Petersburg is located in Illinois. Petersburg, Illinois has a population of 2,324. Petersburg is less family-centric than the surrounding county with 26% households with children. The county percentage for households with children is 28%.
The median household income in Petersburg, Illinois is $56,508. The median household income for the surrounding county is $77,857 compared to the national median of $66,222. The median age of people living in Petersburg is 40.5 years.
The average high temperature in July is 87.19 degrees, with an average low temperature in January of 16.03 degrees. The annual precipitation is 34.43.