Pentwater is located in Oceana county Michigan with a geographic area of 1.3 square miles. The total population in Pentwater is 797 with 47.1% male and 52.9% female. Children under age 5 represent 1.5% of the population, under age 18 equal 8.2% of the population and over age 65 is 54.1% of the population. The median household income is $55,375, per capita income is $33,006. There are a total of 399 housing units with 77.9% owner occupied. Education includes 23.8% of residents that are high school graduates and 51.1% with a bachelor's degree or higher. The average temperature in Pentwater in the summer is 67 degrees, and in the winter 23 degrees.