I guess I'm the first one to notice this and point it out but, and I know this by heart and don't even need to look as I'm somewhat familiar with the Lone Star State, Tarrant County which you used is where Fort Worth is in North Texas; Austin is in Travis County.
Now, it's entirely possible the population pyramid in Austin is somewhat similar to the population pyramid in Fort Worth, but still, wrong county.
(Travis was the commander at the Alamo, I've always found it easy to remember the capital's county honors him.)