Lewis county is located in Tennessee with a geographic area of 282.5 square miles. The total population in Lewis county is 12,131 with 49.3% male and 50.7% female. Children under age 5 represent 5.4% of the population, under age 18 equal 21.4% of the population and over age 65 is 21.1% of the population. The median household income is $36,977, per capita income is $21,800. There are a total of 4,837 housing units with 78.4% owner occupied. Education includes 46.2% of residents that are high school graduates and 12.7% with a bachelor's degree or higher. The average temperature in Lewis county in the summer is 76 degrees, and in the winter 40 degrees.