Onaka is a city located in South Dakota. With a 2020 population of 15, it is the 302nd largest city in South Dakota and the 19422nd largest city in the United States. Onaka is currently declining at a rate of 0.00% annually and its population has decreased by 0.00% since the most recent census, which recorded a population of 15 in 2010. Onaka reached it's highest population of 15 in 2010. Spanning over 0 miles, Onaka has a population density of 58 people per square mile.
The average household income in Onaka is $59,183 with a poverty rate of 66.67%. The median rental costs in recent years comes to - per month, and the median house value is -. The median age in Onaka is 64.5 years, 64.5 years for males, and 0 years for females. For every 100 females there are Infinity males.