Erwin is a city located in South Dakota. With a 2020 population of 42, it is the 286th largest city in South Dakota and the 19187th largest city in the United States. Erwin is currently declining at a rate of -2.33% annually and its population has decreased by -6.67% since the most recent census, which recorded a population of 45 in 2010. Erwin reached it's highest population of 46 in 2012. Spanning over 0 miles, Erwin has a population density of 88 people per square mile.
The average household income in Erwin is $42,342 with a poverty rate of 31.71%. The median rental costs in recent years comes to - per month, and the median house value is $32,500. The median age in Erwin is 65.5 years, 68.5 years for males, and 64.5 years for females. For every 100 females there are 78.3 males.