Income Inequality in Sully County, SD was 16.09423 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Sully County, SD reached a record high of 21.79172 in January of 2020 and a record low of 9.59024 in January of 2013. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Sully County, SD - last updated from the United States Federal Reserve on May of 2024.