Dongola is located in Union county Illinois with a geographic area of 1.1 square miles. The total population in Dongola is 654 with 49.5% male and 50.5% female. Children under age 5 represent 8.6% of the population, under age 18 equal 26.0% of the population and over age 65 is 18.0% of the population. The median household income is $34,073, per capita income is $18,439. There are a total of 255 housing units with 66.7% owner occupied. Education includes 33.3% of residents that are high school graduates and 5.9% with a bachelor's degree or higher. The average temperature in Dongola in the summer is 74 degrees, and in the winter 27 degrees.