Oelwein is located in Fayette county Iowa with a geographic area of 4.8 square miles. The total population in Oelwein is 5,896 with 49.3% male and 50.7% female. Children under age 5 represent 5.0% of the population, under age 18 equal 23.0% of the population and over age 65 is 22.9% of the population. The median household income is $38,320, per capita income is $23,217. There are a total of 2,478 housing units with 68.2% owner occupied. Education includes 36.7% of residents that are high school graduates and 17.6% with a bachelor's degree or higher. The average temperature in Oelwein in the summer is 70 degrees, and in the winter 23 degrees.
