St. olaf is located in Clayton county Iowa with a geographic area of 0.2 square miles. The total population in St. olaf is 128 with 56.3% male and 43.8% female. Children under age 5 represent 11.7% of the population, under age 18 equal 34.4% of the population and over age 65 is 7.0% of the population. The median household income is $63,750, per capita income is $26,781. There are a total of 44 housing units with 65.9% owner occupied. Education includes 54.5% of residents that are high school graduates and 13.6% with a bachelor's degree or higher. The average temperature in St. olaf in the summer is 72 degrees, and in the winter 23 degrees.