Oldenburg is a town in Ray Township, Franklin County, Indiana, United States. The population was 674 at the 2010 census. Geography Oldenburg is located at (39.339474, -85.204640). According to the 2010 census, Oldenburg has a total area of , all land. History Oldenburg was founded in 1837 by a group of German settlers. The town was named after Oldenburg, in Germany. Incorporated in 1881, Oldenburg is called the "Village of Spires" because of its churches and religious educational institutions. In 1851, Mother Theresa Hackelmeier (1827-1860) founded the Sisters of St. Francis of Oldenburg who would open numerous schools in the Midwest. The Oldenburg Historic District was listed on the National Register of Historic Places in 1983. Demographics 2010 census As of the census of 2010, there were 674 people, 235 households, and 156 families living in the town. The population density was . There were 268 housing units at an average density of . The racial makeup of the town was 98.5% White, 0.1% African American, 0.6% from other races, and 0.7% from two or more races. Hispanic or Latino of any race were 1.9% of the population. There were 235 households, of which 30.6% had children under the age of 18 living with them, 52.3% were married couples living together, 10.6% had a female householder with no husband present, 3.4% had a male householder with no wife present, and 33.6% were non-families. 29.4% of all households were made up of individuals, and 14.9% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.97. The median age in the town was 51 years. 20.6% of residents were under the age of 18; 5.8% were between the ages of 18 and 24; 17.3% were from 25 to 44; 26.7% were from 45 to 64; and 29.5% were 65 years of age or older. The gender makeup of the town was 39.3% male and 60.7% female. 2000 census As of the census of 2000, there were 647 people, 215 households, and 135 families living in the town. The population density was . There were 228 housing units at an average density of . The racial makeup of the town was 98.92% White, 0.46% Asian, and 0.62% from two or more races. Hispanic or Latino of any race were 0.15% of the population. There were 215 households, out