Lake mills is located in Winnebago county Iowa with a geographic area of 2.7 square miles. The total population in Lake mills is 2,108 with 46.7% male and 53.3% female. Children under age 5 represent 3.9% of the population, under age 18 equal 22.2% of the population and over age 65 is 24.1% of the population. The median household income is $52,885, per capita income is $29,486. There are a total of 954 housing units with 66.5% owner occupied. Education includes 38.7% of residents that are high school graduates and 18.8% with a bachelor's degree or higher. The average temperature in Lake mills in the summer is 72 degrees, and in the winter 23 degrees.