Preston is located in Jackson county Iowa with a geographic area of 0.9 square miles. The total population in Preston is 1,013 with 47.9% male and 52.1% female. Children under age 5 represent 8.3% of the population, under age 18 equal 23.0% of the population and over age 65 is 17.7% of the population. The median household income is $70,556, per capita income is $26,832. There are a total of 376 housing units with 69.4% owner occupied. Education includes 42.0% of residents that are high school graduates and 17.0% with a bachelor's degree or higher. The average temperature in Preston in the summer is 71 degrees, and in the winter 23 degrees.