Stillwater is located in Washington county Minnesota with a geographic area of 8.1 square miles. The total population in Stillwater is 19,471 with 49.4% male and 50.6% female. Children under age 5 represent 4.4% of the population, under age 18 equal 22.7% of the population and over age 65 is 17.7% of the population. The median household income is $91,947, per capita income is $48,553. There are a total of 7,525 housing units with 77.0% owner occupied. Education includes 18.0% of residents that are high school graduates and 50.2% with a bachelor's degree or higher. The average temperature in Stillwater in the summer is 71 degrees, and in the winter 9 degrees.