Clayton is located in Johnston county North carolina with a geographic area of 15.2 square miles. The total population in Clayton is 23,179 with 50.8% male and 49.2% female. Children under age 5 represent 7.7% of the population, under age 18 equal 24.0% of the population and over age 65 is 12.6% of the population. The median household income is $61,954, per capita income is $31,035. There are a total of 8,337 housing units with 64.1% owner occupied. Education includes 16.2% of residents that are high school graduates and 36.0% with a bachelor's degree or higher. The average temperature in Clayton in the summer is 75 degrees, and in the winter 38 degrees.