Holly grove is located in Monroe county Arkansas with a geographic area of 1.0 square miles. The total population in Holly grove is 536 with 39.7% male and 60.3% female. Children under age 5 represent 6.3% of the population, under age 18 equal 29.5% of the population and over age 65 is 11.0% of the population. The median household income is $32,500, per capita income is $20,912. There are a total of 242 housing units with 48.3% owner occupied. Education includes 41.3% of residents that are high school graduates and 13.6% with a bachelor's degree or higher. The average temperature in Holly grove in the summer is 79 degrees, and in the winter 37 degrees.