Millsboro is located in Sussex county Delaware with a geographic area of 5.1 square miles. The total population in Millsboro is 4,448 with 40.3% male and 59.7% female. Children under age 5 represent 6.3% of the population, under age 18 equal 26.8% of the population and over age 65 is 25.8% of the population. The median household income is $50,931, per capita income is $27,650. There are a total of 1,754 housing units with 68.0% owner occupied. Education includes 14.5% of residents that are high school graduates and 41.2% with a bachelor's degree or higher. The average temperature in Millsboro in the summer is 74 degrees, and in the winter 35 degrees.