The planning region covers 13 counties along the Rio Grande Border. The 13 counties include (links go to short informational narratives):
Upper Border Region
1. Reeves 2. Pecos 3. Terrell
Middle Border Region
4. McMullen 5. Webb 6. Duvall
Lower Border Region
7. Jim Hogg 8. Brooks 9. Starr 10. Kenedy
Lower Rio Grande Region
11. Hidalgo 12. Willacy 13. Cameron