Janesville is located in Bremer county Iowa with a geographic area of 1.4 square miles. The total population in Janesville is 1,051 with 51.5% male and 48.5% female. Children under age 5 represent 6.6% of the population, under age 18 equal 24.9% of the population and over age 65 is 20.3% of the population. The median household income is $72,500, per capita income is $33,945. There are a total of 442 housing units with 88.9% owner occupied. Education includes 34.8% of residents that are high school graduates and 21.0% with a bachelor's degree or higher. The average temperature in Janesville in the summer is 72 degrees, and in the winter 23 degrees.
