- Texas Blackland
- Texas Coastal Bend
- Texas Cross Timbers
- Texas Deep East
- Texas Edwards Aquifer
- Texas Edwards Plateau Eastern
- Texas Edwards Plateau Western
- Texas El Paso
- Texas Grande Prairie
- Texas High Plains I
- Texas High Plains II
- Texas High Plains III
- Texas Lower South Central
- Texas Middle Gulf Coast
- Texas Northeast
- Texas Rio Grande Valley
- Texas Rolling Plains I
- Texas Rolling Plains II
- Texas Trans-Pecos
- Texas Upper Gulf Coast
- Texas Winter Garden