Williamston is located in Anderson county South carolina with a geographic area of 3.7 square miles. The total population in Williamston is 4,219 with 46.5% male and 53.5% female. Children under age 5 represent 6.1% of the population, under age 18 equal 17.3% of the population and over age 65 is 21.1% of the population. The median household income is $57,581, per capita income is $24,943. There are a total of 1,730 housing units with 63.8% owner occupied. Education includes 43.8% of residents that are high school graduates and 15.1% with a bachelor's degree or higher. The average temperature in Williamston in the summer is 77 degrees, and in the winter 43 degrees.