Oldenburg is a town in Ray Township, Franklin County, Indiana, United States.
According to the 2010 census, Oldenburg has a total area of 0.43 square miles (1.11 km2), all land.
[6] Incorporated in 1881,[7] 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.
There were 268 housing units at an average density of 623.3 per square mile (240.7/km2).
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.
34.4% of all households were made up of individuals, and 19.5% had someone living alone who was 65 years of age or older.