London is located in Madison county Ohio with a geographic area of 8.4 square miles. The total population in London is 10,241 with 48.7% male and 51.3% female. Children under age 5 represent 6.9% of the population, under age 18 equal 22.9% of the population and over age 65 is 16.9% of the population. The median household income is $56,401, per capita income is $29,523. There are a total of 4,278 housing units with 59.1% owner occupied. Education includes 40.4% of residents that are high school graduates and 21.9% with a bachelor's degree or higher. The average temperature in London in the summer is 71 degrees, and in the winter 32 degrees.