Portland is located in Sumner county Tennessee with a geographic area of 14.5 square miles. The total population in Portland is 12,928 with 48.3% male and 51.7% female. Children under age 5 represent 7.9% of the population, under age 18 equal 27.1% of the population and over age 65 is 10.7% of the population. The median household income is $55,777, per capita income is $22,993. There are a total of 4,654 housing units with 64.1% owner occupied. Education includes 35.2% of residents that are high school graduates and 12.9% with a bachelor's degree or higher. The average temperature in Portland in the summer is 77 degrees, and in the winter 38 degrees.