South Texas ISD School District
School District · Mercedes, Texas
Avg Rating
9.0
out of 10
Schools
7
2 mid, 4 high
Per-Pupil Spending
$17,956
Student-Teacher Ratio
14.9:1
Avg Rating
9.0
out of 10
Schools
7
2 mid, 4 high
Per-Pupil Spending
$17,956
Student-Teacher Ratio
14.9:1
Evaluating South Texas ISD?
A district shares budget, policy, and attendance zones across its schools — use this page to judge South Texas ISD as a whole, then compare how its individual schools differ.
Shortlist starter
Start with these real page-level signals, then use the full table and map below.
South Texas ISD Preparatory Academy
Edinburg · Middle. Compare this profile against district averages, level fit, and attendance-zone reality below.
South Texas ISD Science Academy
Mercedes · High. Compare this profile against district averages, level fit, and attendance-zone reality below.
South Texas ISD Medical Professions
Olmito · High. Compare this profile against district averages, level fit, and attendance-zone reality below.
How this district compares
Texas rank
#16 of 899
districts by avg. composite
Vs. state average
+2.7
above Texas avg
Per-pupil spending
$17,956
+$4,988 vs Texas median
District size
4,531 students
Much larger than Texas median
The short answer
South Texas ISD ranks #16 of 899 Texas districts by overall school rating. South Texas ISD's schools with real test data average 9.0/10 across 6 schools. Its top-rated schools are South Texas ISD Preparatory Academy (9.4/10), South Texas ISD Science Academy (9.3/10), and South Texas ISD Medical Professions (9.1/10). Schools with estimated (proxy) scores are excluded from this ranking.
STAAR proficiency rose +7.6 points from 2022 to 2024. That's the biggest jump among South Texas ISD schools across the two most recent comparable testing years.
Top-Rated Schools in South Texas ISD
Ranked by MySchoolScout composite rating using only schools with real test data (6 of 7). "Value" = points above what student poverty predicts. Estimated (proxy) scores are excluded.
| # | School | Rating |
|---|---|---|
| 1 | South Texas ISD Preparatory Academy | 9.4 / 10 |
| 2 | South Texas ISD Science Academy | 9.3 / 10 |
| 3 | South Texas ISD Medical Professions | 9.1 / 10 |
| 4 | South Texas ISD Rising Scholars Academy | 9.1 / 10 |
| 5 | South Texas ISD Health Professions | 8.7 / 10 |
| 6 | South Texas ISD World Scholars | 8.4 / 10 |
See all 7 schools — including those with estimated data — in the full directory below. How we rate schools.
About South Texas ISD
South Texas ISD is a Mercedes, Texas school district serving 7 schools. The district educates 4,531 students with a student-teacher ratio of 14.9:1. The district invests $17,956 per student annually.
With an average rating of 9.0/10, South Texas ISD is among the strongest-performing districts in the state.
The highest-rated school in the district is South Texas ISD Preparatory Academy, which has a composite score of 9.4/10.
In standardized testing, South Texas ISD students show an average math proficiency of 76.0% and ELA proficiency of 85.3%.
The district includes 2 middle schools , and 4 high schools.
District Map
Schools in South Texas ISD, colored by MySchoolScout rank. Click a pin for details.
District Average Test Scores
Average proficiency across all schools in South Texas ISD with test data.
Schools in South Texas ISD
7 schools Middle Schools 2
High Schools 4
Other Schools 1
District Details
- State
- Texas
- City
- Mercedes
- Total Enrollment
- 4,531
- Teachers (FTE)
- 305
- Child Poverty Rate
- 0.4%
- Data Year
- 2023
Frequently Asked Questions
How many schools are in South Texas ISD?
South Texas ISD has 7 schools in total — 2 middle, and 4 high schools. You can explore each school's ratings and details on this page.
What is the average rating for South Texas ISD?
The average composite rating for South Texas ISD is 9.0/10. This score is calculated from the individual ratings of all schools with academic data in the district.
What is the per-pupil spending in South Texas ISD?
South Texas ISD spends $17,956 per student per year.
What is the student-teacher ratio in South Texas ISD?
The average student-teacher ratio in South Texas ISD is 14.9:1.
What is the top-rated school in South Texas ISD?
South Texas ISD Preparatory Academy is the highest-rated school in South Texas ISD with a composite score of 9.4/10.
What are the test scores in South Texas ISD?
Across schools in South Texas ISD with test data, the average math proficiency is 76.0% and the average ELA (reading/writing) proficiency is 85.3%. These figures represent the percentage of students meeting or exceeding grade-level standards.
How does South Texas ISD compare to other districts in Texas?
South Texas ISD has an average school rating of 9.0/10 across 7 schools. Families can compare this to other districts in Texas by visiting individual district pages. Factors like school size, available programs, and community demographics also play a role in choosing the right fit.
How does MySchoolScout rate schools?
MySchoolScout ratings blend student growth, poverty-adjusted academic performance, and learning environment — plus college readiness for high schools. Weights vary by school level, and equity data is shown for context without being factored into the score. Learn more about our rating system on our methodology page.
District Averages
- Overall Rating
- 9.0/10
- Math Proficiency
- 76.0%
- ELA Proficiency
- 85.3%
Resources
How we rate schools
A clear 1–10 score built from public data — growth, academics, and learning environment. No hidden criteria, no pay-to-play.
See how we rateOther School Districts in TX
Compare South Texas ISD with neighboring districts in the state.
- Houston ISD (274)
- Dallas ISD (240)
- Fort Worth ISD (138)
- Northside ISD (126)
- Idea Public Schools (123)
- Austin ISD (123)
- San Antonio ISD (98)
- Cypress-fairbanks ISD (93)
- Fort Bend ISD (83)
- Aldine ISD (80)
- Garland ISD (78)
- Katy ISD (78)
- Frisco ISD (77)
- Plano ISD (77)
- Arlington ISD (75)
- EL Paso ISD (75)
- North East ISD (75)
- Pasadena ISD (67)
- Conroe ISD (66)
- Lewisville ISD (62)
- Round Rock ISD (60)
- Kipp Texas Public Schools (56)
- Brownsville ISD (56)
- Amarillo ISD (55)
Data from NCES Common Core of Data, Texas Education Agency, and U.S. Census ACS for the 2023–24 school year. Rankings computed by MySchoolScout. See all data sources.
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