Allegan is located in Allegan county Michigan with a geographic area of 3.8 square miles. The total population in Allegan is 5,017 with 48.8% male and 51.2% female. Children under age 5 represent 4.6% of the population, under age 18 equal 24.2% of the population and over age 65 is 13.3% of the population. The median household income is $40,284, per capita income is $19,269. There are a total of 1,773 housing units with 61.3% owner occupied. Education includes 44.9% of residents that are high school graduates and 14.9% with a bachelor's degree or higher. The average temperature in Allegan in the summer is 68 degrees, and in the winter 23 degrees.