Slidell is located in St. tammany county Louisiana with a geographic area of 15.0 square miles. The total population in Slidell is 27,782 with 46.9% male and 53.1% female. Children under age 5 represent 5.6% of the population, under age 18 equal 24.0% of the population and over age 65 is 20.0% of the population. The median household income is $55,874, per capita income is $29,899. There are a total of 10,805 housing units with 67.0% owner occupied. Education includes 27.6% of residents that are high school graduates and 26.4% with a bachelor's degree or higher. The average temperature in Slidell in the summer is 81 degrees, and in the winter 51 degrees.
