Round Lake Park is a city located in Illinois. With a 2020 population of 7,829, it is the 261st largest city in Illinois and the 3682nd largest city in the United States . Round Lake Park is currently growing at a rate of 0.53% annually and its population has increased by 4.32% since the most recent census, which recorded a population of 7,505 in 2010. Round Lake Park reached it's highest population of 7,829 in 2021. Spanning over 2 miles, Round Lake Park has a population density of 3,796 people per square mile.
The average household income in Round Lake Park is $61,807 with a poverty rate of 8.95%. The median rental costs in recent years comes to $1,198 per month, and the median house value is $121,900. The median age in Round Lake Park is 42.4 years, 39.1 years for males, and 47.1 years for females.