Pittsburg is located in Williamson county Illinois with a geographic area of 2.1 square miles. The total population in Pittsburg is 842 with 51.7% male and 48.3% female. Children under age 5 represent 8.6% of the population, under age 18 equal 21.4% of the population and over age 65 is 21.7% of the population. The median household income is $50,114, per capita income is $21,990. There are a total of 333 housing units with 73.0% owner occupied. Education includes 42.0% of residents that are high school graduates and 15.9% with a bachelor's degree or higher. The average temperature in Pittsburg in the summer is 74 degrees, and in the winter 27 degrees.