Riverside is located in Okanogan county Washington with a geographic area of 0.9 square miles. The total population in Riverside is 396 with 49.2% male and 50.8% female. Children under age 5 represent 5.3% of the population, under age 18 equal 29.3% of the population and over age 65 is 11.6% of the population. The median household income is $33,438, per capita income is $21,550. There are a total of 182 housing units with 46.2% owner occupied. Education includes 28.6% of residents that are high school graduates and 11.5% with a bachelor's degree or higher. The average temperature in Riverside in the summer is 60 degrees, and in the winter 42 degrees.