Round Rock is a city located in Williamson County Texas. With a 2020 population of 142,418, it is the 25th largest city in Texas and the 190th largest city in the United States . Round Rock is currently growing at a rate of 3.28% annually and its population has increased by 42.58% since the most recent census, which recorded a population of 99,887 in 2010. Round Rock reached it's highest population of 142,418 in 2021. Spanning over 37 miles, Round Rock has a population density of 3,933 people per square mile.
The average household income in Round Rock is $101,648 with a poverty rate of 6.96%. The median rental costs in recent years comes to $1,316 per month, and the median house value is $244,300. The median age in Round Rock is 34.3 years, 32.8 years for males, and 35.7 years for females.