Johnston is located in Edgefield county South carolina with a geographic area of 2.6 square miles. The total population in Johnston is 2,556 with 50.1% male and 49.9% female. Children under age 5 represent 3.7% of the population, under age 18 equal 21.0% of the population and over age 65 is 20.0% of the population. The median household income is $32,500, per capita income is $20,465. There are a total of 934 housing units with 52.5% owner occupied. Education includes 45.0% of residents that are high school graduates and 14.3% with a bachelor's degree or higher. The average temperature in Johnston in the summer is 77 degrees, and in the winter 43 degrees.
