Deer park is located in Spokane county Washington with a geographic area of 6.9 square miles. The total population in Deer park is 4,209 with 44.0% male and 56.0% female. Children under age 5 represent 8.8% of the population, under age 18 equal 25.0% of the population and over age 65 is 18.5% of the population. The median household income is $51,864, per capita income is $27,072. There are a total of 1,796 housing units with 73.1% owner occupied. Education includes 29.0% of residents that are high school graduates and 19.8% with a bachelor's degree or higher. The average temperature in Deer park in the summer is 66 degrees, and in the winter 42 degrees.