| Business | Phone |
| E Merle Smith Jr High 900 S San Patricio St, Sinton 78387 | (361) 364-6840 |
| Welder Elementary 600 N Bowie St 7838, Sinton 78387 | (361) 364-6600 |
| Sinton Elementary 200 S Bowie St, Sinton 78387 | (361) 364-6860 |
| Special Education Co-Op 322 S Archer St, Sinton 78387 | (361) 364-6838 |
| Lamar Intermediate 800 S San Patricio St, Sinton 78387 | (361) 364-6890 |
| Sinton High School 400 N Pirate Blvd, Sinton 78387 | (361) 364-6652 |
| Sinton Independent Sch Dist 300 W George St, Sinton 78387 | (361) 364-6900 |
| Sinton Independent School Dist 400 N Pirate Blvd, Sinton 78387 | (361) 364-6883 |