Markesan is located in Green lake county Wisconsin with a geographic area of 2.3 square miles. The total population in Markesan is 1,313 with 47.0% male and 53.0% female. Children under age 5 represent 3.5% of the population, under age 18 equal 19.2% of the population and over age 65 is 27.7% of the population. The median household income is $49,015, per capita income is $24,910. There are a total of 588 housing units with 76.2% owner occupied. Education includes 37.2% of residents that are high school graduates and 12.8% with a bachelor's degree or higher. The average temperature in Markesan in the summer is 70 degrees, and in the winter 17 degrees.