Petersburg is located in Lincoln county Tennessee with a geographic area of 1.0 square miles. The total population in Petersburg is 517 with 46.8% male and 53.2% female. Children under age 5 represent 5.2% of the population, under age 18 equal 20.7% of the population and over age 65 is 14.7% of the population. The median household income is $43,942, per capita income is $18,525. There are a total of 209 housing units with 61.7% owner occupied. Education includes 45.9% of residents that are high school graduates and 8.6% with a bachelor's degree or higher. The average temperature in Petersburg in the summer is 77 degrees, and in the winter 38 degrees.