This is a post from last that is still very relevant today.
If you drive south from Dallas, or west from Houston, a subtle shift takes place. The monotonous, flat prairie that dominates much of Texas gives way to a landscape that rises and ebbs.
The region around Highway 35 is called the Hill Country, and although it does not seem so curvy to a Californian, it is some of the very nicest land in the state of Texas, attracting a growing coterie of wealthy boomers seeking rural retreats. It also turns out to be a growth corridor that is expanding more rapidly than any other in the nation. The area is home to three of the 10 counties with more than 100,000 residents that have logged the fastest population growth in the country since 2010.
In fact, there is no regional economy that has more momentum than the one that straddles the 74 miles between San Antonio and Austin. Between these two fast-growing urban centers lie a series of rapidly expanding counties and several smaller cities, notably San Marcos, that are attracting residents and creating jobs at remarkable rates… Read more from Forbes.com