Bartelso is located in Clinton county Illinois with a geographic area of 0.4 square miles. The total population in Bartelso is 789 with 47.4% male and 52.6% female. Children under age 5 represent 6.0% of the population, under age 18 equal 23.1% of the population and over age 65 is 17.2% of the population. The median household income is $82,361, per capita income is $42,470. There are a total of 325 housing units with 94.5% owner occupied. Education includes 35.4% of residents that are high school graduates and 33.2% with a bachelor's degree or higher. The average temperature in Bartelso in the summer is 74 degrees, and in the winter 27 degrees.