Plattsmouth is located in Cass county Nebraska with a geographic area of 3.3 square miles. The total population in Plattsmouth is 6,453 with 48.9% male and 51.1% female. Children under age 5 represent 7.4% of the population, under age 18 equal 25.6% of the population and over age 65 is 15.2% of the population. The median household income is $50,680, per capita income is $24,744. There are a total of 2,629 housing units with 65.3% owner occupied. Education includes 33.3% of residents that are high school graduates and 15.3% with a bachelor's degree or higher. The average temperature in Plattsmouth in the summer is 72 degrees, and in the winter 26 degrees.