Franklin grove is located in Lee county Illinois with a geographic area of 0.5 square miles. The total population in Franklin grove is 948 with 48.3% male and 51.7% female. Children under age 5 represent 4.2% of the population, under age 18 equal 19.2% of the population and over age 65 is 32.8% of the population. The median household income is $46,080, per capita income is $27,341. There are a total of 403 housing units with 61.5% owner occupied. Education includes 43.9% of residents that are high school graduates and 20.6% with a bachelor's degree or higher. The average temperature in Franklin grove in the summer is 74 degrees, and in the winter 27 degrees.