- Deep East Texas
- North East Texas
- South Texas
- Texas Blacklands
- Texas Coastal Bend
- Texas Cross Timbers
- Texas Edwards Aquifer
- Texas Edwards Plateau Western
- Texas Grande Prairie
- Texas High Plains I
- Texas High Plains II
- Texas High Plains III
- Texas High Plains IV
- Texas High Plains V
- Texas Middle Coast
- Texas Rio Grande Valley
- Texas Rolling Plains I
- Texas Rolling Plains II
- Texas Trans-Pecos
- Texas Upper Coast
- Texas Winter Garden
- Texas Edwards Plateau Eastern