Wailuku is located in Maui county Hawaii with a geographic area of 5.3 square miles. The total population in Wailuku is 17,523 with 49.0% male and 51.0% female. Children under age 5 represent 7.1% of the population, under age 18 equal 23.9% of the population and over age 65 is 16.5% of the population. The median household income is $76,624, per capita income is $35,385. There are a total of 6,268 housing units with 61.6% owner occupied. Education includes 27.1% of residents that are high school graduates and 32.7% with a bachelor's degree or higher. The average temperature in Wailuku in the summer is 85 degrees, and in the winter 78 degrees.