Earlville is located in Delaware county Iowa with a geographic area of 0.6 square miles. The total population in Earlville is 807 with 51.1% male and 48.9% female. Children under age 5 represent 8.6% of the population, under age 18 equal 23.2% of the population and over age 65 is 25.5% of the population. The median household income is $63,750, per capita income is $30,072. There are a total of 359 housing units with 89.1% owner occupied. Education includes 47.4% of residents that are high school graduates and 6.4% with a bachelor's degree or higher. The average temperature in Earlville in the summer is 70 degrees, and in the winter 23 degrees.