South Texas ISD
- Education
South Texas ISD
100 Med High Dr.
Mercedes, TX 78570-9702
(956) 514-4255
(956) 565-9129 (fax)
Hours:
District/campus offices are open M-Th 8:00 a.m. to 5:00 p.m. and F from 8:00 a.m. to 4:00 p.m.