Round Rock has seen a significant growth in the past years. Round Rock population has grown by 177% since 1990. The population is projected to grow 39% in 10 years from 2006 to 2016 to 118,949.

The Austin-Round Rock MSA has grown 90% to more than 1.4 million since 1990. Williamson County alone soared 154% to 353,830 persons, making it one of the fastest growing urban counties in Texas. The City of Round Rock has grown 7% annually since 1990, thus making Round Rock one of the fastest growing cities in Texas.