Oldham is a city located in South Dakota. With a 2020 population of 114, it is the 224th largest city in South Dakota and the 18084th largest city in the United States. Oldham is currently declining at a rate of -2.56% annually and its population has decreased by -14.29% since the most recent census, which recorded a population of 133 in 2010. Oldham reached it's highest population of 135 in 2012. Spanning over 0 miles, Oldham has a population density of 464 people per square mile.
The average household income in Oldham is $42,482 with a poverty rate of 9.80%. The median rental costs in recent years comes to $567 per month, and the median house value is $31,800. The median age in Oldham is 34.1 years, 34 years for males, and 35.1 years for females. For every 100 females there are 128.4 males.