Olympia is located in Thurston county Washington with a geographic area of 18.2 square miles. The total population in Olympia is 52,290 with 48.7% male and 51.3% female. Children under age 5 represent 5.8% of the population, under age 18 equal 18.0% of the population and over age 65 is 18.4% of the population. The median household income is $63,185, per capita income is $35,914. There are a total of 23,031 housing units with 47.2% owner occupied. Education includes 14.7% of residents that are high school graduates and 48.7% with a bachelor's degree or higher. The average temperature in Olympia in the summer is 61 degrees, and in the winter 42 degrees.