Dayton is located in Columbia county Washington with a geographic area of 1.4 square miles. The total population in Dayton is 2,620 with 50.0% male and 50.0% female. Children under age 5 represent 3.4% of the population, under age 18 equal 15.8% of the population and over age 65 is 28.7% of the population. The median household income is $58,433, per capita income is $38,832. There are a total of 1,201 housing units with 69.4% owner occupied. Education includes 22.6% of residents that are high school graduates and 18.1% with a bachelor's degree or higher. The average temperature in Dayton in the summer is 69 degrees, and in the winter 42 degrees.