Petersburg is a city within Washington Township and the county seat of Pike County, in the U.S. state of Indiana. The population was 2,383 at the 2010 census. Petersburg is part of the Jasper Micropolitan Statistical Area. History Petersburg was laid out in 1817. The city was named for Peter Brenton, an original owner of the town site. A post office has been in operation at Petersburg since 1823. Geography Petersburg is located at (38.491653, -87.280372). According to the 2010 census, Petersburg has a total area of , of which (or 99.73%) is land and (or 0.27%) is water. The lower portion of the White River runs through the city. Climate The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Petersburg has a humid subtropical climate, abbreviated "Cfa" on climate maps. Demographics 2010 census As the 2010 census, there were 2,383 people, 1,025 households and 592 families living in the city. The population density was . There were 1,134 housing units at an average density of . The racial makeup of the city was 97.7% White, 0.5% African American, 0.3% Native American, 0.5% Asian, 0.2% from other races, and 0.8% from two or more races. Hispanic or Latino of any race were 0.9% of the population. There were 1,025 households, of which 25.8% had children under the age of 18 living with them, 43.5% were married couples living together, 10.9% had a female householder with no husband present, 3.3% had a male householder with no wife present, and 42.2% were non-families. 37.6% of all households were made up of individuals, and 16.2% had someone living alone who was 65 years of age or older. The average household size was 2.18 and the average family size was 2.89. The median age was 43.8 years. 20% of residents were under the age of 18; 8.4% were between the ages of 18 and 24; 22.9% were from 25 to 44; 27.6% were from 45 to 64; and 21.1% were 65 years of age or older. The gender makeup was 48.6% male and 51.4% female. 2000 census At the 2000 census, there were 2,570 people, 1,092 households and 670 families living in the city. The population density was . There were 1,228 housing units at an average density of . The racial makeup was 99.07% White, 0.19% African American,