Allen is located in Lyon county Kansas with a geographic area of 0.3 square miles. The total population in Allen is 140 with 50.7% male and 49.3% female. Children under age 5 represent 4.3% of the population, under age 18 equal 27.1% of the population and over age 65 is 22.1% of the population. The median household income is $37,917, per capita income is $21,621. There are a total of 64 housing units with 75.0% owner occupied. Education includes 31.3% of residents that are high school graduates and 6.3% with a bachelor's degree or higher. The average temperature in Allen in the summer is 78 degrees, and in the winter 32 degrees.