Petersburg is located in Nelson county North dakota with a geographic area of 1.0 square miles. The total population in Petersburg is 159 with 44.0% male and 56.0% female. Children under age 5 represent 1.9% of the population, under age 18 equal 22.0% of the population and over age 65 is 21.4% of the population. The median household income is $41,875, per capita income is $26,908. There are a total of 87 housing units with 67.8% owner occupied. Education includes 13.8% of residents that are high school graduates and 27.6% with a bachelor's degree or higher. The average temperature in Petersburg in the summer is 65 degrees, and in the winter 10 degrees.