Rolla is a city located in Phelps County Missouri. It is also the county seat of Phelps County. With a 2020 population of 20,705, it is the 36th largest city in Missouri and the 1800th largest city in the United States . Rolla is currently growing at a rate of 0.67% annually and its population has increased by 5.86% since the most recent census, which recorded a population of 19,559 in 2010. Spanning over 12 miles, Rolla has a population density of 1,708 people per square mile.
The average household income in Rolla is $53,602 with a poverty rate of 28.84%. The median rental costs in recent years comes to $737 per month, and the median house value is $131,100. The median age in Rolla is 26 years, 23 years for males, and 31.3 years for females.