Allen is located in Hillsdale county Michigan with a geographic area of 0.2 square miles. The total population in Allen is 277 with 51.6% male and 48.4% female. Children under age 5 represent 8.7% of the population, under age 18 equal 20.2% of the population and over age 65 is 20.9% of the population. The median household income is $44,063, per capita income is $21,368. There are a total of 111 housing units with 83.8% owner occupied. Education includes 41.4% of residents that are high school graduates and 11.7% with a bachelor's degree or higher. The average temperature in Allen in the summer is 67 degrees, and in the winter 23 degrees.