Allendale is located in Allendale county South carolina with a geographic area of 3.3 square miles. The total population in Allendale is 2,953 with 45.5% male and 54.5% female. Children under age 5 represent 4.1% of the population, under age 18 equal 27.6% of the population and over age 65 is 21.3% of the population. The median household income is $18,680, per capita income is $13,481. There are a total of 1,224 housing units with 59.5% owner occupied. Education includes 35.5% of residents that are high school graduates and 13.6% with a bachelor's degree or higher. The average temperature in Allendale in the summer is 77 degrees, and in the winter 43 degrees.