Atlantic is located in Cass county Iowa with a geographic area of 8.3 square miles. The total population in Atlantic is 6,600 with 48.7% male and 51.3% female. Children under age 5 represent 4.7% of the population, under age 18 equal 19.4% of the population and over age 65 is 22.0% of the population. The median household income is $46,625, per capita income is $29,446. There are a total of 3,203 housing units with 63.4% owner occupied. Education includes 29.6% of residents that are high school graduates and 26.5% with a bachelor's degree or higher. The average temperature in Atlantic in the summer is 72 degrees, and in the winter 23 degrees.