Diehlstadt is located in Mississippi county Missouri with a geographic area of 0.1 square miles. The total population in Diehlstadt is 120 with 48.3% male and 51.7% female. Children under age 5 represent 8.3% of the population, under age 18 equal 18.3% of the population and over age 65 is 20.8% of the population. The median household income is $26,563, per capita income is $13,115. There are a total of 43 housing units with 90.7% owner occupied. Education includes 23.3% of residents that are high school graduates and 4.7% with a bachelor's degree or higher. The average temperature in Diehlstadt in the summer is 77 degrees, and in the winter 32 degrees.