 12 Tuition & acceptance rate listed
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
Gr: PK-12 | 1,312 student Avg. class size: 18 students Sports: 14 | Extracurrculars: 21 Tuition & acceptance rate listed
Keystone School
Keystone School Photo - Keystone School Upper School Students
(6)
119 E Craig Place
San Antonio, TX 78212
(210) 735-4022
Gr: NS-12 | 491 students Avg. class size: 16 students Sports: 5 | Extracurrculars: 21 Tuition listed
Lakehill Preparatory School
Lakehill Preparatory School Photo
(3)
2720 Hillside Drive
Dallas, TX 75214
(214) 826-2931
Gr: K-12 | 390 students Avg. class size: 14 students Sports: 12 | Extracurrculars: 29 Tuition listed
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
Gr: PK-12 | 682 students Avg. class size: 15 students Sports: 15 | Extracurrculars: 47 Tuition & acceptance rate listed
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
Gr: PK-12 | 1,124 student Avg. class size: 16 students Sports: 16 Tuition & acceptance rate listed
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
Gr: NS-12 | 484 students Avg. class size: 28 students Sports: 7 | Extracurrculars: 16 Tuition & acceptance rate listed
St. Andrew's Episcopal School (Southwest Parkway Campus)
St. Andrew's Episcopal School (Southwest Parkway Campus) Photo
(Episcopal)
5901 Southwest Pkwy
Austin, TX 78735
(512) 299-9700
Gr: 9-12 | 985 students Avg. class size: 16 students Sports: 17 | Extracurrculars: 54 Tuition listed
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
Gr: PK-12 | 875 students Avg. class size: 15 students Sports: 15 Tuition & acceptance rate listed
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
Gr: 1-12 | 924 students Avg. class size: 15 students Sports: 16 Tuition & acceptance rate listed
Saint Mary's Hall
Saint Mary's Hall Photo - Saint Mary's Hall
9401 Starcrest Dr
San Antonio, TX 78217
(210) 483-9100
Gr: PK-12 | 884 students Avg. class size: 15 students Sports: 21 | Extracurrculars: 23 Tuition listed
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
Gr: 6-12 | 707 students Avg. class size: 17 students Sports: 24 | Extracurrculars: 25 Tuition & acceptance rate listed
Shelton School
Montessori School
17301 Preston Road
Dallas, TX 75252
(972) 774-1772
Gr: PK-12 | 1,055 student Avg. class size: 10 students Tuition listed
TMI Episcopal
TMI Episcopal Photo - Walker Innovation Center
(Episcopal)
20955 West Tejas Trail
San Antonio, TX 78257
(210) 698-7171
Gr: 6-12 | 630 students Avg. class size: 15 students Sports: 16 | Extracurrculars: 16 Tuition & acceptance rate listed
Trinity School
Trinity School Photo
(Episcopal)
3500 W Wadley Ave
Midland, TX 79707
(432) 697-3281
Gr: PK-12 | 765 students Avg. class size: 16 students Sports: 9 | Extracurrculars: 7 Tuition & acceptance rate listed
Trinity Valley School
Trinity Valley School Photo - TVS: Celebrating 60 years of timeless education
7500 Dutch Branch Rd
Fort Worth, TX 76132
(817) 321-0100
Gr: PK-12 | 1,020 student Avg. class size: 20 students Sports: 17 | Extracurrculars: 15 Tuition listed
Ursuline Academy Of Dallas
All-girls | Special Program Emphasis (Catholic)
(3)
4900 Walnut Hill Ln
Dallas, TX 75229
(469) 232-1800
Gr: 9-12 | 860 students Avg. class size: 15 students Sports: 15 | Extracurrculars: 8 Tuition listed
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
Gr: 1-12 | 155 students Avg. class size: 8 students Sports: 10 | Extracurrculars: 13 Tuition listed
The Winston School
The Winston School Photo
Special Education School
(1)
5707 Royal Lane
Dallas, TX 75229
(214) 691-6950
Gr: K-12 | 152 students Avg. class size: 8 students Sports: 9 | Extracurrculars: 7 Tuition & acceptance rate listed

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