South Texas Independent School District (STISD) is comprised of six magnet schools throughout the Rio Grande Valley. These are as follows: 

Middle Schools (Grades 7 and 8):
High Schools (Grades 9-12):
  • South Texas ISD Health Professions (Health Professions) in Mercedes
  • South Texas ISD Medical Professions (Medical Professions) in Olmito
  • South Texas ISD Science Academy (Science Academy) in Mercedes
  • South Texas ISD World Scholars (World Scholars) in Edinburg - previously South Texas Business, Education & Technology Academy (BETA)