[deport]

.....For those of us who live in West TX it starts where the oaks stop.....

An interesting comment. Here is a state map showing counties
and basically where the oaks are.

http://www.texasstandard.org/stories/we-wanna-know-where-does-west-texas-begin/

[Dusty Road]

If a person want’s to be a little more specific it’s around Abilene where it changes to Mesquites.

[Elsie]

I guess the Panhandle IS west of the centroid of the state.

North; too.

[Vigilanteman]

Basically, all you have to do is extend the eastern side of the panhandle all the way south to the Rio Grand. Not perfect, but pretty darn close.