Level IV Ecoregions in the Cross Timbers
- 27i – Broken Red Plains
- 29b – Eastern Cross Timbers
- 29c – Western Cross Timbers
- 29d – Grand Prairie
- 29e – Limestone Cut Plains
- 29f – Carbonate Cross Timbers
- 30a – Edwards Plateau
- 30b – Llano Uplift
- 32a – Northern Blackland Prairie
- 32c – Flood Plains and Low Terraces