Wonder lake is located in Mchenry county Illinois with a geographic area of 5.0 square miles. The total population in Wonder lake is 3,955 with 51.0% male and 49.0% female. Children under age 5 represent 6.7% of the population, under age 18 equal 29.2% of the population and over age 65 is 12.2% of the population. The median household income is $83,958, per capita income is $37,233. There are a total of 1,494 housing units with 87.0% owner occupied. Education includes 27.6% of residents that are high school graduates and 23.8% with a bachelor's degree or higher. The average temperature in Wonder lake in the summer is 74 degrees, and in the winter 27 degrees.
