The agency’s geographical area includes these counties.
- Austin
- Brazoria
- Chambers
- Colorado
- Fort Bend
- Galveston
- Harris
- Liberty
- Matagorda
- Montgomery
- Walker
- Waller
- Wharton
- Atascosa
- Bandera
- Bexar
- Calhoun
- Cornal
- DeWitt
- Dimmit
- Edwards
- Frio
- Gillespie
- Goliad
- Gonzalez
- Guadalupe
- Jackson
- Karnes
- Kendall
- Kerr
- Kinney
- LaSalle
- Lavaca
- Maverick
- Medina
- Real
- Uvalde
- Val Verde
- Victoria
- Wilson
- Zavala
- Angelina
- Harden
- Houston
- Jasper
- Jefferson
- Jacinto
- Shelby
- Trinity
- Tyler
- Bastrop
- Bell
- Blanco
- Bosque
- Brazos
- Burleson
- Burnet
- Caldwell
- Coryell
- Falls
- Fayette
- Freestone
- Grimes
- Hamilton
- Hayes
- Lampasas
- Lee
- Leon
- Limestone
- Llano
- Madison
- McLennan
- Milam
- Mills
- San Saba
- Robertson
- Travis
- Washington
- Williamson