Plainwell is located in Allegan county Michigan with a geographic area of 2.0 square miles. The total population in Plainwell is 3,799 with 48.2% male and 51.8% female. Children under age 5 represent 3.2% of the population, under age 18 equal 18.5% of the population and over age 65 is 18.9% of the population. The median household income is $58,776, per capita income is $25,577. There are a total of 1,549 housing units with 75.6% owner occupied. Education includes 23.8% of residents that are high school graduates and 19.6% with a bachelor's degree or higher. The average temperature in Plainwell in the summer is 68 degrees, and in the winter 23 degrees.