Sumter is located in Sumter county South carolina with a geographic area of 32.6 square miles. The total population in Sumter is 39,758 with 47.6% male and 52.4% female. Children under age 5 represent 8.4% of the population, under age 18 equal 27.0% of the population and over age 65 is 15.3% of the population. The median household income is $40,760, per capita income is $24,673. There are a total of 15,354 housing units with 50.0% owner occupied. Education includes 23.8% of residents that are high school graduates and 25.6% with a bachelor's degree or higher. The average temperature in Sumter in the summer is 79 degrees, and in the winter 43 degrees.