Cromwell is located in Union county Iowa with a geographic area of 0.3 square miles. The total population in Cromwell is 72 with 50.0% male and 50.0% female. Children under age 5 represent 5.6% of the population, under age 18 equal 12.5% of the population and over age 65 is 44.4% of the population. The median household income is $41,667, per capita income is $26,401. There are a total of 36 housing units with 97.2% owner occupied. Education includes 30.6% of residents that are high school graduates and 22.2% with a bachelor's degree or higher. The average temperature in Cromwell in the summer is 72 degrees, and in the winter 23 degrees.
