Barnwell is located in Barnwell county South carolina with a geographic area of 7.8 square miles. The total population in Barnwell is 4,373 with 44.5% male and 55.5% female. Children under age 5 represent 10.5% of the population, under age 18 equal 29.0% of the population and over age 65 is 14.7% of the population. The median household income is $30,750, per capita income is $17,986. There are a total of 1,660 housing units with 59.2% owner occupied. Education includes 46.5% of residents that are high school graduates and 19.0% with a bachelor's degree or higher. The average temperature in Barnwell in the summer is 79 degrees, and in the winter 43 degrees.
