Gilliam is located in Saline county Missouri with a geographic area of 0.2 square miles. The total population in Gilliam is 188 with 60.6% male and 39.4% female. Children under age 5 represent 3.2% of the population, under age 18 equal 31.9% of the population and over age 65 is 6.4% of the population. The median household income is $33,125, per capita income is $21,329. There are a total of 81 housing units with 46.9% owner occupied. Education includes 33.3% of residents that are high school graduates and 2.5% with a bachelor's degree or higher. The average temperature in Gilliam in the summer is 75 degrees, and in the winter 32 degrees.