Decatur is located in Morgan county Alabama with a geographic area of 54.4 square miles. The total population in Decatur is 54,344 with 48.9% male and 51.1% female. Children under age 5 represent 6.7% of the population, under age 18 equal 23.2% of the population and over age 65 is 18.5% of the population. The median household income is $49,296, per capita income is $30,146. There are a total of 22,345 housing units with 64.4% owner occupied. Education includes 27.6% of residents that are high school graduates and 23.6% with a bachelor's degree or higher. The average temperature in Decatur in the summer is 78 degrees, and in the winter 43 degrees.