New Underwood is a city located in South Dakota. With a 2020 population of 668, it is the 95th largest city in South Dakota and the 12088th largest city in the United States. New Underwood is currently declining at a rate of -0.15% annually but its population has increased by 1.21% since the most recent census, which recorded a population of 660 in 2010. New Underwood reached it's highest population of 674 in 2013. Spanning over 1 miles, New Underwood has a population density of 600 people per square mile.
The average household income in New Underwood is $78,456 with a poverty rate of 1.76%. The median rental costs in recent years comes to $567 per month, and the median house value is $119,200. The median age in New Underwood is 37.5 years, 38.9 years for males, and 37.3 years for females. For every 100 females there are 80.9 males.