Harpers ferry is located in Allamakee county Iowa with a geographic area of 0.6 square miles. The total population in Harpers ferry is 248 with 52.0% male and 48.0% female. Children under age 5 represent 3.2% of the population, under age 18 equal 9.3% of the population and over age 65 is 54.8% of the population. The median household income is $46,875, per capita income is $28,744. There are a total of 129 housing units with 91.5% owner occupied. Education includes 47.3% of residents that are high school graduates and 16.3% with a bachelor's degree or higher. The average temperature in Harpers ferry in the summer is 72 degrees, and in the winter 23 degrees.