Clay is located in Jefferson county Alabama with a geographic area of 11.0 square miles. The total population in Clay is 9,936 with 45.7% male and 54.3% female. Children under age 5 represent 6.9% of the population, under age 18 equal 26.6% of the population and over age 65 is 21.6% of the population. The median household income is $67,854, per capita income is $29,702. There are a total of 3,620 housing units with 86.8% owner occupied. Education includes 34.3% of residents that are high school graduates and 24.3% with a bachelor's degree or higher. The average temperature in Clay in the summer is 77 degrees, and in the winter 43 degrees.