Oacoma is a city located in South Dakota. With a 2020 population of 464, it is the 123rd largest city in South Dakota and the 13660th largest city in the United States. Oacoma is currently declining at a rate of -0.64% annually but its population has increased by 2.88% since the most recent census, which recorded a population of 451 in 2010. Oacoma reached it's highest population of 478 in 2016. Spanning over 4 miles, Oacoma has a population density of 179 people per square mile.
The average household income in Oacoma is $62,342 with a poverty rate of 12.92%. The median rental costs in recent years comes to $650 per month, and the median house value is $131,300. The median age in Oacoma is 46.6 years, 53.3 years for males, and 38.9 years for females. For every 100 females there are 92.6 males.