Wonder Lake is a city located in McHenry County Illinois. With a 2020 population of 3,858, it is the 375th largest city in Illinois and the 5513th largest city in the United States . Wonder Lake is currently declining at a rate of -0.31% annually and its population has decreased by -4.17% since the most recent census, which recorded a population of 4,026 in 2010. Wonder Lake reached it's highest population of 4,033 in 2010. Spanning over 6 miles, Wonder Lake has a population density of 799 people per square mile.
The average household income in Wonder Lake is $91,621 with a poverty rate of 12.18%. The median rental costs in recent years comes to $1,007 per month, and the median house value is $192,100. The median age in Wonder Lake is 39.2 years, 38.7 years for males, and 42.1 years for females.