Griffith is located in Lake county Indiana with a geographic area of 7.8 square miles. The total population in Griffith is 16,198 with 50.4% male and 49.6% female. Children under age 5 represent 8.4% of the population, under age 18 equal 19.4% of the population and over age 65 is 15.0% of the population. The median household income is $67,452, per capita income is $32,209. There are a total of 6,791 housing units with 72.9% owner occupied. Education includes 41.5% of residents that are high school graduates and 17.5% with a bachelor's degree or higher. The average temperature in Griffith in the summer is 73 degrees, and in the winter 29 degrees.