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- Oakwood Independent School District
- Odem-Edroy Independent School District
- O'Donnell Independent School District
- Oglesby Independent School District
- Olfen Independent School District
- Olney Independent School District
- Olton Independent School District
- Onalaska Independent School District
- Orange Grove Independent School District
- Orangefield Independent School District
- Ore City Independent School District
- Overton Independent School District
Read more about this topic: List Of School Districts In Texas