Grand marsh is located in Adams county Wisconsin with a geographic area of 1.2 square miles. The total population in Grand marsh is 144 with 52.8% male and 47.2% female. Children under age 5 represent 22.2% of the population, under age 18 equal 24.3% of the population and over age 65 is 4.9% of the population. The median household income is $40,313, per capita income is $24,011. There are a total of 57 housing units with 82.5% owner occupied. Education includes 36.8% of residents that are high school graduates and 5.3% with a bachelor's degree or higher. The average temperature in Grand marsh in the summer is 66 degrees, and in the winter 17 degrees.