Petersburg is located in Huntingdon county Pennsylvania with a geographic area of 0.3 square miles. The total population in Petersburg is 379 with 49.3% male and 50.7% female. Children under age 5 represent 4.0% of the population, under age 18 equal 21.1% of the population and over age 65 is 27.4% of the population. The median household income is $42,500, per capita income is $21,996. There are a total of 152 housing units with 70.4% owner occupied. Education includes 53.9% of residents that are high school graduates and 4.6% with a bachelor's degree or higher. The average temperature in Petersburg in the summer is 73 degrees, and in the winter 33 degrees.