Depends on who you listen to - Texas is sometimes referred to as south-central as well. It's certainly big enough to be both, and the key part of either description is the word "south".
I've always thought of I-35 as the unofficial east-west boundary, which sort of fits with the old saying that Dallas is where the East ends, and Fort Worth is where the West begins.
15 posted on 02/01/2013 6:58:55 AM PST by Charles Martel
(Endeavor to persevere...)