Millville is located in Columbia county Pennsylvania with a geographic area of 1.0 square miles. The total population in Millville is 959 with 44.4% male and 55.6% female. Children under age 5 represent 2.4% of the population, under age 18 equal 15.8% of the population and over age 65 is 24.0% of the population. The median household income is $41,964, per capita income is $22,994. There are a total of 385 housing units with 44.9% owner occupied. Education includes 50.4% of residents that are high school graduates and 17.4% with a bachelor's degree or higher. The average temperature in Millville in the summer is 73 degrees, and in the winter 33 degrees.