Olive branch is located in Alexander county Illinois with a geographic area of 9.4 square miles. The total population in Olive branch is 610 with 43.6% male and 56.4% female. Children under age 5 represent 3.3% of the population, under age 18 equal 24.9% of the population and over age 65 is 18.7% of the population. The median household income is $46,339, per capita income is $18,653. There are a total of 217 housing units with 76.0% owner occupied. Education includes 20.3% of residents that are high school graduates and 7.8% with a bachelor's degree or higher. The average temperature in Olive branch in the summer is 74 degrees, and in the winter 27 degrees.