Oldenburg is a city located in Indiana. With a 2020 population of 652, it is the 376th largest city in Indiana and the 12198th largest city in the United States. Oldenburg is currently declining at a rate of -0.31% annually and its population has decreased by -3.26% since the most recent census, which recorded a population of 674 in 2010. Oldenburg reached it's highest population of 671 in 2011. Spanning over 0 miles, Oldenburg has a population density of 1,517 people per square mile.
The average household income in Oldenburg is $68,419 with a poverty rate of 19.00%. The median rental costs in recent years comes to $510 per month, and the median house value is $164,800. The median age in Oldenburg is 58.9 years, 51.7 years for males, and 66.6 years for females. For every 100 females there are 58.0 males.