Plymouth is located in Sheboygan county Wisconsin with a geographic area of 5.3 square miles. The total population in Plymouth is 8,654 with 48.8% male and 51.2% female. Children under age 5 represent 6.3% of the population, under age 18 equal 21.3% of the population and over age 65 is 22.6% of the population. The median household income is $60,492, per capita income is $31,975. There are a total of 3,972 housing units with 60.3% owner occupied. Education includes 33.5% of residents that are high school graduates and 26.8% with a bachelor's degree or higher. The average temperature in Plymouth in the summer is 68 degrees, and in the winter 17 degrees.