Decatur is located in Newton county Mississippi with a geographic area of 5.5 square miles. The total population in Decatur is 1,755 with 44.9% male and 55.1% female. Children under age 5 represent 3.1% of the population, under age 18 equal 14.0% of the population and over age 65 is 11.3% of the population. The median household income is $40,208, per capita income is $18,538. There are a total of 560 housing units with 55.2% owner occupied. Education includes 25.0% of residents that are high school graduates and 21.4% with a bachelor's degree or higher. The average temperature in Decatur in the summer is 79 degrees, and in the winter 44 degrees.