Ah, but there is. I highly recommend S.M. Stirling's Emberverse series: https://en.wikipedia.org/wiki/Emberverse_series
Well worth the read. One Second After: https://en.wikipedia.org/wiki/One_Second_After is another great choice.
If a nuclear war destroys a large portion of highways and communication equipment, you probably end up with Houston being ruled by one group, Dallas by another and San Antonio forming a government with Austin.
Here's the 1990 FEMA assessment of nuclear targets in Texas: https://www.webpal.org/SAFE/state/TX/tx_nuclear.htm
Assuming that's accurate, my guess is that Odessa/Midland and Laredo would be Texas's major population centers.
I don't think all of them (e.g. The Hunger Games) are what you're after, but some of them surely are.
[1] https://www.goodreads.com/list/show/1840.Best_Post_Apocalypt...