Topeka is located in Mason county Illinois with a geographic area of 0.1 square miles. The total population in Topeka is 62 with 62.9% male and 37.1% female. Children under age 5 represent 3.2% of the population, under age 18 equal 12.9% of the population and over age 65 is 32.3% of the population. The median household income is $39,500, per capita income is $26,334. There are a total of 32 housing units with 78.1% owner occupied. Education includes 21.9% of residents that are high school graduates and 25.0% with a bachelor's degree or higher. The average temperature in Topeka in the summer is 74 degrees, and in the winter 27 degrees.