Hermiston is located in Umatilla county Oregon with a geographic area of 8.3 square miles. The total population in Hermiston is 17,512 with 48.7% male and 51.3% female. Children under age 5 represent 8.2% of the population, under age 18 equal 31.5% of the population and over age 65 is 11.5% of the population. The median household income is $58,341, per capita income is $24,693. There are a total of 6,041 housing units with 61.5% owner occupied. Education includes 18.8% of residents that are high school graduates and 15.8% with a bachelor's degree or higher. The average temperature in Hermiston in the summer is 71 degrees, and in the winter 35 degrees.