Markham is located in Cook county Illinois with a geographic area of 5.4 square miles. The total population in Markham is 12,401 with 46.6% male and 53.4% female. Children under age 5 represent 10.6% of the population, under age 18 equal 31.2% of the population and over age 65 is 13.8% of the population. The median household income is $42,050, per capita income is $19,580. There are a total of 3,832 housing units with 68.2% owner occupied. Education includes 22.4% of residents that are high school graduates and 17.5% with a bachelor's degree or higher. The average temperature in Markham in the summer is 72 degrees, and in the winter 27 degrees.
