Libertyville is a city located in Lake County, Illinois. With a 2020 population of 20,335, it is the 122nd largest city in Illinois and the 1823rd largest city in the United States. Libertyville is currently declining at a rate of -0.06% annually but its population has increased by 0.10% since the most recent census, which recorded a population of 20,315 in 2010. Libertyville reached it's highest population of 20,742 in 2000. Spanning over 9 miles, Libertyville has a population density of 2,309 people per square mile.
The average household income in Libertyville is $174,644 with a poverty rate of 3.12%. The median rental costs in recent years comes to $1,334 per month, and the median house value is $437,000. The median age in Libertyville is 44.7 years, 43.7 years for males, and 45.5 years for females. For every 100 females there are 96.2 males.