Carthage is a city located in South Dakota. With a 2020 population of 126, it is the 217th largest city in South Dakota and the 17874th largest city in the United States. Carthage is currently declining at a rate of -1.56% annually and its population has decreased by -12.50% since the most recent census, which recorded a population of 144 in 2010. Carthage reached it's highest population of 143 in 2010. Spanning over 1 miles, Carthage has a population density of 86 people per square mile.
The average household income in Carthage is $57,680 with a poverty rate of 9.55%. The median rental costs in recent years comes to $492 per month, and the median house value is $49,200. The median age in Carthage is 49.5 years, 46.5 years for males, and 49.8 years for females. For every 100 females there are 79.8 males.