Bell County (S of Waco)
Bexar County (San Antonio)
Brazos County
Cameron County
Collin County (N of Dallas)
Dallas County (Dallas)
Denton County (N of Dallas)
El Paso County
Galveston County
Harris County (Houston)
Hidalgo County
Hunt County
Lampasas County
McLennan County (Waco)
Rockwall County
Tarrant County (Fort Worth)
Travis County (Austin)
Williamson County (N of Austin)
Dem strong holds and mostly along I-35.