Jansen is located in Jefferson county Nebraska with a geographic area of 0.3 square miles. The total population in Jansen is 91 with 50.5% male and 49.5% female. Children under age 5 represent 8.8% of the population, under age 18 equal 24.2% of the population and over age 65 is 25.3% of the population. The median household income is $56,250, per capita income is $64,618. There are a total of 42 housing units with 90.5% owner occupied. Education includes 57.1% of residents that are high school graduates and 9.5% with a bachelor's degree or higher. The average temperature in Jansen in the summer is 72 degrees, and in the winter 26 degrees.